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authorVincent Ambo <mail@tazj.in>2022-02-07T23·05+0300
committerclbot <clbot@tvl.fyi>2022-02-07T23·09+0000
commit5aa5d282eac56a21e74611c1cdbaa97bb5db2dca (patch)
tree8cc5dce8157a1470ff76719dd15d65f648a05522 /third_party/abseil_cpp/absl/random/internal
parenta25675804c4f429fab5ee5201fe25e89865dfd13 (diff)
chore(3p/abseil_cpp): unvendor abseil_cpp r/3786
we weren't actually using these sources anymore, okay?

Change-Id: If701571d9716de308d3512e1eb22c35db0877a66
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5248
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: tazjin <tazjin@tvl.su>
Diffstat (limited to 'third_party/abseil_cpp/absl/random/internal')
-rw-r--r--third_party/abseil_cpp/absl/random/internal/BUILD.bazel730
-rw-r--r--third_party/abseil_cpp/absl/random/internal/chi_square.cc232
-rw-r--r--third_party/abseil_cpp/absl/random/internal/chi_square.h89
-rw-r--r--third_party/abseil_cpp/absl/random/internal/chi_square_test.cc365
-rw-r--r--third_party/abseil_cpp/absl/random/internal/distribution_caller.h92
-rw-r--r--third_party/abseil_cpp/absl/random/internal/distribution_test_util.cc418
-rw-r--r--third_party/abseil_cpp/absl/random/internal/distribution_test_util.h113
-rw-r--r--third_party/abseil_cpp/absl/random/internal/distribution_test_util_test.cc193
-rw-r--r--third_party/abseil_cpp/absl/random/internal/explicit_seed_seq.h91
-rw-r--r--third_party/abseil_cpp/absl/random/internal/explicit_seed_seq_test.cc204
-rw-r--r--third_party/abseil_cpp/absl/random/internal/fast_uniform_bits.h268
-rw-r--r--third_party/abseil_cpp/absl/random/internal/fast_uniform_bits_test.cc336
-rw-r--r--third_party/abseil_cpp/absl/random/internal/fastmath.h74
-rw-r--r--third_party/abseil_cpp/absl/random/internal/fastmath_test.cc110
-rw-r--r--third_party/abseil_cpp/absl/random/internal/gaussian_distribution_gentables.cc143
-rw-r--r--third_party/abseil_cpp/absl/random/internal/generate_real.h146
-rw-r--r--third_party/abseil_cpp/absl/random/internal/generate_real_test.cc497
-rw-r--r--third_party/abseil_cpp/absl/random/internal/iostream_state_saver.h245
-rw-r--r--third_party/abseil_cpp/absl/random/internal/iostream_state_saver_test.cc371
-rw-r--r--third_party/abseil_cpp/absl/random/internal/mock_helpers.h127
-rw-r--r--third_party/abseil_cpp/absl/random/internal/mock_overload_set.h97
-rw-r--r--third_party/abseil_cpp/absl/random/internal/nanobenchmark.cc804
-rw-r--r--third_party/abseil_cpp/absl/random/internal/nanobenchmark.h172
-rw-r--r--third_party/abseil_cpp/absl/random/internal/nanobenchmark_test.cc77
-rw-r--r--third_party/abseil_cpp/absl/random/internal/nonsecure_base.h150
-rw-r--r--third_party/abseil_cpp/absl/random/internal/nonsecure_base_test.cc245
-rw-r--r--third_party/abseil_cpp/absl/random/internal/pcg_engine.h307
-rw-r--r--third_party/abseil_cpp/absl/random/internal/pcg_engine_test.cc638
-rw-r--r--third_party/abseil_cpp/absl/random/internal/platform.h171
-rw-r--r--third_party/abseil_cpp/absl/random/internal/pool_urbg.cc254
-rw-r--r--third_party/abseil_cpp/absl/random/internal/pool_urbg.h131
-rw-r--r--third_party/abseil_cpp/absl/random/internal/pool_urbg_test.cc182
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen.cc91
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen.h102
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc174
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_detect.cc221
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_detect.h33
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_engine.h230
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_engine_test.cc656
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_hwaes.cc573
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_hwaes.h50
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_hwaes_test.cc104
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_round_keys.cc462
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_slow.cc457
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_slow.h40
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_slow_test.cc63
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_test.cc70
-rw-r--r--third_party/abseil_cpp/absl/random/internal/randen_traits.h88
-rw-r--r--third_party/abseil_cpp/absl/random/internal/salted_seed_seq.h167
-rw-r--r--third_party/abseil_cpp/absl/random/internal/salted_seed_seq_test.cc168
-rw-r--r--third_party/abseil_cpp/absl/random/internal/seed_material.cc219
-rw-r--r--third_party/abseil_cpp/absl/random/internal/seed_material.h104
-rw-r--r--third_party/abseil_cpp/absl/random/internal/seed_material_test.cc202
-rw-r--r--third_party/abseil_cpp/absl/random/internal/sequence_urbg.h60
-rw-r--r--third_party/abseil_cpp/absl/random/internal/traits.h101
-rw-r--r--third_party/abseil_cpp/absl/random/internal/traits_test.cc126
-rw-r--r--third_party/abseil_cpp/absl/random/internal/uniform_helper.h244
-rw-r--r--third_party/abseil_cpp/absl/random/internal/uniform_helper_test.cc279
-rw-r--r--third_party/abseil_cpp/absl/random/internal/wide_multiply.h111
-rw-r--r--third_party/abseil_cpp/absl/random/internal/wide_multiply_test.cc66
60 files changed, 0 insertions, 13333 deletions
diff --git a/third_party/abseil_cpp/absl/random/internal/BUILD.bazel b/third_party/abseil_cpp/absl/random/internal/BUILD.bazel
deleted file mode 100644
index 8485e28b010b..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/BUILD.bazel
+++ /dev/null
@@ -1,730 +0,0 @@
-#
-# Copyright 2019 The Abseil Authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
-
-# Internal-only implementation classes for Abseil Random
-load(
-    "//absl:copts/configure_copts.bzl",
-    "ABSL_DEFAULT_COPTS",
-    "ABSL_DEFAULT_LINKOPTS",
-    "ABSL_RANDOM_RANDEN_COPTS",
-    "ABSL_TEST_COPTS",
-    "absl_random_randen_copts_init",
-)
-
-package(default_visibility = [
-    "//absl/random:__pkg__",
-])
-
-licenses(["notice"])
-
-cc_library(
-    name = "traits",
-    hdrs = ["traits.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = ["//absl/base:config"],
-)
-
-cc_library(
-    name = "distribution_caller",
-    hdrs = ["distribution_caller.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        "//absl/base:config",
-        "//absl/base:fast_type_id",
-        "//absl/utility",
-    ],
-)
-
-cc_library(
-    name = "fast_uniform_bits",
-    hdrs = [
-        "fast_uniform_bits.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        "//absl/base:config",
-        "//absl/meta:type_traits",
-    ],
-)
-
-cc_library(
-    name = "seed_material",
-    srcs = [
-        "seed_material.cc",
-    ],
-    hdrs = [
-        "seed_material.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS + select({
-        "//absl:windows": ["-DEFAULTLIB:bcrypt.lib"],
-        "//conditions:default": [],
-    }),
-    deps = [
-        ":fast_uniform_bits",
-        "//absl/base:core_headers",
-        "//absl/base:raw_logging_internal",
-        "//absl/strings",
-        "//absl/types:optional",
-        "//absl/types:span",
-    ],
-)
-
-cc_library(
-    name = "pool_urbg",
-    srcs = [
-        "pool_urbg.cc",
-    ],
-    hdrs = [
-        "pool_urbg.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = select({
-        "//absl:windows": [],
-        "//absl:wasm": [],
-        "//conditions:default": ["-pthread"],
-    }) + ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":randen",
-        ":seed_material",
-        ":traits",
-        "//absl/base",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/base:endian",
-        "//absl/base:raw_logging_internal",
-        "//absl/random:seed_gen_exception",
-        "//absl/types:span",
-    ],
-)
-
-cc_library(
-    name = "explicit_seed_seq",
-    testonly = 1,
-    hdrs = [
-        "explicit_seed_seq.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = ["//absl/base:config"],
-)
-
-cc_library(
-    name = "sequence_urbg",
-    testonly = 1,
-    hdrs = [
-        "sequence_urbg.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = ["//absl/base:config"],
-)
-
-cc_library(
-    name = "salted_seed_seq",
-    hdrs = [
-        "salted_seed_seq.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":seed_material",
-        "//absl/container:inlined_vector",
-        "//absl/meta:type_traits",
-        "//absl/types:optional",
-        "//absl/types:span",
-    ],
-)
-
-cc_library(
-    name = "iostream_state_saver",
-    hdrs = ["iostream_state_saver.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        "//absl/meta:type_traits",
-        "//absl/numeric:int128",
-    ],
-)
-
-cc_library(
-    name = "generate_real",
-    hdrs = [
-        "generate_real.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":fastmath",
-        ":traits",
-        "//absl/base:bits",
-        "//absl/meta:type_traits",
-    ],
-)
-
-cc_library(
-    name = "fastmath",
-    hdrs = [
-        "fastmath.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = ["//absl/base:bits"],
-)
-
-cc_library(
-    name = "wide_multiply",
-    hdrs = ["wide_multiply.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":traits",
-        "//absl/base:bits",
-        "//absl/base:config",
-        "//absl/numeric:int128",
-    ],
-)
-
-cc_library(
-    name = "nonsecure_base",
-    hdrs = ["nonsecure_base.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":pool_urbg",
-        ":salted_seed_seq",
-        ":seed_material",
-        "//absl/base:core_headers",
-        "//absl/meta:type_traits",
-        "//absl/types:optional",
-        "//absl/types:span",
-    ],
-)
-
-cc_library(
-    name = "pcg_engine",
-    hdrs = ["pcg_engine.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":fastmath",
-        ":iostream_state_saver",
-        "//absl/base:config",
-        "//absl/meta:type_traits",
-        "//absl/numeric:int128",
-    ],
-)
-
-cc_library(
-    name = "randen_engine",
-    hdrs = ["randen_engine.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":iostream_state_saver",
-        ":randen",
-        "//absl/meta:type_traits",
-    ],
-)
-
-cc_library(
-    name = "platform",
-    srcs = [
-        "randen_round_keys.cc",
-    ],
-    hdrs = [
-        "randen_traits.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    textual_hdrs = [
-        "platform.h",
-    ],
-    deps = ["//absl/base:config"],
-)
-
-cc_library(
-    name = "randen",
-    srcs = [
-        "randen.cc",
-    ],
-    hdrs = [
-        "randen.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":platform",
-        ":randen_hwaes",
-        ":randen_slow",
-        "//absl/base:raw_logging_internal",
-    ],
-)
-
-cc_library(
-    name = "randen_slow",
-    srcs = ["randen_slow.cc"],
-    hdrs = ["randen_slow.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":platform",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-    ],
-)
-
-absl_random_randen_copts_init()
-
-cc_library(
-    name = "randen_hwaes",
-    srcs = [
-        "randen_detect.cc",
-    ],
-    hdrs = [
-        "randen_detect.h",
-        "randen_hwaes.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":platform",
-        ":randen_hwaes_impl",
-        "//absl/base:config",
-    ],
-)
-
-# build with --save_temps to see assembly language output.
-cc_library(
-    name = "randen_hwaes_impl",
-    srcs = [
-        "randen_hwaes.cc",
-        "randen_hwaes.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS + ABSL_RANDOM_RANDEN_COPTS + select({
-        "//absl:windows": [],
-        "//conditions:default": ["-Wno-pass-failed"],
-    }),
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":platform",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-    ],
-)
-
-cc_binary(
-    name = "gaussian_distribution_gentables",
-    srcs = [
-        "gaussian_distribution_gentables.cc",
-    ],
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        "//absl/base:core_headers",
-        "//absl/random:distributions",
-    ],
-)
-
-cc_library(
-    name = "distribution_test_util",
-    testonly = 1,
-    srcs = [
-        "chi_square.cc",
-        "distribution_test_util.cc",
-    ],
-    hdrs = [
-        "chi_square.h",
-        "distribution_test_util.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/base:raw_logging_internal",
-        "//absl/strings",
-        "//absl/strings:str_format",
-        "//absl/types:span",
-    ],
-)
-
-# Common tags for tests, etc.
-ABSL_RANDOM_NONPORTABLE_TAGS = [
-    "no_test_android_arm",
-    "no_test_android_arm64",
-    "no_test_android_x86",
-    "no_test_darwin_x86_64",
-    "no_test_ios_x86_64",
-    "no_test_loonix",
-    "no_test_msvc_x64",
-    "no_test_wasm",
-]
-
-cc_test(
-    name = "traits_test",
-    size = "small",
-    srcs = ["traits_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":traits",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "generate_real_test",
-    size = "small",
-    srcs = [
-        "generate_real_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":generate_real",
-        "//absl/base:bits",
-        "//absl/flags:flag",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "distribution_test_util_test",
-    size = "small",
-    srcs = ["distribution_test_util_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":distribution_test_util",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "fastmath_test",
-    size = "small",
-    srcs = ["fastmath_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":fastmath",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "explicit_seed_seq_test",
-    size = "small",
-    srcs = ["explicit_seed_seq_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":explicit_seed_seq",
-        "//absl/random:seed_sequences",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "salted_seed_seq_test",
-    size = "small",
-    srcs = ["salted_seed_seq_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":salted_seed_seq",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "chi_square_test",
-    size = "small",
-    srcs = [
-        "chi_square_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":distribution_test_util",
-        "//absl/base:core_headers",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "fast_uniform_bits_test",
-    size = "small",
-    srcs = [
-        "fast_uniform_bits_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":fast_uniform_bits",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_library(
-    name = "mock_helpers",
-    hdrs = ["mock_helpers.h"],
-    deps = [
-        "//absl/base:fast_type_id",
-        "//absl/types:optional",
-    ],
-)
-
-cc_library(
-    name = "mock_overload_set",
-    testonly = 1,
-    hdrs = ["mock_overload_set.h"],
-    deps = [
-        ":mock_helpers",
-        "//absl/random:mocking_bit_gen",
-        "@com_google_googletest//:gtest",
-    ],
-)
-
-cc_test(
-    name = "nonsecure_base_test",
-    size = "small",
-    srcs = [
-        "nonsecure_base_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":nonsecure_base",
-        "//absl/random",
-        "//absl/random:distributions",
-        "//absl/random:seed_sequences",
-        "//absl/strings",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "seed_material_test",
-    size = "small",
-    srcs = ["seed_material_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":seed_material",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "pool_urbg_test",
-    size = "small",
-    srcs = [
-        "pool_urbg_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":pool_urbg",
-        "//absl/meta:type_traits",
-        "//absl/types:span",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "pcg_engine_test",
-    size = "medium",  # Trying to measure accuracy.
-    srcs = ["pcg_engine_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    flaky = 1,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":explicit_seed_seq",
-        ":pcg_engine",
-        "//absl/time",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "randen_engine_test",
-    size = "medium",
-    srcs = [
-        "randen_engine_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":explicit_seed_seq",
-        ":randen_engine",
-        "//absl/base:raw_logging_internal",
-        "//absl/strings",
-        "//absl/time",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "randen_test",
-    size = "small",
-    srcs = ["randen_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":randen",
-        "//absl/meta:type_traits",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "randen_slow_test",
-    size = "small",
-    srcs = ["randen_slow_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":platform",
-        ":randen_slow",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "randen_hwaes_test",
-    size = "small",
-    srcs = ["randen_hwaes_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    tags = ABSL_RANDOM_NONPORTABLE_TAGS,
-    deps = [
-        ":platform",
-        ":randen_hwaes",
-        ":randen_hwaes_impl",  # build_cleaner: keep
-        "//absl/base:raw_logging_internal",
-        "//absl/strings:str_format",
-        "@com_google_googletest//:gtest",
-    ],
-)
-
-cc_test(
-    name = "wide_multiply_test",
-    size = "small",
-    srcs = ["wide_multiply_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":wide_multiply",
-        "//absl/base:bits",
-        "//absl/numeric:int128",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_library(
-    name = "nanobenchmark",
-    srcs = ["nanobenchmark.cc"],
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    textual_hdrs = ["nanobenchmark.h"],
-    deps = [
-        ":platform",
-        ":randen_engine",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/base:raw_logging_internal",
-    ],
-)
-
-cc_library(
-    name = "uniform_helper",
-    hdrs = ["uniform_helper.h"],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":traits",
-        "//absl/base:config",
-        "//absl/meta:type_traits",
-    ],
-)
-
-cc_test(
-    name = "nanobenchmark_test",
-    size = "small",
-    srcs = ["nanobenchmark_test.cc"],
-    flaky = 1,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    tags = [
-        "benchmark",
-        "no_test_ios_x86_64",
-        "no_test_loonix",  # Crashing.
-    ],
-    deps = [
-        ":nanobenchmark",
-        "//absl/base:raw_logging_internal",
-        "//absl/strings",
-    ],
-)
-
-cc_test(
-    name = "randen_benchmarks",
-    size = "medium",
-    timeout = "long",
-    srcs = ["randen_benchmarks.cc"],
-    copts = ABSL_TEST_COPTS + ABSL_RANDOM_RANDEN_COPTS,
-    flaky = 1,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    tags = ABSL_RANDOM_NONPORTABLE_TAGS + ["benchmark"],
-    deps = [
-        ":nanobenchmark",
-        ":platform",
-        ":randen",
-        ":randen_engine",
-        ":randen_hwaes",
-        ":randen_hwaes_impl",
-        ":randen_slow",
-        "//absl/base:raw_logging_internal",
-        "//absl/strings",
-    ],
-)
-
-cc_test(
-    name = "iostream_state_saver_test",
-    size = "small",
-    srcs = ["iostream_state_saver_test.cc"],
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":iostream_state_saver",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "uniform_helper_test",
-    size = "small",
-    srcs = ["uniform_helper_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":uniform_helper",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
diff --git a/third_party/abseil_cpp/absl/random/internal/chi_square.cc b/third_party/abseil_cpp/absl/random/internal/chi_square.cc
deleted file mode 100644
index 640d48cea6f4..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/chi_square.cc
+++ /dev/null
@@ -1,232 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/chi_square.h"
-
-#include <cmath>
-
-#include "absl/random/internal/distribution_test_util.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-
-#if defined(__EMSCRIPTEN__)
-// Workaround __EMSCRIPTEN__ error: llvm_fma_f64 not found.
-inline double fma(double x, double y, double z) {
-  return (x * y) + z;
-}
-#endif
-
-// Use Horner's method to evaluate a polynomial.
-template <typename T, unsigned N>
-inline T EvaluatePolynomial(T x, const T (&poly)[N]) {
-#if !defined(__EMSCRIPTEN__)
-  using std::fma;
-#endif
-  T p = poly[N - 1];
-  for (unsigned i = 2; i <= N; i++) {
-    p = fma(p, x, poly[N - i]);
-  }
-  return p;
-}
-
-static constexpr int kLargeDOF = 150;
-
-// Returns the probability of a normal z-value.
-//
-// Adapted from the POZ function in:
-//     Ibbetson D, Algorithm 209
-//     Collected Algorithms of the CACM 1963 p. 616
-//
-double POZ(double z) {
-  static constexpr double kP1[] = {
-      0.797884560593,  -0.531923007300, 0.319152932694,
-      -0.151968751364, 0.059054035642,  -0.019198292004,
-      0.005198775019,  -0.001075204047, 0.000124818987,
-  };
-  static constexpr double kP2[] = {
-      0.999936657524,  0.000535310849,  -0.002141268741, 0.005353579108,
-      -0.009279453341, 0.011630447319,  -0.010557625006, 0.006549791214,
-      -0.002034254874, -0.000794620820, 0.001390604284,  -0.000676904986,
-      -0.000019538132, 0.000152529290,  -0.000045255659,
-  };
-
-  const double kZMax = 6.0;  // Maximum meaningful z-value.
-  if (z == 0.0) {
-    return 0.5;
-  }
-  double x;
-  double y = 0.5 * std::fabs(z);
-  if (y >= (kZMax * 0.5)) {
-    x = 1.0;
-  } else if (y < 1.0) {
-    double w = y * y;
-    x = EvaluatePolynomial(w, kP1) * y * 2.0;
-  } else {
-    y -= 2.0;
-    x = EvaluatePolynomial(y, kP2);
-  }
-  return z > 0.0 ? ((x + 1.0) * 0.5) : ((1.0 - x) * 0.5);
-}
-
-// Approximates the survival function of the normal distribution.
-//
-// Algorithm 26.2.18, from:
-// [Abramowitz and Stegun, Handbook of Mathematical Functions,p.932]
-// http://people.math.sfu.ca/~cbm/aands/abramowitz_and_stegun.pdf
-//
-double normal_survival(double z) {
-  // Maybe replace with the alternate formulation.
-  // 0.5 * erfc((x - mean)/(sqrt(2) * sigma))
-  static constexpr double kR[] = {
-      1.0, 0.196854, 0.115194, 0.000344, 0.019527,
-  };
-  double r = EvaluatePolynomial(z, kR);
-  r *= r;
-  return 0.5 / (r * r);
-}
-
-}  // namespace
-
-// Calculates the critical chi-square value given degrees-of-freedom and a
-// p-value, usually using bisection. Also known by the name CRITCHI.
-double ChiSquareValue(int dof, double p) {
-  static constexpr double kChiEpsilon =
-      0.000001;  // Accuracy of the approximation.
-  static constexpr double kChiMax =
-      99999.0;  // Maximum chi-squared value.
-
-  const double p_value = 1.0 - p;
-  if (dof < 1 || p_value > 1.0) {
-    return 0.0;
-  }
-
-  if (dof > kLargeDOF) {
-    // For large degrees of freedom, use the normal approximation by
-    //     Wilson, E. B. and Hilferty, M. M. (1931)
-    //                     chi^2 - mean
-    //                Z = --------------
-    //                        stddev
-    const double z = InverseNormalSurvival(p_value);
-    const double mean = 1 - 2.0 / (9 * dof);
-    const double variance = 2.0 / (9 * dof);
-    // Cannot use this method if the variance is 0.
-    if (variance != 0) {
-      return std::pow(z * std::sqrt(variance) + mean, 3.0) * dof;
-    }
-  }
-
-  if (p_value <= 0.0) return kChiMax;
-
-  // Otherwise search for the p value by bisection
-  double min_chisq = 0.0;
-  double max_chisq = kChiMax;
-  double current = dof / std::sqrt(p_value);
-  while ((max_chisq - min_chisq) > kChiEpsilon) {
-    if (ChiSquarePValue(current, dof) < p_value) {
-      max_chisq = current;
-    } else {
-      min_chisq = current;
-    }
-    current = (max_chisq + min_chisq) * 0.5;
-  }
-  return current;
-}
-
-// Calculates the p-value (probability) of a given chi-square value
-// and degrees of freedom.
-//
-// Adapted from the POCHISQ function from:
-//     Hill, I. D. and Pike, M. C.  Algorithm 299
-//     Collected Algorithms of the CACM 1963 p. 243
-//
-double ChiSquarePValue(double chi_square, int dof) {
-  static constexpr double kLogSqrtPi =
-      0.5723649429247000870717135;  // Log[Sqrt[Pi]]
-  static constexpr double kInverseSqrtPi =
-      0.5641895835477562869480795;  // 1/(Sqrt[Pi])
-
-  // For large degrees of freedom, use the normal approximation by
-  //     Wilson, E. B. and Hilferty, M. M. (1931)
-  // Via Wikipedia:
-  //   By the Central Limit Theorem, because the chi-square distribution is the
-  //   sum of k independent random variables with finite mean and variance, it
-  //   converges to a normal distribution for large k.
-  if (dof > kLargeDOF) {
-    // Re-scale everything.
-    const double chi_square_scaled = std::pow(chi_square / dof, 1.0 / 3);
-    const double mean = 1 - 2.0 / (9 * dof);
-    const double variance = 2.0 / (9 * dof);
-    // If variance is 0, this method cannot be used.
-    if (variance != 0) {
-      const double z = (chi_square_scaled - mean) / std::sqrt(variance);
-      if (z > 0) {
-        return normal_survival(z);
-      } else if (z < 0) {
-        return 1.0 - normal_survival(-z);
-      } else {
-        return 0.5;
-      }
-    }
-  }
-
-  // The chi square function is >= 0 for any degrees of freedom.
-  // In other words, probability that the chi square function >= 0 is 1.
-  if (chi_square <= 0.0) return 1.0;
-
-  // If the degrees of freedom is zero, the chi square function is always 0 by
-  // definition. In other words, the probability that the chi square function
-  // is > 0 is zero (chi square values <= 0 have been filtered above).
-  if (dof < 1) return 0;
-
-  auto capped_exp = [](double x) { return x < -20 ? 0.0 : std::exp(x); };
-  static constexpr double kBigX = 20;
-
-  double a = 0.5 * chi_square;
-  const bool even = !(dof & 1);  // True if dof is an even number.
-  const double y = capped_exp(-a);
-  double s = even ? y : (2.0 * POZ(-std::sqrt(chi_square)));
-
-  if (dof <= 2) {
-    return s;
-  }
-
-  chi_square = 0.5 * (dof - 1.0);
-  double z = (even ? 1.0 : 0.5);
-  if (a > kBigX) {
-    double e = (even ? 0.0 : kLogSqrtPi);
-    double c = std::log(a);
-    while (z <= chi_square) {
-      e = std::log(z) + e;
-      s += capped_exp(c * z - a - e);
-      z += 1.0;
-    }
-    return s;
-  }
-
-  double e = (even ? 1.0 : (kInverseSqrtPi / std::sqrt(a)));
-  double c = 0.0;
-  while (z <= chi_square) {
-    e = e * (a / z);
-    c = c + e;
-    z += 1.0;
-  }
-  return c * y + s;
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/chi_square.h b/third_party/abseil_cpp/absl/random/internal/chi_square.h
deleted file mode 100644
index 07f4fbe52298..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/chi_square.h
+++ /dev/null
@@ -1,89 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_CHI_SQUARE_H_
-#define ABSL_RANDOM_INTERNAL_CHI_SQUARE_H_
-
-// The chi-square statistic.
-//
-// Useful for evaluating if `D` independent random variables are behaving as
-// expected, or if two distributions are similar.  (`D` is the degrees of
-// freedom).
-//
-// Each bucket should have an expected count of 10 or more for the chi square to
-// be meaningful.
-
-#include <cassert>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-constexpr const char kChiSquared[] = "chi-squared";
-
-// Returns the measured chi square value, using a single expected value.  This
-// assumes that the values in [begin, end) are uniformly distributed.
-template <typename Iterator>
-double ChiSquareWithExpected(Iterator begin, Iterator end, double expected) {
-  // Compute the sum and the number of buckets.
-  assert(expected >= 10);  // require at least 10 samples per bucket.
-  double chi_square = 0;
-  for (auto it = begin; it != end; it++) {
-    double d = static_cast<double>(*it) - expected;
-    chi_square += d * d;
-  }
-  chi_square = chi_square / expected;
-  return chi_square;
-}
-
-// Returns the measured chi square value, taking the actual value of each bucket
-// from the first set of iterators, and the expected value of each bucket from
-// the second set of iterators.
-template <typename Iterator, typename Expected>
-double ChiSquare(Iterator it, Iterator end, Expected eit, Expected eend) {
-  double chi_square = 0;
-  for (; it != end && eit != eend; ++it, ++eit) {
-    if (*it > 0) {
-      assert(*eit > 0);
-    }
-    double e = static_cast<double>(*eit);
-    double d = static_cast<double>(*it - *eit);
-    if (d != 0) {
-      assert(e > 0);
-      chi_square += (d * d) / e;
-    }
-  }
-  assert(it == end && eit == eend);
-  return chi_square;
-}
-
-// ======================================================================
-// The following methods can be used for an arbitrary significance level.
-//
-
-// Calculates critical chi-square values to produce the given p-value using a
-// bisection search for a value within epsilon, relying on the monotonicity of
-// ChiSquarePValue().
-double ChiSquareValue(int dof, double p);
-
-// Calculates the p-value (probability) of a given chi-square value.
-double ChiSquarePValue(double chi_square, int dof);
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_CHI_SQUARE_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/chi_square_test.cc b/third_party/abseil_cpp/absl/random/internal/chi_square_test.cc
deleted file mode 100644
index 5025defac12c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/chi_square_test.cc
+++ /dev/null
@@ -1,365 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/chi_square.h"
-
-#include <algorithm>
-#include <cstddef>
-#include <cstdint>
-#include <iterator>
-#include <numeric>
-#include <vector>
-
-#include "gtest/gtest.h"
-#include "absl/base/macros.h"
-
-using absl::random_internal::ChiSquare;
-using absl::random_internal::ChiSquarePValue;
-using absl::random_internal::ChiSquareValue;
-using absl::random_internal::ChiSquareWithExpected;
-
-namespace {
-
-TEST(ChiSquare, Value) {
-  struct {
-    int line;
-    double chi_square;
-    int df;
-    double confidence;
-  } const specs[] = {
-      // Testing lookup at 1% confidence
-      {__LINE__, 0, 0, 0.01},
-      {__LINE__, 0.00016, 1, 0.01},
-      {__LINE__, 1.64650, 8, 0.01},
-      {__LINE__, 5.81221, 16, 0.01},
-      {__LINE__, 156.4319, 200, 0.01},
-      {__LINE__, 1121.3784, 1234, 0.01},
-      {__LINE__, 53557.1629, 54321, 0.01},
-      {__LINE__, 651662.6647, 654321, 0.01},
-
-      // Testing lookup at 99% confidence
-      {__LINE__, 0, 0, 0.99},
-      {__LINE__, 6.635, 1, 0.99},
-      {__LINE__, 20.090, 8, 0.99},
-      {__LINE__, 32.000, 16, 0.99},
-      {__LINE__, 249.4456, 200, 0.99},
-      {__LINE__, 1131.1573, 1023, 0.99},
-      {__LINE__, 1352.5038, 1234, 0.99},
-      {__LINE__, 55090.7356, 54321, 0.99},
-      {__LINE__, 656985.1514, 654321, 0.99},
-
-      // Testing lookup at 99.9% confidence
-      {__LINE__, 16.2659, 3, 0.999},
-      {__LINE__, 22.4580, 6, 0.999},
-      {__LINE__, 267.5409, 200, 0.999},
-      {__LINE__, 1168.5033, 1023, 0.999},
-      {__LINE__, 55345.1741, 54321, 0.999},
-      {__LINE__, 657861.7284, 654321, 0.999},
-      {__LINE__, 51.1772, 24, 0.999},
-      {__LINE__, 59.7003, 30, 0.999},
-      {__LINE__, 37.6984, 15, 0.999},
-      {__LINE__, 29.5898, 10, 0.999},
-      {__LINE__, 27.8776, 9, 0.999},
-
-      // Testing lookup at random confidences
-      {__LINE__, 0.000157088, 1, 0.01},
-      {__LINE__, 5.31852, 2, 0.93},
-      {__LINE__, 1.92256, 4, 0.25},
-      {__LINE__, 10.7709, 13, 0.37},
-      {__LINE__, 26.2514, 17, 0.93},
-      {__LINE__, 36.4799, 29, 0.84},
-      {__LINE__, 25.818, 31, 0.27},
-      {__LINE__, 63.3346, 64, 0.50},
-      {__LINE__, 196.211, 128, 0.9999},
-      {__LINE__, 215.21, 243, 0.10},
-      {__LINE__, 285.393, 256, 0.90},
-      {__LINE__, 984.504, 1024, 0.1923},
-      {__LINE__, 2043.85, 2048, 0.4783},
-      {__LINE__, 48004.6, 48273, 0.194},
-  };
-  for (const auto& spec : specs) {
-    SCOPED_TRACE(spec.line);
-    // Verify all values are have at most a 1% relative error.
-    const double val = ChiSquareValue(spec.df, spec.confidence);
-    const double err = std::max(5e-6, spec.chi_square / 5e3);  // 1 part in 5000
-    EXPECT_NEAR(spec.chi_square, val, err) << spec.line;
-  }
-
-  // Relaxed test for extreme values, from
-  //  http://www.ciphersbyritter.com/JAVASCRP/NORMCHIK.HTM#ChiSquare
-  EXPECT_NEAR(49.2680, ChiSquareValue(100, 1e-6), 5);  // 0.000'005 mark
-  EXPECT_NEAR(123.499, ChiSquareValue(200, 1e-6), 5);  // 0.000'005 mark
-
-  EXPECT_NEAR(149.449, ChiSquareValue(100, 0.999), 0.01);
-  EXPECT_NEAR(161.318, ChiSquareValue(100, 0.9999), 0.01);
-  EXPECT_NEAR(172.098, ChiSquareValue(100, 0.99999), 0.01);
-
-  EXPECT_NEAR(381.426, ChiSquareValue(300, 0.999), 0.05);
-  EXPECT_NEAR(399.756, ChiSquareValue(300, 0.9999), 0.1);
-  EXPECT_NEAR(416.126, ChiSquareValue(300, 0.99999), 0.2);
-}
-
-TEST(ChiSquareTest, PValue) {
-  struct {
-    int line;
-    double pval;
-    double chi_square;
-    int df;
-  } static const specs[] = {
-      {__LINE__, 1, 0, 0},
-      {__LINE__, 0, 0.001, 0},
-      {__LINE__, 1.000, 0, 453},
-      {__LINE__, 0.134471, 7972.52, 7834},
-      {__LINE__, 0.203922, 28.32, 23},
-      {__LINE__, 0.737171, 48274, 48472},
-      {__LINE__, 0.444146, 583.1234, 579},
-      {__LINE__, 0.294814, 138.2, 130},
-      {__LINE__, 0.0816532, 12.63, 7},
-      {__LINE__, 0, 682.32, 67},
-      {__LINE__, 0.49405, 999, 999},
-      {__LINE__, 1.000, 0, 9999},
-      {__LINE__, 0.997477, 0.00001, 1},
-      {__LINE__, 0, 5823.21, 5040},
-  };
-  for (const auto& spec : specs) {
-    SCOPED_TRACE(spec.line);
-    const double pval = ChiSquarePValue(spec.chi_square, spec.df);
-    EXPECT_NEAR(spec.pval, pval, 1e-3);
-  }
-}
-
-TEST(ChiSquareTest, CalcChiSquare) {
-  struct {
-    int line;
-    std::vector<int> expected;
-    std::vector<int> actual;
-  } const specs[] = {
-      {__LINE__,
-       {56, 234, 76, 1, 546, 1, 87, 345, 1, 234},
-       {2, 132, 4, 43, 234, 8, 345, 8, 236, 56}},
-      {__LINE__,
-       {123, 36, 234, 367, 345, 2, 456, 567, 234, 567},
-       {123, 56, 2345, 8, 345, 8, 2345, 23, 48, 267}},
-      {__LINE__,
-       {123, 234, 345, 456, 567, 678, 789, 890, 98, 76},
-       {123, 234, 345, 456, 567, 678, 789, 890, 98, 76}},
-      {__LINE__, {3, 675, 23, 86, 2, 8, 2}, {456, 675, 23, 86, 23, 65, 2}},
-      {__LINE__, {1}, {23}},
-  };
-  for (const auto& spec : specs) {
-    SCOPED_TRACE(spec.line);
-    double chi_square = 0;
-    for (int i = 0; i < spec.expected.size(); ++i) {
-      const double diff = spec.actual[i] - spec.expected[i];
-      chi_square += (diff * diff) / spec.expected[i];
-    }
-    EXPECT_NEAR(chi_square,
-                ChiSquare(std::begin(spec.actual), std::end(spec.actual),
-                          std::begin(spec.expected), std::end(spec.expected)),
-                1e-5);
-  }
-}
-
-TEST(ChiSquareTest, CalcChiSquareInt64) {
-  const int64_t data[3] = {910293487, 910292491, 910216780};
-  // $ python -c "import scipy.stats
-  // > print scipy.stats.chisquare([910293487, 910292491, 910216780])[0]"
-  // 4.25410123524
-  double sum = std::accumulate(std::begin(data), std::end(data), double{0});
-  size_t n = std::distance(std::begin(data), std::end(data));
-  double a = ChiSquareWithExpected(std::begin(data), std::end(data), sum / n);
-  EXPECT_NEAR(4.254101, a, 1e-6);
-
-  // ... Or with known values.
-  double b =
-      ChiSquareWithExpected(std::begin(data), std::end(data), 910267586.0);
-  EXPECT_NEAR(4.254101, b, 1e-6);
-}
-
-TEST(ChiSquareTest, TableData) {
-  // Test data from
-  // http://www.itl.nist.gov/div898/handbook/eda/section3/eda3674.htm
-  //    0.90      0.95     0.975      0.99     0.999
-  const double data[100][5] = {
-      /* 1*/ {2.706, 3.841, 5.024, 6.635, 10.828},
-      /* 2*/ {4.605, 5.991, 7.378, 9.210, 13.816},
-      /* 3*/ {6.251, 7.815, 9.348, 11.345, 16.266},
-      /* 4*/ {7.779, 9.488, 11.143, 13.277, 18.467},
-      /* 5*/ {9.236, 11.070, 12.833, 15.086, 20.515},
-      /* 6*/ {10.645, 12.592, 14.449, 16.812, 22.458},
-      /* 7*/ {12.017, 14.067, 16.013, 18.475, 24.322},
-      /* 8*/ {13.362, 15.507, 17.535, 20.090, 26.125},
-      /* 9*/ {14.684, 16.919, 19.023, 21.666, 27.877},
-      /*10*/ {15.987, 18.307, 20.483, 23.209, 29.588},
-      /*11*/ {17.275, 19.675, 21.920, 24.725, 31.264},
-      /*12*/ {18.549, 21.026, 23.337, 26.217, 32.910},
-      /*13*/ {19.812, 22.362, 24.736, 27.688, 34.528},
-      /*14*/ {21.064, 23.685, 26.119, 29.141, 36.123},
-      /*15*/ {22.307, 24.996, 27.488, 30.578, 37.697},
-      /*16*/ {23.542, 26.296, 28.845, 32.000, 39.252},
-      /*17*/ {24.769, 27.587, 30.191, 33.409, 40.790},
-      /*18*/ {25.989, 28.869, 31.526, 34.805, 42.312},
-      /*19*/ {27.204, 30.144, 32.852, 36.191, 43.820},
-      /*20*/ {28.412, 31.410, 34.170, 37.566, 45.315},
-      /*21*/ {29.615, 32.671, 35.479, 38.932, 46.797},
-      /*22*/ {30.813, 33.924, 36.781, 40.289, 48.268},
-      /*23*/ {32.007, 35.172, 38.076, 41.638, 49.728},
-      /*24*/ {33.196, 36.415, 39.364, 42.980, 51.179},
-      /*25*/ {34.382, 37.652, 40.646, 44.314, 52.620},
-      /*26*/ {35.563, 38.885, 41.923, 45.642, 54.052},
-      /*27*/ {36.741, 40.113, 43.195, 46.963, 55.476},
-      /*28*/ {37.916, 41.337, 44.461, 48.278, 56.892},
-      /*29*/ {39.087, 42.557, 45.722, 49.588, 58.301},
-      /*30*/ {40.256, 43.773, 46.979, 50.892, 59.703},
-      /*31*/ {41.422, 44.985, 48.232, 52.191, 61.098},
-      /*32*/ {42.585, 46.194, 49.480, 53.486, 62.487},
-      /*33*/ {43.745, 47.400, 50.725, 54.776, 63.870},
-      /*34*/ {44.903, 48.602, 51.966, 56.061, 65.247},
-      /*35*/ {46.059, 49.802, 53.203, 57.342, 66.619},
-      /*36*/ {47.212, 50.998, 54.437, 58.619, 67.985},
-      /*37*/ {48.363, 52.192, 55.668, 59.893, 69.347},
-      /*38*/ {49.513, 53.384, 56.896, 61.162, 70.703},
-      /*39*/ {50.660, 54.572, 58.120, 62.428, 72.055},
-      /*40*/ {51.805, 55.758, 59.342, 63.691, 73.402},
-      /*41*/ {52.949, 56.942, 60.561, 64.950, 74.745},
-      /*42*/ {54.090, 58.124, 61.777, 66.206, 76.084},
-      /*43*/ {55.230, 59.304, 62.990, 67.459, 77.419},
-      /*44*/ {56.369, 60.481, 64.201, 68.710, 78.750},
-      /*45*/ {57.505, 61.656, 65.410, 69.957, 80.077},
-      /*46*/ {58.641, 62.830, 66.617, 71.201, 81.400},
-      /*47*/ {59.774, 64.001, 67.821, 72.443, 82.720},
-      /*48*/ {60.907, 65.171, 69.023, 73.683, 84.037},
-      /*49*/ {62.038, 66.339, 70.222, 74.919, 85.351},
-      /*50*/ {63.167, 67.505, 71.420, 76.154, 86.661},
-      /*51*/ {64.295, 68.669, 72.616, 77.386, 87.968},
-      /*52*/ {65.422, 69.832, 73.810, 78.616, 89.272},
-      /*53*/ {66.548, 70.993, 75.002, 79.843, 90.573},
-      /*54*/ {67.673, 72.153, 76.192, 81.069, 91.872},
-      /*55*/ {68.796, 73.311, 77.380, 82.292, 93.168},
-      /*56*/ {69.919, 74.468, 78.567, 83.513, 94.461},
-      /*57*/ {71.040, 75.624, 79.752, 84.733, 95.751},
-      /*58*/ {72.160, 76.778, 80.936, 85.950, 97.039},
-      /*59*/ {73.279, 77.931, 82.117, 87.166, 98.324},
-      /*60*/ {74.397, 79.082, 83.298, 88.379, 99.607},
-      /*61*/ {75.514, 80.232, 84.476, 89.591, 100.888},
-      /*62*/ {76.630, 81.381, 85.654, 90.802, 102.166},
-      /*63*/ {77.745, 82.529, 86.830, 92.010, 103.442},
-      /*64*/ {78.860, 83.675, 88.004, 93.217, 104.716},
-      /*65*/ {79.973, 84.821, 89.177, 94.422, 105.988},
-      /*66*/ {81.085, 85.965, 90.349, 95.626, 107.258},
-      /*67*/ {82.197, 87.108, 91.519, 96.828, 108.526},
-      /*68*/ {83.308, 88.250, 92.689, 98.028, 109.791},
-      /*69*/ {84.418, 89.391, 93.856, 99.228, 111.055},
-      /*70*/ {85.527, 90.531, 95.023, 100.425, 112.317},
-      /*71*/ {86.635, 91.670, 96.189, 101.621, 113.577},
-      /*72*/ {87.743, 92.808, 97.353, 102.816, 114.835},
-      /*73*/ {88.850, 93.945, 98.516, 104.010, 116.092},
-      /*74*/ {89.956, 95.081, 99.678, 105.202, 117.346},
-      /*75*/ {91.061, 96.217, 100.839, 106.393, 118.599},
-      /*76*/ {92.166, 97.351, 101.999, 107.583, 119.850},
-      /*77*/ {93.270, 98.484, 103.158, 108.771, 121.100},
-      /*78*/ {94.374, 99.617, 104.316, 109.958, 122.348},
-      /*79*/ {95.476, 100.749, 105.473, 111.144, 123.594},
-      /*80*/ {96.578, 101.879, 106.629, 112.329, 124.839},
-      /*81*/ {97.680, 103.010, 107.783, 113.512, 126.083},
-      /*82*/ {98.780, 104.139, 108.937, 114.695, 127.324},
-      /*83*/ {99.880, 105.267, 110.090, 115.876, 128.565},
-      /*84*/ {100.980, 106.395, 111.242, 117.057, 129.804},
-      /*85*/ {102.079, 107.522, 112.393, 118.236, 131.041},
-      /*86*/ {103.177, 108.648, 113.544, 119.414, 132.277},
-      /*87*/ {104.275, 109.773, 114.693, 120.591, 133.512},
-      /*88*/ {105.372, 110.898, 115.841, 121.767, 134.746},
-      /*89*/ {106.469, 112.022, 116.989, 122.942, 135.978},
-      /*90*/ {107.565, 113.145, 118.136, 124.116, 137.208},
-      /*91*/ {108.661, 114.268, 119.282, 125.289, 138.438},
-      /*92*/ {109.756, 115.390, 120.427, 126.462, 139.666},
-      /*93*/ {110.850, 116.511, 121.571, 127.633, 140.893},
-      /*94*/ {111.944, 117.632, 122.715, 128.803, 142.119},
-      /*95*/ {113.038, 118.752, 123.858, 129.973, 143.344},
-      /*96*/ {114.131, 119.871, 125.000, 131.141, 144.567},
-      /*97*/ {115.223, 120.990, 126.141, 132.309, 145.789},
-      /*98*/ {116.315, 122.108, 127.282, 133.476, 147.010},
-      /*99*/ {117.407, 123.225, 128.422, 134.642, 148.230},
-      /*100*/ {118.498, 124.342, 129.561, 135.807, 149.449}
-      /**/};
-
-  //    0.90      0.95     0.975      0.99     0.999
-  for (int i = 0; i < ABSL_ARRAYSIZE(data); i++) {
-    const double E = 0.0001;
-    EXPECT_NEAR(ChiSquarePValue(data[i][0], i + 1), 0.10, E)
-        << i << " " << data[i][0];
-    EXPECT_NEAR(ChiSquarePValue(data[i][1], i + 1), 0.05, E)
-        << i << " " << data[i][1];
-    EXPECT_NEAR(ChiSquarePValue(data[i][2], i + 1), 0.025, E)
-        << i << " " << data[i][2];
-    EXPECT_NEAR(ChiSquarePValue(data[i][3], i + 1), 0.01, E)
-        << i << " " << data[i][3];
-    EXPECT_NEAR(ChiSquarePValue(data[i][4], i + 1), 0.001, E)
-        << i << " " << data[i][4];
-
-    const double F = 0.1;
-    EXPECT_NEAR(ChiSquareValue(i + 1, 0.90), data[i][0], F) << i;
-    EXPECT_NEAR(ChiSquareValue(i + 1, 0.95), data[i][1], F) << i;
-    EXPECT_NEAR(ChiSquareValue(i + 1, 0.975), data[i][2], F) << i;
-    EXPECT_NEAR(ChiSquareValue(i + 1, 0.99), data[i][3], F) << i;
-    EXPECT_NEAR(ChiSquareValue(i + 1, 0.999), data[i][4], F) << i;
-  }
-}
-
-TEST(ChiSquareTest, ChiSquareTwoIterator) {
-  // Test data from http://www.stat.yale.edu/Courses/1997-98/101/chigf.htm
-  // Null-hypothesis: This data is normally distributed.
-  const int counts[10] = {6, 6, 18, 33, 38, 38, 28, 21, 9, 3};
-  const double expected[10] = {4.6,  8.8,  18.4, 30.0, 38.2,
-                               38.2, 30.0, 18.4, 8.8,  4.6};
-  double chi_square = ChiSquare(std::begin(counts), std::end(counts),
-                                std::begin(expected), std::end(expected));
-  EXPECT_NEAR(chi_square, 2.69, 0.001);
-
-  // Degrees of freedom: 10 bins. two estimated parameters. = 10 - 2 - 1.
-  const int dof = 7;
-  // The critical value of 7, 95% => 14.067 (see above test)
-  double p_value_05 = ChiSquarePValue(14.067, dof);
-  EXPECT_NEAR(p_value_05, 0.05, 0.001);  // 95%-ile p-value
-
-  double p_actual = ChiSquarePValue(chi_square, dof);
-  EXPECT_GT(p_actual, 0.05);  // Accept the null hypothesis.
-}
-
-TEST(ChiSquareTest, DiceRolls) {
-  // Assume we are testing 102 fair dice rolls.
-  // Null-hypothesis: This data is fairly distributed.
-  //
-  // The dof value of 4, @95% = 9.488 (see above test)
-  // The dof value of 5, @95% = 11.070
-  const int rolls[6] = {22, 11, 17, 14, 20, 18};
-  double sum = std::accumulate(std::begin(rolls), std::end(rolls), double{0});
-  size_t n = std::distance(std::begin(rolls), std::end(rolls));
-
-  double a = ChiSquareWithExpected(std::begin(rolls), std::end(rolls), sum / n);
-  EXPECT_NEAR(a, 4.70588, 1e-5);
-  EXPECT_LT(a, ChiSquareValue(4, 0.95));
-
-  double p_a = ChiSquarePValue(a, 4);
-  EXPECT_NEAR(p_a, 0.318828, 1e-5);  // Accept the null hypothesis.
-
-  double b = ChiSquareWithExpected(std::begin(rolls), std::end(rolls), 17.0);
-  EXPECT_NEAR(b, 4.70588, 1e-5);
-  EXPECT_LT(b, ChiSquareValue(5, 0.95));
-
-  double p_b = ChiSquarePValue(b, 5);
-  EXPECT_NEAR(p_b, 0.4528180, 1e-5);  // Accept the null hypothesis.
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/distribution_caller.h b/third_party/abseil_cpp/absl/random/internal/distribution_caller.h
deleted file mode 100644
index fc81b787ebe2..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/distribution_caller.h
+++ /dev/null
@@ -1,92 +0,0 @@
-//
-// Copyright 2018 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-#ifndef ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
-#define ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
-
-#include <utility>
-
-#include "absl/base/config.h"
-#include "absl/base/internal/fast_type_id.h"
-#include "absl/utility/utility.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// DistributionCaller provides an opportunity to overload the general
-// mechanism for calling a distribution, allowing for mock-RNG classes
-// to intercept such calls.
-template <typename URBG>
-struct DistributionCaller {
-  // SFINAE to detect whether the URBG type includes a member matching
-  // bool InvokeMock(base_internal::FastTypeIdType, void*, void*).
-  //
-  // These live inside BitGenRef so that they have friend access
-  // to MockingBitGen. (see similar methods in DistributionCaller).
-  template <template <class...> class Trait, class AlwaysVoid, class... Args>
-  struct detector : std::false_type {};
-  template <template <class...> class Trait, class... Args>
-  struct detector<Trait, absl::void_t<Trait<Args...>>, Args...>
-      : std::true_type {};
-
-  template <class T>
-  using invoke_mock_t = decltype(std::declval<T*>()->InvokeMock(
-      std::declval<::absl::base_internal::FastTypeIdType>(),
-      std::declval<void*>(), std::declval<void*>()));
-
-  using HasInvokeMock = typename detector<invoke_mock_t, void, URBG>::type;
-
-  // Default implementation of distribution caller.
-  template <typename DistrT, typename... Args>
-  static typename DistrT::result_type Impl(std::false_type, URBG* urbg,
-                                           Args&&... args) {
-    DistrT dist(std::forward<Args>(args)...);
-    return dist(*urbg);
-  }
-
-  // Mock implementation of distribution caller.
-  // The underlying KeyT must match the KeyT constructed by MockOverloadSet.
-  template <typename DistrT, typename... Args>
-  static typename DistrT::result_type Impl(std::true_type, URBG* urbg,
-                                           Args&&... args) {
-    using ResultT = typename DistrT::result_type;
-    using ArgTupleT = std::tuple<absl::decay_t<Args>...>;
-    using KeyT = ResultT(DistrT, ArgTupleT);
-
-    ArgTupleT arg_tuple(std::forward<Args>(args)...);
-    ResultT result;
-    if (!urbg->InvokeMock(::absl::base_internal::FastTypeId<KeyT>(), &arg_tuple,
-                          &result)) {
-      auto dist = absl::make_from_tuple<DistrT>(arg_tuple);
-      result = dist(*urbg);
-    }
-    return result;
-  }
-
-  // Default implementation of distribution caller.
-  template <typename DistrT, typename... Args>
-  static typename DistrT::result_type Call(URBG* urbg, Args&&... args) {
-    return Impl<DistrT, Args...>(HasInvokeMock{}, urbg,
-                                 std::forward<Args>(args)...);
-  }
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/distribution_test_util.cc b/third_party/abseil_cpp/absl/random/internal/distribution_test_util.cc
deleted file mode 100644
index e9005658c0a7..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/distribution_test_util.cc
+++ /dev/null
@@ -1,418 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/distribution_test_util.h"
-
-#include <cassert>
-#include <cmath>
-#include <string>
-#include <vector>
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/macros.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/str_format.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-
-#if defined(__EMSCRIPTEN__)
-// Workaround __EMSCRIPTEN__ error: llvm_fma_f64 not found.
-inline double fma(double x, double y, double z) { return (x * y) + z; }
-#endif
-
-}  // namespace
-
-DistributionMoments ComputeDistributionMoments(
-    absl::Span<const double> data_points) {
-  DistributionMoments result;
-
-  // Compute m1
-  for (double x : data_points) {
-    result.n++;
-    result.mean += x;
-  }
-  result.mean /= static_cast<double>(result.n);
-
-  // Compute m2, m3, m4
-  for (double x : data_points) {
-    double v = x - result.mean;
-    result.variance += v * v;
-    result.skewness += v * v * v;
-    result.kurtosis += v * v * v * v;
-  }
-  result.variance /= static_cast<double>(result.n - 1);
-
-  result.skewness /= static_cast<double>(result.n);
-  result.skewness /= std::pow(result.variance, 1.5);
-
-  result.kurtosis /= static_cast<double>(result.n);
-  result.kurtosis /= std::pow(result.variance, 2.0);
-  return result;
-
-  // When validating the min/max count, the following confidence intervals may
-  // be of use:
-  // 3.291 * stddev = 99.9% CI
-  // 2.576 * stddev = 99% CI
-  // 1.96 * stddev  = 95% CI
-  // 1.65 * stddev  = 90% CI
-}
-
-std::ostream& operator<<(std::ostream& os, const DistributionMoments& moments) {
-  return os << absl::StrFormat("mean=%f, stddev=%f, skewness=%f, kurtosis=%f",
-                               moments.mean, std::sqrt(moments.variance),
-                               moments.skewness, moments.kurtosis);
-}
-
-double InverseNormalSurvival(double x) {
-  // inv_sf(u) = -sqrt(2) * erfinv(2u-1)
-  static constexpr double kSqrt2 = 1.4142135623730950488;
-  return -kSqrt2 * absl::random_internal::erfinv(2 * x - 1.0);
-}
-
-bool Near(absl::string_view msg, double actual, double expected, double bound) {
-  assert(bound > 0.0);
-  double delta = fabs(expected - actual);
-  if (delta < bound) {
-    return true;
-  }
-
-  std::string formatted = absl::StrCat(
-      msg, " actual=", actual, " expected=", expected, " err=", delta / bound);
-  ABSL_RAW_LOG(INFO, "%s", formatted.c_str());
-  return false;
-}
-
-// TODO(absl-team): Replace with an "ABSL_HAVE_SPECIAL_MATH" and try
-// to use std::beta().  As of this writing P0226R1 is not implemented
-// in libc++: http://libcxx.llvm.org/cxx1z_status.html
-double beta(double p, double q) {
-  // Beta(x, y) = Gamma(x) * Gamma(y) / Gamma(x+y)
-  double lbeta = std::lgamma(p) + std::lgamma(q) - std::lgamma(p + q);
-  return std::exp(lbeta);
-}
-
-// Approximation to inverse of the Error Function in double precision.
-// (http://people.maths.ox.ac.uk/gilesm/files/gems_erfinv.pdf)
-double erfinv(double x) {
-#if !defined(__EMSCRIPTEN__)
-  using std::fma;
-#endif
-
-  double w = 0.0;
-  double p = 0.0;
-  w = -std::log((1.0 - x) * (1.0 + x));
-  if (w < 6.250000) {
-    w = w - 3.125000;
-    p = -3.6444120640178196996e-21;
-    p = fma(p, w, -1.685059138182016589e-19);
-    p = fma(p, w, 1.2858480715256400167e-18);
-    p = fma(p, w, 1.115787767802518096e-17);
-    p = fma(p, w, -1.333171662854620906e-16);
-    p = fma(p, w, 2.0972767875968561637e-17);
-    p = fma(p, w, 6.6376381343583238325e-15);
-    p = fma(p, w, -4.0545662729752068639e-14);
-    p = fma(p, w, -8.1519341976054721522e-14);
-    p = fma(p, w, 2.6335093153082322977e-12);
-    p = fma(p, w, -1.2975133253453532498e-11);
-    p = fma(p, w, -5.4154120542946279317e-11);
-    p = fma(p, w, 1.051212273321532285e-09);
-    p = fma(p, w, -4.1126339803469836976e-09);
-    p = fma(p, w, -2.9070369957882005086e-08);
-    p = fma(p, w, 4.2347877827932403518e-07);
-    p = fma(p, w, -1.3654692000834678645e-06);
-    p = fma(p, w, -1.3882523362786468719e-05);
-    p = fma(p, w, 0.0001867342080340571352);
-    p = fma(p, w, -0.00074070253416626697512);
-    p = fma(p, w, -0.0060336708714301490533);
-    p = fma(p, w, 0.24015818242558961693);
-    p = fma(p, w, 1.6536545626831027356);
-  } else if (w < 16.000000) {
-    w = std::sqrt(w) - 3.250000;
-    p = 2.2137376921775787049e-09;
-    p = fma(p, w, 9.0756561938885390979e-08);
-    p = fma(p, w, -2.7517406297064545428e-07);
-    p = fma(p, w, 1.8239629214389227755e-08);
-    p = fma(p, w, 1.5027403968909827627e-06);
-    p = fma(p, w, -4.013867526981545969e-06);
-    p = fma(p, w, 2.9234449089955446044e-06);
-    p = fma(p, w, 1.2475304481671778723e-05);
-    p = fma(p, w, -4.7318229009055733981e-05);
-    p = fma(p, w, 6.8284851459573175448e-05);
-    p = fma(p, w, 2.4031110387097893999e-05);
-    p = fma(p, w, -0.0003550375203628474796);
-    p = fma(p, w, 0.00095328937973738049703);
-    p = fma(p, w, -0.0016882755560235047313);
-    p = fma(p, w, 0.0024914420961078508066);
-    p = fma(p, w, -0.0037512085075692412107);
-    p = fma(p, w, 0.005370914553590063617);
-    p = fma(p, w, 1.0052589676941592334);
-    p = fma(p, w, 3.0838856104922207635);
-  } else {
-    w = std::sqrt(w) - 5.000000;
-    p = -2.7109920616438573243e-11;
-    p = fma(p, w, -2.5556418169965252055e-10);
-    p = fma(p, w, 1.5076572693500548083e-09);
-    p = fma(p, w, -3.7894654401267369937e-09);
-    p = fma(p, w, 7.6157012080783393804e-09);
-    p = fma(p, w, -1.4960026627149240478e-08);
-    p = fma(p, w, 2.9147953450901080826e-08);
-    p = fma(p, w, -6.7711997758452339498e-08);
-    p = fma(p, w, 2.2900482228026654717e-07);
-    p = fma(p, w, -9.9298272942317002539e-07);
-    p = fma(p, w, 4.5260625972231537039e-06);
-    p = fma(p, w, -1.9681778105531670567e-05);
-    p = fma(p, w, 7.5995277030017761139e-05);
-    p = fma(p, w, -0.00021503011930044477347);
-    p = fma(p, w, -0.00013871931833623122026);
-    p = fma(p, w, 1.0103004648645343977);
-    p = fma(p, w, 4.8499064014085844221);
-  }
-  return p * x;
-}
-
-namespace {
-
-// Direct implementation of AS63, BETAIN()
-// https://www.jstor.org/stable/2346797?seq=3#page_scan_tab_contents.
-//
-// BETAIN(x, p, q, beta)
-//  x:     the value of the upper limit x.
-//  p:     the value of the parameter p.
-//  q:     the value of the parameter q.
-//  beta:  the value of ln B(p, q)
-//
-double BetaIncompleteImpl(const double x, const double p, const double q,
-                          const double beta) {
-  if (p < (p + q) * x) {
-    // Incomplete beta function is symmetrical, so return the complement.
-    return 1. - BetaIncompleteImpl(1.0 - x, q, p, beta);
-  }
-
-  double psq = p + q;
-  const double kErr = 1e-14;
-  const double xc = 1. - x;
-  const double pre =
-      std::exp(p * std::log(x) + (q - 1.) * std::log(xc) - beta) / p;
-
-  double term = 1.;
-  double ai = 1.;
-  double result = 1.;
-  int ns = static_cast<int>(q + xc * psq);
-
-  // Use the soper reduction forumla.
-  double rx = (ns == 0) ? x : x / xc;
-  double temp = q - ai;
-  for (;;) {
-    term = term * temp * rx / (p + ai);
-    result = result + term;
-    temp = std::fabs(term);
-    if (temp < kErr && temp < kErr * result) {
-      return result * pre;
-    }
-    ai = ai + 1.;
-    --ns;
-    if (ns >= 0) {
-      temp = q - ai;
-      if (ns == 0) {
-        rx = x;
-      }
-    } else {
-      temp = psq;
-      psq = psq + 1.;
-    }
-  }
-
-  // NOTE: See also TOMS Alogrithm 708.
-  // http://www.netlib.org/toms/index.html
-  //
-  // NOTE: The NWSC library also includes BRATIO / ISUBX (p87)
-  // https://archive.org/details/DTIC_ADA261511/page/n75
-}
-
-// Direct implementation of AS109, XINBTA(p, q, beta, alpha)
-// https://www.jstor.org/stable/2346798?read-now=1&seq=4#page_scan_tab_contents
-// https://www.jstor.org/stable/2346887?seq=1#page_scan_tab_contents
-//
-// XINBTA(p, q, beta, alhpa)
-//  p:     the value of the parameter p.
-//  q:     the value of the parameter q.
-//  beta:  the value of ln B(p, q)
-//  alpha: the value of the lower tail area.
-//
-double BetaIncompleteInvImpl(const double p, const double q, const double beta,
-                             const double alpha) {
-  if (alpha < 0.5) {
-    // Inverse Incomplete beta function is symmetrical, return the complement.
-    return 1. - BetaIncompleteInvImpl(q, p, beta, 1. - alpha);
-  }
-  const double kErr = 1e-14;
-  double value = kErr;
-
-  // Compute the initial estimate.
-  {
-    double r = std::sqrt(-std::log(alpha * alpha));
-    double y =
-        r - fma(r, 0.27061, 2.30753) / fma(r, fma(r, 0.04481, 0.99229), 1.0);
-    if (p > 1. && q > 1.) {
-      r = (y * y - 3.) / 6.;
-      double s = 1. / (p + p - 1.);
-      double t = 1. / (q + q - 1.);
-      double h = 2. / s + t;
-      double w =
-          y * std::sqrt(h + r) / h - (t - s) * (r + 5. / 6. - t / (3. * h));
-      value = p / (p + q * std::exp(w + w));
-    } else {
-      r = q + q;
-      double t = 1.0 / (9. * q);
-      double u = 1.0 - t + y * std::sqrt(t);
-      t = r * (u * u * u);
-      if (t <= 0) {
-        value = 1.0 - std::exp((std::log((1.0 - alpha) * q) + beta) / q);
-      } else {
-        t = (4.0 * p + r - 2.0) / t;
-        if (t <= 1) {
-          value = std::exp((std::log(alpha * p) + beta) / p);
-        } else {
-          value = 1.0 - 2.0 / (t + 1.0);
-        }
-      }
-    }
-  }
-
-  // Solve for x using a modified newton-raphson method using the function
-  // BetaIncomplete.
-  {
-    value = std::max(value, kErr);
-    value = std::min(value, 1.0 - kErr);
-
-    const double r = 1.0 - p;
-    const double t = 1.0 - q;
-    double y;
-    double yprev = 0;
-    double sq = 1;
-    double prev = 1;
-    for (;;) {
-      if (value < 0 || value > 1.0) {
-        // Error case; value went infinite.
-        return std::numeric_limits<double>::infinity();
-      } else if (value == 0 || value == 1) {
-        y = value;
-      } else {
-        y = BetaIncompleteImpl(value, p, q, beta);
-        if (!std::isfinite(y)) {
-          return y;
-        }
-      }
-      y = (y - alpha) *
-          std::exp(beta + r * std::log(value) + t * std::log(1.0 - value));
-      if (y * yprev <= 0) {
-        prev = std::max(sq, std::numeric_limits<double>::min());
-      }
-      double g = 1.0;
-      for (;;) {
-        const double adj = g * y;
-        const double adj_sq = adj * adj;
-        if (adj_sq >= prev) {
-          g = g / 3.0;
-          continue;
-        }
-        const double tx = value - adj;
-        if (tx < 0 || tx > 1) {
-          g = g / 3.0;
-          continue;
-        }
-        if (prev < kErr) {
-          return value;
-        }
-        if (y * y < kErr) {
-          return value;
-        }
-        if (tx == value) {
-          return value;
-        }
-        if (tx == 0 || tx == 1) {
-          g = g / 3.0;
-          continue;
-        }
-        value = tx;
-        yprev = y;
-        break;
-      }
-    }
-  }
-
-  // NOTES: See also: Asymptotic inversion of the incomplete beta function.
-  // https://core.ac.uk/download/pdf/82140723.pdf
-  //
-  // NOTE: See the Boost library documentation as well:
-  // https://www.boost.org/doc/libs/1_52_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/sf_beta/ibeta_function.html
-}
-
-}  // namespace
-
-double BetaIncomplete(const double x, const double p, const double q) {
-  // Error cases.
-  if (p < 0 || q < 0 || x < 0 || x > 1.0) {
-    return std::numeric_limits<double>::infinity();
-  }
-  if (x == 0 || x == 1) {
-    return x;
-  }
-  // ln(Beta(p, q))
-  double beta = std::lgamma(p) + std::lgamma(q) - std::lgamma(p + q);
-  return BetaIncompleteImpl(x, p, q, beta);
-}
-
-double BetaIncompleteInv(const double p, const double q, const double alpha) {
-  // Error cases.
-  if (p < 0 || q < 0 || alpha < 0 || alpha > 1.0) {
-    return std::numeric_limits<double>::infinity();
-  }
-  if (alpha == 0 || alpha == 1) {
-    return alpha;
-  }
-  // ln(Beta(p, q))
-  double beta = std::lgamma(p) + std::lgamma(q) - std::lgamma(p + q);
-  return BetaIncompleteInvImpl(p, q, beta, alpha);
-}
-
-// Given `num_trials` trials each with probability `p` of success, the
-// probability of no failures is `p^k`. To ensure the probability of a failure
-// is no more than `p_fail`, it must be that `p^k == 1 - p_fail`. This function
-// computes `p` from that equation.
-double RequiredSuccessProbability(const double p_fail, const int num_trials) {
-  double p = std::exp(std::log(1.0 - p_fail) / static_cast<double>(num_trials));
-  ABSL_ASSERT(p > 0);
-  return p;
-}
-
-double ZScore(double expected_mean, const DistributionMoments& moments) {
-  return (moments.mean - expected_mean) /
-         (std::sqrt(moments.variance) /
-          std::sqrt(static_cast<double>(moments.n)));
-}
-
-double MaxErrorTolerance(double acceptance_probability) {
-  double one_sided_pvalue = 0.5 * (1.0 - acceptance_probability);
-  const double max_err = InverseNormalSurvival(one_sided_pvalue);
-  ABSL_ASSERT(max_err > 0);
-  return max_err;
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/distribution_test_util.h b/third_party/abseil_cpp/absl/random/internal/distribution_test_util.h
deleted file mode 100644
index 6d94cf6c97bf..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/distribution_test_util.h
+++ /dev/null
@@ -1,113 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_DISTRIBUTION_TEST_UTIL_H_
-#define ABSL_RANDOM_INTERNAL_DISTRIBUTION_TEST_UTIL_H_
-
-#include <cstddef>
-#include <iostream>
-#include <vector>
-
-#include "absl/strings/string_view.h"
-#include "absl/types/span.h"
-
-// NOTE: The functions in this file are test only, and are should not be used in
-// non-test code.
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// http://webspace.ship.edu/pgmarr/Geo441/Lectures/Lec%205%20-%20Normality%20Testing.pdf
-
-// Compute the 1st to 4th standard moments:
-// mean, variance, skewness, and kurtosis.
-// http://www.itl.nist.gov/div898/handbook/eda/section3/eda35b.htm
-struct DistributionMoments {
-  size_t n = 0;
-  double mean = 0.0;
-  double variance = 0.0;
-  double skewness = 0.0;
-  double kurtosis = 0.0;
-};
-DistributionMoments ComputeDistributionMoments(
-    absl::Span<const double> data_points);
-
-std::ostream& operator<<(std::ostream& os, const DistributionMoments& moments);
-
-// Computes the Z-score for a set of data with the given distribution moments
-// compared against `expected_mean`.
-double ZScore(double expected_mean, const DistributionMoments& moments);
-
-// Returns the probability of success required for a single trial to ensure that
-// after `num_trials` trials, the probability of at least one failure is no more
-// than `p_fail`.
-double RequiredSuccessProbability(double p_fail, int num_trials);
-
-// Computes the maximum distance from the mean tolerable, for Z-Tests that are
-// expected to pass with `acceptance_probability`. Will terminate if the
-// resulting tolerance is zero (due to passing in 0.0 for
-// `acceptance_probability` or rounding errors).
-//
-// For example,
-// MaxErrorTolerance(0.001) = 0.0
-// MaxErrorTolerance(0.5) = ~0.47
-// MaxErrorTolerance(1.0) = inf
-double MaxErrorTolerance(double acceptance_probability);
-
-// Approximation to inverse of the Error Function in double precision.
-// (http://people.maths.ox.ac.uk/gilesm/files/gems_erfinv.pdf)
-double erfinv(double x);
-
-// Beta(p, q) = Gamma(p) * Gamma(q) / Gamma(p+q)
-double beta(double p, double q);
-
-// The inverse of the normal survival function.
-double InverseNormalSurvival(double x);
-
-// Returns whether actual is "near" expected, based on the bound.
-bool Near(absl::string_view msg, double actual, double expected, double bound);
-
-// Implements the incomplete regularized beta function, AS63, BETAIN.
-//    https://www.jstor.org/stable/2346797
-//
-// BetaIncomplete(x, p, q), where
-//   `x` is the value of the upper limit
-//   `p` is beta parameter p, `q` is beta parameter q.
-//
-// NOTE: This is a test-only function which is only accurate to within, at most,
-// 1e-13 of the actual value.
-//
-double BetaIncomplete(double x, double p, double q);
-
-// Implements the inverse of the incomplete regularized beta function, AS109,
-// XINBTA.
-//   https://www.jstor.org/stable/2346798
-//   https://www.jstor.org/stable/2346887
-//
-// BetaIncompleteInv(p, q, beta, alhpa)
-//   `p` is beta parameter p, `q` is beta parameter q.
-//   `alpha` is the value of the lower tail area.
-//
-// NOTE: This is a test-only function and, when successful, is only accurate to
-// within ~1e-6 of the actual value; there are some cases where it diverges from
-// the actual value by much more than that.  The function uses Newton's method,
-// and thus the runtime is highly variable.
-double BetaIncompleteInv(double p, double q, double alpha);
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_DISTRIBUTION_TEST_UTIL_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/distribution_test_util_test.cc b/third_party/abseil_cpp/absl/random/internal/distribution_test_util_test.cc
deleted file mode 100644
index c49d44fb4796..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/distribution_test_util_test.cc
+++ /dev/null
@@ -1,193 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/distribution_test_util.h"
-
-#include "gtest/gtest.h"
-
-namespace {
-
-TEST(TestUtil, InverseErf) {
-  const struct {
-    const double z;
-    const double value;
-  } kErfInvTable[] = {
-      {0.0000001, 8.86227e-8},
-      {0.00001, 8.86227e-6},
-      {0.5, 0.4769362762044},
-      {0.6, 0.5951160814499},
-      {0.99999, 3.1234132743},
-      {0.9999999, 3.7665625816},
-      {0.999999944, 3.8403850690566985},  // = log((1-x) * (1+x)) =~ 16.004
-      {0.999999999, 4.3200053849134452},
-  };
-
-  for (const auto& data : kErfInvTable) {
-    auto value = absl::random_internal::erfinv(data.z);
-
-    // Log using the Wolfram-alpha function name & parameters.
-    EXPECT_NEAR(value, data.value, 1e-8)
-        << " InverseErf[" << data.z << "]  (expected=" << data.value << ")  -> "
-        << value;
-  }
-}
-
-const struct {
-  const double p;
-  const double q;
-  const double x;
-  const double alpha;
-} kBetaTable[] = {
-    {0.5, 0.5, 0.01, 0.06376856085851985},
-    {0.5, 0.5, 0.1, 0.2048327646991335},
-    {0.5, 0.5, 1, 1},
-    {1, 0.5, 0, 0},
-    {1, 0.5, 0.01, 0.005012562893380045},
-    {1, 0.5, 0.1, 0.0513167019494862},
-    {1, 0.5, 0.5, 0.2928932188134525},
-    {1, 1, 0.5, 0.5},
-    {2, 2, 0.1, 0.028},
-    {2, 2, 0.2, 0.104},
-    {2, 2, 0.3, 0.216},
-    {2, 2, 0.4, 0.352},
-    {2, 2, 0.5, 0.5},
-    {2, 2, 0.6, 0.648},
-    {2, 2, 0.7, 0.784},
-    {2, 2, 0.8, 0.896},
-    {2, 2, 0.9, 0.972},
-    {5.5, 5, 0.5, 0.4361908850559777},
-    {10, 0.5, 0.9, 0.1516409096346979},
-    {10, 5, 0.5, 0.08978271484375},
-    {10, 5, 1, 1},
-    {10, 10, 0.5, 0.5},
-    {20, 5, 0.8, 0.4598773297575791},
-    {20, 10, 0.6, 0.2146816102371739},
-    {20, 10, 0.8, 0.9507364826957875},
-    {20, 20, 0.5, 0.5},
-    {20, 20, 0.6, 0.8979413687105918},
-    {30, 10, 0.7, 0.2241297491808366},
-    {30, 10, 0.8, 0.7586405487192086},
-    {40, 20, 0.7, 0.7001783247477069},
-    {1, 0.5, 0.1, 0.0513167019494862},
-    {1, 0.5, 0.2, 0.1055728090000841},
-    {1, 0.5, 0.3, 0.1633399734659245},
-    {1, 0.5, 0.4, 0.2254033307585166},
-    {1, 2, 0.2, 0.36},
-    {1, 3, 0.2, 0.488},
-    {1, 4, 0.2, 0.5904},
-    {1, 5, 0.2, 0.67232},
-    {2, 2, 0.3, 0.216},
-    {3, 2, 0.3, 0.0837},
-    {4, 2, 0.3, 0.03078},
-    {5, 2, 0.3, 0.010935},
-
-    // These values test small & large points along the range of the Beta
-    // function.
-    //
-    // When selecting test points, remember that if BetaIncomplete(x, p, q)
-    // returns the same value to within the limits of precision over a large
-    // domain of the input, x, then BetaIncompleteInv(alpha, p, q) may return an
-    // essentially arbitrary value where BetaIncomplete(x, p, q) =~ alpha.
-
-    // BetaRegularized[x, 0.00001, 0.00001],
-    // For x in {~0.001 ... ~0.999}, => ~0.5
-    {1e-5, 1e-5, 1e-5, 0.4999424388184638311},
-    {1e-5, 1e-5, (1.0 - 1e-8), 0.5000920948389232964},
-
-    // BetaRegularized[x, 0.00001, 10000].
-    // For x in {~epsilon ... 1.0}, => ~1
-    {1e-5, 1e5, 1e-6, 0.9999817708130066936},
-    {1e-5, 1e5, (1.0 - 1e-7), 1.0},
-
-    // BetaRegularized[x, 10000, 0.00001].
-    // For x in {0 .. 1-epsilon}, => ~0
-    {1e5, 1e-5, 1e-6, 0},
-    {1e5, 1e-5, (1.0 - 1e-6), 1.8229186993306369e-5},
-};
-
-TEST(BetaTest, BetaIncomplete) {
-  for (const auto& data : kBetaTable) {
-    auto value = absl::random_internal::BetaIncomplete(data.x, data.p, data.q);
-
-    // Log using the Wolfram-alpha function name & parameters.
-    EXPECT_NEAR(value, data.alpha, 1e-12)
-        << " BetaRegularized[" << data.x << ", " << data.p << ", " << data.q
-        << "]  (expected=" << data.alpha << ")  -> " << value;
-  }
-}
-
-TEST(BetaTest, BetaIncompleteInv) {
-  for (const auto& data : kBetaTable) {
-    auto value =
-        absl::random_internal::BetaIncompleteInv(data.p, data.q, data.alpha);
-
-    // Log using the Wolfram-alpha function name & parameters.
-    EXPECT_NEAR(value, data.x, 1e-6)
-        << " InverseBetaRegularized[" << data.alpha << ", " << data.p << ", "
-        << data.q << "]  (expected=" << data.x << ")  -> " << value;
-  }
-}
-
-TEST(MaxErrorTolerance, MaxErrorTolerance) {
-  std::vector<std::pair<double, double>> cases = {
-      {0.0000001, 8.86227e-8 * 1.41421356237},
-      {0.00001, 8.86227e-6 * 1.41421356237},
-      {0.5, 0.4769362762044 * 1.41421356237},
-      {0.6, 0.5951160814499 * 1.41421356237},
-      {0.99999, 3.1234132743 * 1.41421356237},
-      {0.9999999, 3.7665625816 * 1.41421356237},
-      {0.999999944, 3.8403850690566985 * 1.41421356237},
-      {0.999999999, 4.3200053849134452 * 1.41421356237}};
-  for (auto entry : cases) {
-    EXPECT_NEAR(absl::random_internal::MaxErrorTolerance(entry.first),
-                entry.second, 1e-8);
-  }
-}
-
-TEST(ZScore, WithSameMean) {
-  absl::random_internal::DistributionMoments m;
-  m.n = 100;
-  m.mean = 5;
-  m.variance = 1;
-  EXPECT_NEAR(absl::random_internal::ZScore(5, m), 0, 1e-12);
-
-  m.n = 1;
-  m.mean = 0;
-  m.variance = 1;
-  EXPECT_NEAR(absl::random_internal::ZScore(0, m), 0, 1e-12);
-
-  m.n = 10000;
-  m.mean = -5;
-  m.variance = 100;
-  EXPECT_NEAR(absl::random_internal::ZScore(-5, m), 0, 1e-12);
-}
-
-TEST(ZScore, DifferentMean) {
-  absl::random_internal::DistributionMoments m;
-  m.n = 100;
-  m.mean = 5;
-  m.variance = 1;
-  EXPECT_NEAR(absl::random_internal::ZScore(4, m), 10, 1e-12);
-
-  m.n = 1;
-  m.mean = 0;
-  m.variance = 1;
-  EXPECT_NEAR(absl::random_internal::ZScore(-1, m), 1, 1e-12);
-
-  m.n = 10000;
-  m.mean = -5;
-  m.variance = 100;
-  EXPECT_NEAR(absl::random_internal::ZScore(-4, m), -10, 1e-12);
-}
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/explicit_seed_seq.h b/third_party/abseil_cpp/absl/random/internal/explicit_seed_seq.h
deleted file mode 100644
index 6a743eaf46cc..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/explicit_seed_seq.h
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_EXPLICIT_SEED_SEQ_H_
-#define ABSL_RANDOM_INTERNAL_EXPLICIT_SEED_SEQ_H_
-
-#include <algorithm>
-#include <cstddef>
-#include <cstdint>
-#include <initializer_list>
-#include <iterator>
-#include <vector>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// This class conforms to the C++ Standard "Seed Sequence" concept
-// [rand.req.seedseq].
-//
-// An "ExplicitSeedSeq" is meant to provide a conformant interface for
-// forwarding pre-computed seed material to the constructor of a class
-// conforming to the "Uniform Random Bit Generator" concept. This class makes no
-// attempt to mutate the state provided by its constructor, and returns it
-// directly via ExplicitSeedSeq::generate().
-//
-// If this class is asked to generate more seed material than was provided to
-// the constructor, then the remaining bytes will be filled with deterministic,
-// nonrandom data.
-class ExplicitSeedSeq {
- public:
-  using result_type = uint32_t;
-
-  ExplicitSeedSeq() : state_() {}
-
-  // Copy and move both allowed.
-  ExplicitSeedSeq(const ExplicitSeedSeq& other) = default;
-  ExplicitSeedSeq& operator=(const ExplicitSeedSeq& other) = default;
-  ExplicitSeedSeq(ExplicitSeedSeq&& other) = default;
-  ExplicitSeedSeq& operator=(ExplicitSeedSeq&& other) = default;
-
-  template <typename Iterator>
-  ExplicitSeedSeq(Iterator begin, Iterator end) {
-    for (auto it = begin; it != end; it++) {
-      state_.push_back(*it & 0xffffffff);
-    }
-  }
-
-  template <typename T>
-  ExplicitSeedSeq(std::initializer_list<T> il)
-      : ExplicitSeedSeq(il.begin(), il.end()) {}
-
-  size_t size() const { return state_.size(); }
-
-  template <typename OutIterator>
-  void param(OutIterator out) const {
-    std::copy(std::begin(state_), std::end(state_), out);
-  }
-
-  template <typename OutIterator>
-  void generate(OutIterator begin, OutIterator end) {
-    for (size_t index = 0; begin != end; begin++) {
-      *begin = state_.empty() ? 0 : state_[index++];
-      if (index >= state_.size()) {
-        index = 0;
-      }
-    }
-  }
-
- protected:
-  std::vector<uint32_t> state_;
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_EXPLICIT_SEED_SEQ_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/explicit_seed_seq_test.cc b/third_party/abseil_cpp/absl/random/internal/explicit_seed_seq_test.cc
deleted file mode 100644
index a55ad73948b9..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/explicit_seed_seq_test.cc
+++ /dev/null
@@ -1,204 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/explicit_seed_seq.h"
-
-#include <iterator>
-#include <random>
-#include <utility>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/random/seed_sequences.h"
-
-namespace {
-
-template <typename Sseq>
-bool ConformsToInterface() {
-  // Check that the SeedSequence can be default-constructed.
-  { Sseq default_constructed_seq; }
-  // Check that the SeedSequence can be constructed with two iterators.
-  {
-    uint32_t init_array[] = {1, 3, 5, 7, 9};
-    Sseq iterator_constructed_seq(init_array, &init_array[5]);
-  }
-  // Check that the SeedSequence can be std::initializer_list-constructed.
-  { Sseq list_constructed_seq = {1, 3, 5, 7, 9, 11, 13}; }
-  // Check that param() and size() return state provided to constructor.
-  {
-    uint32_t init_array[] = {1, 2, 3, 4, 5};
-    Sseq seq(init_array, &init_array[ABSL_ARRAYSIZE(init_array)]);
-    EXPECT_EQ(seq.size(), ABSL_ARRAYSIZE(init_array));
-
-    uint32_t state_array[ABSL_ARRAYSIZE(init_array)];
-    seq.param(state_array);
-
-    for (int i = 0; i < ABSL_ARRAYSIZE(state_array); i++) {
-      EXPECT_EQ(state_array[i], i + 1);
-    }
-  }
-  // Check for presence of generate() method.
-  {
-    Sseq seq;
-    uint32_t seeds[5];
-
-    seq.generate(seeds, &seeds[ABSL_ARRAYSIZE(seeds)]);
-  }
-  return true;
-}
-}  // namespace
-
-TEST(SeedSequences, CheckInterfaces) {
-  // Control case
-  EXPECT_TRUE(ConformsToInterface<std::seed_seq>());
-
-  // Abseil classes
-  EXPECT_TRUE(ConformsToInterface<absl::random_internal::ExplicitSeedSeq>());
-}
-
-TEST(ExplicitSeedSeq, DefaultConstructorGeneratesZeros) {
-  const size_t kNumBlocks = 128;
-
-  uint32_t outputs[kNumBlocks];
-  absl::random_internal::ExplicitSeedSeq seq;
-  seq.generate(outputs, &outputs[kNumBlocks]);
-
-  for (uint32_t& seed : outputs) {
-    EXPECT_EQ(seed, 0);
-  }
-}
-
-TEST(ExplicitSeeqSeq, SeedMaterialIsForwardedIdentically) {
-  const size_t kNumBlocks = 128;
-
-  uint32_t seed_material[kNumBlocks];
-  std::random_device urandom{"/dev/urandom"};
-  for (uint32_t& seed : seed_material) {
-    seed = urandom();
-  }
-  absl::random_internal::ExplicitSeedSeq seq(seed_material,
-                                             &seed_material[kNumBlocks]);
-
-  // Check that output is same as seed-material provided to constructor.
-  {
-    const size_t kNumGenerated = kNumBlocks / 2;
-    uint32_t outputs[kNumGenerated];
-    seq.generate(outputs, &outputs[kNumGenerated]);
-    for (size_t i = 0; i < kNumGenerated; i++) {
-      EXPECT_EQ(outputs[i], seed_material[i]);
-    }
-  }
-  // Check that SeedSequence is stateless between invocations: Despite the last
-  // invocation of generate() only consuming half of the input-entropy, the same
-  // entropy will be recycled for the next invocation.
-  {
-    const size_t kNumGenerated = kNumBlocks;
-    uint32_t outputs[kNumGenerated];
-    seq.generate(outputs, &outputs[kNumGenerated]);
-    for (size_t i = 0; i < kNumGenerated; i++) {
-      EXPECT_EQ(outputs[i], seed_material[i]);
-    }
-  }
-  // Check that when more seed-material is asked for than is provided, nonzero
-  // values are still written.
-  {
-    const size_t kNumGenerated = kNumBlocks * 2;
-    uint32_t outputs[kNumGenerated];
-    seq.generate(outputs, &outputs[kNumGenerated]);
-    for (size_t i = 0; i < kNumGenerated; i++) {
-      EXPECT_EQ(outputs[i], seed_material[i % kNumBlocks]);
-    }
-  }
-}
-
-TEST(ExplicitSeedSeq, CopyAndMoveConstructors) {
-  using testing::Each;
-  using testing::Eq;
-  using testing::Not;
-  using testing::Pointwise;
-
-  uint32_t entropy[4];
-  std::random_device urandom("/dev/urandom");
-  for (uint32_t& entry : entropy) {
-    entry = urandom();
-  }
-  absl::random_internal::ExplicitSeedSeq seq_from_entropy(std::begin(entropy),
-                                                          std::end(entropy));
-  // Copy constructor.
-  {
-    absl::random_internal::ExplicitSeedSeq seq_copy(seq_from_entropy);
-    EXPECT_EQ(seq_copy.size(), seq_from_entropy.size());
-
-    std::vector<uint32_t> seeds_1;
-    seeds_1.resize(1000, 0);
-    std::vector<uint32_t> seeds_2;
-    seeds_2.resize(1000, 1);
-
-    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
-    seq_copy.generate(seeds_2.begin(), seeds_2.end());
-
-    EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
-  }
-  // Assignment operator.
-  {
-    for (uint32_t& entry : entropy) {
-      entry = urandom();
-    }
-    absl::random_internal::ExplicitSeedSeq another_seq(std::begin(entropy),
-                                                       std::end(entropy));
-
-    std::vector<uint32_t> seeds_1;
-    seeds_1.resize(1000, 0);
-    std::vector<uint32_t> seeds_2;
-    seeds_2.resize(1000, 0);
-
-    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
-    another_seq.generate(seeds_2.begin(), seeds_2.end());
-
-    // Assert precondition: Sequences generated by seed-sequences are not equal.
-    EXPECT_THAT(seeds_1, Not(Pointwise(Eq(), seeds_2)));
-
-    // Apply the assignment-operator.
-    another_seq = seq_from_entropy;
-
-    // Re-generate seeds.
-    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
-    another_seq.generate(seeds_2.begin(), seeds_2.end());
-
-    // Seeds generated by seed-sequences should now be equal.
-    EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
-  }
-  // Move constructor.
-  {
-    // Get seeds from seed-sequence constructed from entropy.
-    std::vector<uint32_t> seeds_1;
-    seeds_1.resize(1000, 0);
-    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
-
-    // Apply move-constructor move the sequence to another instance.
-    absl::random_internal::ExplicitSeedSeq moved_seq(
-        std::move(seq_from_entropy));
-    std::vector<uint32_t> seeds_2;
-    seeds_2.resize(1000, 1);
-    moved_seq.generate(seeds_2.begin(), seeds_2.end());
-    // Verify that seeds produced by moved-instance are the same as original.
-    EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
-
-    // Verify that the moved-from instance now behaves like a
-    // default-constructed instance.
-    EXPECT_EQ(seq_from_entropy.size(), 0);
-    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
-    EXPECT_THAT(seeds_1, Each(Eq(0)));
-  }
-}
diff --git a/third_party/abseil_cpp/absl/random/internal/fast_uniform_bits.h b/third_party/abseil_cpp/absl/random/internal/fast_uniform_bits.h
deleted file mode 100644
index 425aaf7d830c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/fast_uniform_bits.h
+++ /dev/null
@@ -1,268 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_FAST_UNIFORM_BITS_H_
-#define ABSL_RANDOM_INTERNAL_FAST_UNIFORM_BITS_H_
-
-#include <cstddef>
-#include <cstdint>
-#include <limits>
-#include <type_traits>
-
-#include "absl/base/config.h"
-#include "absl/meta/type_traits.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-// Returns true if the input value is zero or a power of two. Useful for
-// determining if the range of output values in a URBG
-template <typename UIntType>
-constexpr bool IsPowerOfTwoOrZero(UIntType n) {
-  return (n == 0) || ((n & (n - 1)) == 0);
-}
-
-// Computes the length of the range of values producible by the URBG, or returns
-// zero if that would encompass the entire range of representable values in
-// URBG::result_type.
-template <typename URBG>
-constexpr typename URBG::result_type RangeSize() {
-  using result_type = typename URBG::result_type;
-  static_assert((URBG::max)() != (URBG::min)(), "URBG range cannot be 0.");
-  return ((URBG::max)() == (std::numeric_limits<result_type>::max)() &&
-          (URBG::min)() == std::numeric_limits<result_type>::lowest())
-             ? result_type{0}
-             : ((URBG::max)() - (URBG::min)() + result_type{1});
-}
-
-// Computes the floor of the log. (i.e., std::floor(std::log2(N));
-template <typename UIntType>
-constexpr UIntType IntegerLog2(UIntType n) {
-  return (n <= 1) ? 0 : 1 + IntegerLog2(n >> 1);
-}
-
-// Returns the number of bits of randomness returned through
-// `PowerOfTwoVariate(urbg)`.
-template <typename URBG>
-constexpr size_t NumBits() {
-  return RangeSize<URBG>() == 0
-             ? std::numeric_limits<typename URBG::result_type>::digits
-             : IntegerLog2(RangeSize<URBG>());
-}
-
-// Given a shift value `n`, constructs a mask with exactly the low `n` bits set.
-// If `n == 0`, all bits are set.
-template <typename UIntType>
-constexpr UIntType MaskFromShift(size_t n) {
-  return ((n % std::numeric_limits<UIntType>::digits) == 0)
-             ? ~UIntType{0}
-             : (UIntType{1} << n) - UIntType{1};
-}
-
-// Tags used to dispatch FastUniformBits::generate to the simple or more complex
-// entropy extraction algorithm.
-struct SimplifiedLoopTag {};
-struct RejectionLoopTag {};
-
-// FastUniformBits implements a fast path to acquire uniform independent bits
-// from a type which conforms to the [rand.req.urbg] concept.
-// Parameterized by:
-//  `UIntType`: the result (output) type
-//
-// The std::independent_bits_engine [rand.adapt.ibits] adaptor can be
-// instantiated from an existing generator through a copy or a move. It does
-// not, however, facilitate the production of pseudorandom bits from an un-owned
-// generator that will outlive the std::independent_bits_engine instance.
-template <typename UIntType = uint64_t>
-class FastUniformBits {
- public:
-  using result_type = UIntType;
-
-  static constexpr result_type(min)() { return 0; }
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  template <typename URBG>
-  result_type operator()(URBG& g);  // NOLINT(runtime/references)
-
- private:
-  static_assert(std::is_unsigned<UIntType>::value,
-                "Class-template FastUniformBits<> must be parameterized using "
-                "an unsigned type.");
-
-  // Generate() generates a random value, dispatched on whether
-  // the underlying URBG must use rejection sampling to generate a value,
-  // or whether a simplified loop will suffice.
-  template <typename URBG>
-  result_type Generate(URBG& g,  // NOLINT(runtime/references)
-                       SimplifiedLoopTag);
-
-  template <typename URBG>
-  result_type Generate(URBG& g,  // NOLINT(runtime/references)
-                       RejectionLoopTag);
-};
-
-template <typename UIntType>
-template <typename URBG>
-typename FastUniformBits<UIntType>::result_type
-FastUniformBits<UIntType>::operator()(URBG& g) {  // NOLINT(runtime/references)
-  // kRangeMask is the mask used when sampling variates from the URBG when the
-  // width of the URBG range is not a power of 2.
-  // Y = (2 ^ kRange) - 1
-  static_assert((URBG::max)() > (URBG::min)(),
-                "URBG::max and URBG::min may not be equal.");
-
-  using tag = absl::conditional_t<IsPowerOfTwoOrZero(RangeSize<URBG>()),
-                                  SimplifiedLoopTag, RejectionLoopTag>;
-  return Generate(g, tag{});
-}
-
-template <typename UIntType>
-template <typename URBG>
-typename FastUniformBits<UIntType>::result_type
-FastUniformBits<UIntType>::Generate(URBG& g,  // NOLINT(runtime/references)
-                                    SimplifiedLoopTag) {
-  // The simplified version of FastUniformBits works only on URBGs that have
-  // a range that is a power of 2. In this case we simply loop and shift without
-  // attempting to balance the bits across calls.
-  static_assert(IsPowerOfTwoOrZero(RangeSize<URBG>()),
-                "incorrect Generate tag for URBG instance");
-
-  static constexpr size_t kResultBits =
-      std::numeric_limits<result_type>::digits;
-  static constexpr size_t kUrbgBits = NumBits<URBG>();
-  static constexpr size_t kIters =
-      (kResultBits / kUrbgBits) + (kResultBits % kUrbgBits != 0);
-  static constexpr size_t kShift = (kIters == 1) ? 0 : kUrbgBits;
-  static constexpr auto kMin = (URBG::min)();
-
-  result_type r = static_cast<result_type>(g() - kMin);
-  for (size_t n = 1; n < kIters; ++n) {
-    r = (r << kShift) + static_cast<result_type>(g() - kMin);
-  }
-  return r;
-}
-
-template <typename UIntType>
-template <typename URBG>
-typename FastUniformBits<UIntType>::result_type
-FastUniformBits<UIntType>::Generate(URBG& g,  // NOLINT(runtime/references)
-                                    RejectionLoopTag) {
-  static_assert(!IsPowerOfTwoOrZero(RangeSize<URBG>()),
-                "incorrect Generate tag for URBG instance");
-  using urbg_result_type = typename URBG::result_type;
-
-  // See [rand.adapt.ibits] for more details on the constants calculated below.
-  //
-  // It is preferable to use roughly the same number of bits from each generator
-  // call, however this is only possible when the number of bits provided by the
-  // URBG is a divisor of the number of bits in `result_type`. In all other
-  // cases, the number of bits used cannot always be the same, but it can be
-  // guaranteed to be off by at most 1. Thus we run two loops, one with a
-  // smaller bit-width size (`kSmallWidth`) and one with a larger width size
-  // (satisfying `kLargeWidth == kSmallWidth + 1`). The loops are run
-  // `kSmallIters` and `kLargeIters` times respectively such
-  // that
-  //
-  //    `kResultBits == kSmallIters * kSmallBits
-  //                    + kLargeIters * kLargeBits`
-  //
-  // where `kResultBits` is the total number of bits in `result_type`.
-  //
-  static constexpr size_t kResultBits =
-      std::numeric_limits<result_type>::digits;                      // w
-  static constexpr urbg_result_type kUrbgRange = RangeSize<URBG>();  // R
-  static constexpr size_t kUrbgBits = NumBits<URBG>();               // m
-
-  // compute the initial estimate of the bits used.
-  // [rand.adapt.ibits] 2 (c)
-  static constexpr size_t kA =  // ceil(w/m)
-      (kResultBits / kUrbgBits) + ((kResultBits % kUrbgBits) != 0);  // n'
-
-  static constexpr size_t kABits = kResultBits / kA;  // w0'
-  static constexpr urbg_result_type kARejection =
-      ((kUrbgRange >> kABits) << kABits);  // y0'
-
-  // refine the selection to reduce the rejection frequency.
-  static constexpr size_t kTotalIters =
-      ((kUrbgRange - kARejection) <= (kARejection / kA)) ? kA : (kA + 1);  // n
-
-  // [rand.adapt.ibits] 2 (b)
-  static constexpr size_t kSmallIters =
-      kTotalIters - (kResultBits % kTotalIters);                   // n0
-  static constexpr size_t kSmallBits = kResultBits / kTotalIters;  // w0
-  static constexpr urbg_result_type kSmallRejection =
-      ((kUrbgRange >> kSmallBits) << kSmallBits);  // y0
-
-  static constexpr size_t kLargeBits = kSmallBits + 1;  // w0+1
-  static constexpr urbg_result_type kLargeRejection =
-      ((kUrbgRange >> kLargeBits) << kLargeBits);  // y1
-
-  //
-  // Because `kLargeBits == kSmallBits + 1`, it follows that
-  //
-  //     `kResultBits == kSmallIters * kSmallBits + kLargeIters`
-  //
-  // and therefore
-  //
-  //     `kLargeIters == kTotalWidth % kSmallWidth`
-  //
-  // Intuitively, each iteration with the large width accounts for one unit
-  // of the remainder when `kTotalWidth` is divided by `kSmallWidth`. As
-  // mentioned above, if the URBG width is a divisor of `kTotalWidth`, then
-  // there would be no need for any large iterations (i.e., one loop would
-  // suffice), and indeed, in this case, `kLargeIters` would be zero.
-  static_assert(kResultBits == kSmallIters * kSmallBits +
-                                   (kTotalIters - kSmallIters) * kLargeBits,
-                "Error in looping constant calculations.");
-
-  // The small shift is essentially small bits, but due to the potential
-  // of generating a smaller result_type from a larger urbg type, the actual
-  // shift might be 0.
-  static constexpr size_t kSmallShift = kSmallBits % kResultBits;
-  static constexpr auto kSmallMask =
-      MaskFromShift<urbg_result_type>(kSmallShift);
-  static constexpr size_t kLargeShift = kLargeBits % kResultBits;
-  static constexpr auto kLargeMask =
-      MaskFromShift<urbg_result_type>(kLargeShift);
-
-  static constexpr auto kMin = (URBG::min)();
-
-  result_type s = 0;
-  for (size_t n = 0; n < kSmallIters; ++n) {
-    urbg_result_type v;
-    do {
-      v = g() - kMin;
-    } while (v >= kSmallRejection);
-
-    s = (s << kSmallShift) + static_cast<result_type>(v & kSmallMask);
-  }
-
-  for (size_t n = kSmallIters; n < kTotalIters; ++n) {
-    urbg_result_type v;
-    do {
-      v = g() - kMin;
-    } while (v >= kLargeRejection);
-
-    s = (s << kLargeShift) + static_cast<result_type>(v & kLargeMask);
-  }
-  return s;
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_FAST_UNIFORM_BITS_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/fast_uniform_bits_test.cc b/third_party/abseil_cpp/absl/random/internal/fast_uniform_bits_test.cc
deleted file mode 100644
index cee702df852d..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/fast_uniform_bits_test.cc
+++ /dev/null
@@ -1,336 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/fast_uniform_bits.h"
-
-#include <random>
-
-#include "gtest/gtest.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-
-template <typename IntType>
-class FastUniformBitsTypedTest : public ::testing::Test {};
-
-using IntTypes = ::testing::Types<uint8_t, uint16_t, uint32_t, uint64_t>;
-
-TYPED_TEST_SUITE(FastUniformBitsTypedTest, IntTypes);
-
-TYPED_TEST(FastUniformBitsTypedTest, BasicTest) {
-  using Limits = std::numeric_limits<TypeParam>;
-  using FastBits = FastUniformBits<TypeParam>;
-
-  EXPECT_EQ(0, (FastBits::min)());
-  EXPECT_EQ((Limits::max)(), (FastBits::max)());
-
-  constexpr int kIters = 10000;
-  std::random_device rd;
-  std::mt19937 gen(rd());
-  FastBits fast;
-  for (int i = 0; i < kIters; i++) {
-    const auto v = fast(gen);
-    EXPECT_LE(v, (FastBits::max)());
-    EXPECT_GE(v, (FastBits::min)());
-  }
-}
-
-template <typename UIntType, UIntType Lo, UIntType Hi, UIntType Val = Lo>
-struct FakeUrbg {
-  using result_type = UIntType;
-
-  FakeUrbg() = default;
-  explicit FakeUrbg(bool r) : reject(r) {}
-
-  static constexpr result_type(max)() { return Hi; }
-  static constexpr result_type(min)() { return Lo; }
-  result_type operator()() {
-    // when reject is set, return Hi half the time.
-    return ((++calls % 2) == 1 && reject) ? Hi : Val;
-  }
-
-  bool reject = false;
-  size_t calls = 0;
-};
-
-TEST(FastUniformBitsTest, IsPowerOfTwoOrZero) {
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{0}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{1}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{2}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint8_t{3}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{4}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{16}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint8_t{17}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint8_t>::max)()));
-
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{0}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{1}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{2}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint16_t{3}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{4}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{16}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint16_t{17}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint16_t>::max)()));
-
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{0}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{1}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{2}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint32_t{3}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{32}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint32_t{17}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint32_t>::max)()));
-
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{0}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{1}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{2}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint64_t{3}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{4}));
-  EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{64}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero(uint64_t{17}));
-  EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint64_t>::max)()));
-}
-
-TEST(FastUniformBitsTest, IntegerLog2) {
-  EXPECT_EQ(0, IntegerLog2(uint16_t{0}));
-  EXPECT_EQ(0, IntegerLog2(uint16_t{1}));
-  EXPECT_EQ(1, IntegerLog2(uint16_t{2}));
-  EXPECT_EQ(1, IntegerLog2(uint16_t{3}));
-  EXPECT_EQ(2, IntegerLog2(uint16_t{4}));
-  EXPECT_EQ(2, IntegerLog2(uint16_t{5}));
-  EXPECT_EQ(2, IntegerLog2(uint16_t{7}));
-  EXPECT_EQ(3, IntegerLog2(uint16_t{8}));
-  EXPECT_EQ(63, IntegerLog2((std::numeric_limits<uint64_t>::max)()));
-}
-
-TEST(FastUniformBitsTest, RangeSize) {
-  EXPECT_EQ(2, (RangeSize<FakeUrbg<uint8_t, 0, 1>>()));
-  EXPECT_EQ(3, (RangeSize<FakeUrbg<uint8_t, 0, 2>>()));
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint8_t, 0, 3>>()));
-  //  EXPECT_EQ(0, (RangeSize<FakeUrbg<uint8_t, 2, 2>>()));
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint8_t, 2, 5>>()));
-  EXPECT_EQ(5, (RangeSize<FakeUrbg<uint8_t, 2, 6>>()));
-  EXPECT_EQ(9, (RangeSize<FakeUrbg<uint8_t, 2, 10>>()));
-  EXPECT_EQ(
-      0, (RangeSize<
-             FakeUrbg<uint8_t, 0, (std::numeric_limits<uint8_t>::max)()>>()));
-
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint16_t, 0, 3>>()));
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint16_t, 2, 5>>()));
-  EXPECT_EQ(5, (RangeSize<FakeUrbg<uint16_t, 2, 6>>()));
-  EXPECT_EQ(18, (RangeSize<FakeUrbg<uint16_t, 1000, 1017>>()));
-  EXPECT_EQ(
-      0, (RangeSize<
-             FakeUrbg<uint16_t, 0, (std::numeric_limits<uint16_t>::max)()>>()));
-
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint32_t, 0, 3>>()));
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint32_t, 2, 5>>()));
-  EXPECT_EQ(5, (RangeSize<FakeUrbg<uint32_t, 2, 6>>()));
-  EXPECT_EQ(18, (RangeSize<FakeUrbg<uint32_t, 1000, 1017>>()));
-  EXPECT_EQ(0, (RangeSize<FakeUrbg<uint32_t, 0, 0xffffffff>>()));
-  EXPECT_EQ(0xffffffff, (RangeSize<FakeUrbg<uint32_t, 1, 0xffffffff>>()));
-  EXPECT_EQ(0xfffffffe, (RangeSize<FakeUrbg<uint32_t, 1, 0xfffffffe>>()));
-  EXPECT_EQ(0xfffffffd, (RangeSize<FakeUrbg<uint32_t, 2, 0xfffffffe>>()));
-  EXPECT_EQ(
-      0, (RangeSize<
-             FakeUrbg<uint32_t, 0, (std::numeric_limits<uint32_t>::max)()>>()));
-
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint64_t, 0, 3>>()));
-  EXPECT_EQ(4, (RangeSize<FakeUrbg<uint64_t, 2, 5>>()));
-  EXPECT_EQ(5, (RangeSize<FakeUrbg<uint64_t, 2, 6>>()));
-  EXPECT_EQ(18, (RangeSize<FakeUrbg<uint64_t, 1000, 1017>>()));
-  EXPECT_EQ(0x100000000, (RangeSize<FakeUrbg<uint64_t, 0, 0xffffffff>>()));
-  EXPECT_EQ(0xffffffff, (RangeSize<FakeUrbg<uint64_t, 1, 0xffffffff>>()));
-  EXPECT_EQ(0xfffffffe, (RangeSize<FakeUrbg<uint64_t, 1, 0xfffffffe>>()));
-  EXPECT_EQ(0xfffffffd, (RangeSize<FakeUrbg<uint64_t, 2, 0xfffffffe>>()));
-  EXPECT_EQ(0, (RangeSize<FakeUrbg<uint64_t, 0, 0xffffffffffffffff>>()));
-  EXPECT_EQ(0xffffffffffffffff,
-            (RangeSize<FakeUrbg<uint64_t, 1, 0xffffffffffffffff>>()));
-  EXPECT_EQ(0xfffffffffffffffe,
-            (RangeSize<FakeUrbg<uint64_t, 1, 0xfffffffffffffffe>>()));
-  EXPECT_EQ(0xfffffffffffffffd,
-            (RangeSize<FakeUrbg<uint64_t, 2, 0xfffffffffffffffe>>()));
-  EXPECT_EQ(
-      0, (RangeSize<
-             FakeUrbg<uint64_t, 0, (std::numeric_limits<uint64_t>::max)()>>()));
-}
-
-// The constants need to be choosen so that an infinite rejection loop doesn't
-// happen...
-using Urng1_5bit = FakeUrbg<uint8_t, 0, 2, 0>;  // ~1.5 bits (range 3)
-using Urng4bits = FakeUrbg<uint8_t, 1, 0x10, 2>;
-using Urng22bits = FakeUrbg<uint32_t, 0, 0x3fffff, 0x301020>;
-using Urng31bits = FakeUrbg<uint32_t, 1, 0xfffffffe, 0x60070f03>;  // ~31.9 bits
-using Urng32bits = FakeUrbg<uint32_t, 0, 0xffffffff, 0x74010f01>;
-using Urng33bits =
-    FakeUrbg<uint64_t, 1, 0x1ffffffff, 0x013301033>;  // ~32.9 bits
-using Urng63bits = FakeUrbg<uint64_t, 1, 0xfffffffffffffffe,
-                            0xfedcba9012345678>;  // ~63.9 bits
-using Urng64bits =
-    FakeUrbg<uint64_t, 0, 0xffffffffffffffff, 0x123456780fedcba9>;
-
-TEST(FastUniformBitsTest, OutputsUpTo32Bits) {
-  // Tests that how values are composed; the single-bit deltas should be spread
-  // across each invocation.
-  Urng1_5bit urng1_5;
-  Urng4bits urng4;
-  Urng22bits urng22;
-  Urng31bits urng31;
-  Urng32bits urng32;
-  Urng33bits urng33;
-  Urng63bits urng63;
-  Urng64bits urng64;
-
-  // 8-bit types
-  {
-    FastUniformBits<uint8_t> fast8;
-    EXPECT_EQ(0x0, fast8(urng1_5));
-    EXPECT_EQ(0x11, fast8(urng4));
-    EXPECT_EQ(0x20, fast8(urng22));
-    EXPECT_EQ(0x2, fast8(urng31));
-    EXPECT_EQ(0x1, fast8(urng32));
-    EXPECT_EQ(0x32, fast8(urng33));
-    EXPECT_EQ(0x77, fast8(urng63));
-    EXPECT_EQ(0xa9, fast8(urng64));
-  }
-
-  // 16-bit types
-  {
-    FastUniformBits<uint16_t> fast16;
-    EXPECT_EQ(0x0, fast16(urng1_5));
-    EXPECT_EQ(0x1111, fast16(urng4));
-    EXPECT_EQ(0x1020, fast16(urng22));
-    EXPECT_EQ(0x0f02, fast16(urng31));
-    EXPECT_EQ(0x0f01, fast16(urng32));
-    EXPECT_EQ(0x1032, fast16(urng33));
-    EXPECT_EQ(0x5677, fast16(urng63));
-    EXPECT_EQ(0xcba9, fast16(urng64));
-  }
-
-  // 32-bit types
-  {
-    FastUniformBits<uint32_t> fast32;
-    EXPECT_EQ(0x0, fast32(urng1_5));
-    EXPECT_EQ(0x11111111, fast32(urng4));
-    EXPECT_EQ(0x08301020, fast32(urng22));
-    EXPECT_EQ(0x0f020f02, fast32(urng31));
-    EXPECT_EQ(0x74010f01, fast32(urng32));
-    EXPECT_EQ(0x13301032, fast32(urng33));
-    EXPECT_EQ(0x12345677, fast32(urng63));
-    EXPECT_EQ(0x0fedcba9, fast32(urng64));
-  }
-}
-
-TEST(FastUniformBitsTest, Outputs64Bits) {
-  // Tests that how values are composed; the single-bit deltas should be spread
-  // across each invocation.
-  FastUniformBits<uint64_t> fast64;
-
-  {
-    FakeUrbg<uint8_t, 0, 1, 0> urng0;
-    FakeUrbg<uint8_t, 0, 1, 1> urng1;
-    Urng4bits urng4;
-    Urng22bits urng22;
-    Urng31bits urng31;
-    Urng32bits urng32;
-    Urng33bits urng33;
-    Urng63bits urng63;
-    Urng64bits urng64;
-
-    // somewhat degenerate cases only create a single bit.
-    EXPECT_EQ(0x0, fast64(urng0));
-    EXPECT_EQ(64, urng0.calls);
-    EXPECT_EQ(0xffffffffffffffff, fast64(urng1));
-    EXPECT_EQ(64, urng1.calls);
-
-    // less degenerate cases.
-    EXPECT_EQ(0x1111111111111111, fast64(urng4));
-    EXPECT_EQ(16, urng4.calls);
-    EXPECT_EQ(0x01020c0408301020, fast64(urng22));
-    EXPECT_EQ(3, urng22.calls);
-    EXPECT_EQ(0x387811c3c0870f02, fast64(urng31));
-    EXPECT_EQ(3, urng31.calls);
-    EXPECT_EQ(0x74010f0174010f01, fast64(urng32));
-    EXPECT_EQ(2, urng32.calls);
-    EXPECT_EQ(0x808194040cb01032, fast64(urng33));
-    EXPECT_EQ(3, urng33.calls);
-    EXPECT_EQ(0x1234567712345677, fast64(urng63));
-    EXPECT_EQ(2, urng63.calls);
-    EXPECT_EQ(0x123456780fedcba9, fast64(urng64));
-    EXPECT_EQ(1, urng64.calls);
-  }
-
-  // The 1.5 bit case is somewhat interesting in that the algorithm refinement
-  // causes one extra small sample. Comments here reference the names used in
-  // [rand.adapt.ibits] that correspond to this case.
-  {
-    Urng1_5bit urng1_5;
-
-    // w = 64
-    // R = 3
-    // m = 1
-    // n' = 64
-    // w0' = 1
-    // y0' = 2
-    // n = (1 <= 0) > 64 : 65 = 65
-    // n0 = 65 - (64%65) = 1
-    // n1 = 64
-    // w0 = 0
-    // y0 = 3
-    // w1 = 1
-    // y1 = 2
-    EXPECT_EQ(0x0, fast64(urng1_5));
-    EXPECT_EQ(65, urng1_5.calls);
-  }
-
-  // Validate rejections for non-power-of-2 cases.
-  {
-    Urng1_5bit urng1_5(true);
-    Urng31bits urng31(true);
-    Urng33bits urng33(true);
-    Urng63bits urng63(true);
-
-    // For 1.5 bits, there would be 1+2*64, except the first
-    // value was accepted and shifted off the end.
-    EXPECT_EQ(0, fast64(urng1_5));
-    EXPECT_EQ(128, urng1_5.calls);
-    EXPECT_EQ(0x387811c3c0870f02, fast64(urng31));
-    EXPECT_EQ(6, urng31.calls);
-    EXPECT_EQ(0x808194040cb01032, fast64(urng33));
-    EXPECT_EQ(6, urng33.calls);
-    EXPECT_EQ(0x1234567712345677, fast64(urng63));
-    EXPECT_EQ(4, urng63.calls);
-  }
-}
-
-TEST(FastUniformBitsTest, URBG32bitRegression) {
-  // Validate with deterministic 32-bit std::minstd_rand
-  // to ensure that operator() performs as expected.
-
-  EXPECT_EQ(2147483646, RangeSize<std::minstd_rand>());
-  EXPECT_EQ(30, IntegerLog2(RangeSize<std::minstd_rand>()));
-
-  std::minstd_rand gen(1);
-  FastUniformBits<uint64_t> fast64;
-
-  EXPECT_EQ(0x05e47095f8791f45, fast64(gen));
-  EXPECT_EQ(0x028be17e3c07c122, fast64(gen));
-  EXPECT_EQ(0x55d2847c1626e8c2, fast64(gen));
-}
-
-}  // namespace
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/fastmath.h b/third_party/abseil_cpp/absl/random/internal/fastmath.h
deleted file mode 100644
index 6baeb5a7c917..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/fastmath.h
+++ /dev/null
@@ -1,74 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_FASTMATH_H_
-#define ABSL_RANDOM_INTERNAL_FASTMATH_H_
-
-// This file contains fast math functions (bitwise ops as well as some others)
-// which are implementation details of various absl random number distributions.
-
-#include <cassert>
-#include <cmath>
-#include <cstdint>
-
-#include "absl/base/internal/bits.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// Returns the position of the first bit set.
-inline int LeadingSetBit(uint64_t n) {
-  return 64 - base_internal::CountLeadingZeros64(n);
-}
-
-// Compute log2(n) using integer operations.
-// While std::log2 is more accurate than std::log(n) / std::log(2), for
-// very large numbers--those close to std::numeric_limits<uint64_t>::max() - 2,
-// for instance--std::log2 rounds up rather than down, which introduces
-// definite skew in the results.
-inline int IntLog2Floor(uint64_t n) {
-  return (n <= 1) ? 0 : (63 - base_internal::CountLeadingZeros64(n));
-}
-inline int IntLog2Ceil(uint64_t n) {
-  return (n <= 1) ? 0 : (64 - base_internal::CountLeadingZeros64(n - 1));
-}
-
-inline double StirlingLogFactorial(double n) {
-  assert(n >= 1);
-  // Using Stirling's approximation.
-  constexpr double kLog2PI = 1.83787706640934548356;
-  const double logn = std::log(n);
-  const double ninv = 1.0 / static_cast<double>(n);
-  return n * logn - n + 0.5 * (kLog2PI + logn) + (1.0 / 12.0) * ninv -
-         (1.0 / 360.0) * ninv * ninv * ninv;
-}
-
-// Rotate value right.
-//
-// We only implement the uint32_t / uint64_t versions because
-// 1) those are the only ones we use, and
-// 2) those are the only ones where clang detects the rotate idiom correctly.
-inline constexpr uint32_t rotr(uint32_t value, uint8_t bits) {
-  return (value >> (bits & 31)) | (value << ((-bits) & 31));
-}
-inline constexpr uint64_t rotr(uint64_t value, uint8_t bits) {
-  return (value >> (bits & 63)) | (value << ((-bits) & 63));
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_FASTMATH_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/fastmath_test.cc b/third_party/abseil_cpp/absl/random/internal/fastmath_test.cc
deleted file mode 100644
index 65859c25de4c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/fastmath_test.cc
+++ /dev/null
@@ -1,110 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/fastmath.h"
-
-#include "gtest/gtest.h"
-
-#if defined(__native_client__) || defined(__EMSCRIPTEN__)
-// NACL has a less accurate implementation of std::log2 than most of
-// the other platforms. For some values which should have integral results,
-// sometimes NACL returns slightly larger values.
-//
-// The MUSL libc used by emscripten also has a similar bug.
-#define ABSL_RANDOM_INACCURATE_LOG2
-#endif
-
-namespace {
-
-TEST(DistributionImplTest, LeadingSetBit) {
-  using absl::random_internal::LeadingSetBit;
-  constexpr uint64_t kZero = 0;
-  EXPECT_EQ(0, LeadingSetBit(kZero));
-  EXPECT_EQ(64, LeadingSetBit(~kZero));
-
-  for (int index = 0; index < 64; index++) {
-    uint64_t x = static_cast<uint64_t>(1) << index;
-    EXPECT_EQ(index + 1, LeadingSetBit(x)) << index;
-    EXPECT_EQ(index + 1, LeadingSetBit(x + x - 1)) << index;
-  }
-}
-
-TEST(FastMathTest, IntLog2FloorTest) {
-  using absl::random_internal::IntLog2Floor;
-  constexpr uint64_t kZero = 0;
-  EXPECT_EQ(0, IntLog2Floor(0));  // boundary. return 0.
-  EXPECT_EQ(0, IntLog2Floor(1));
-  EXPECT_EQ(1, IntLog2Floor(2));
-  EXPECT_EQ(63, IntLog2Floor(~kZero));
-
-  // A boundary case: Converting 0xffffffffffffffff requires > 53
-  // bits of precision, so the conversion to double rounds up,
-  // and the result of std::log2(x) > IntLog2Floor(x).
-  EXPECT_LT(IntLog2Floor(~kZero), static_cast<int>(std::log2(~kZero)));
-
-  for (int i = 0; i < 64; i++) {
-    const uint64_t i_pow_2 = static_cast<uint64_t>(1) << i;
-    EXPECT_EQ(i, IntLog2Floor(i_pow_2));
-    EXPECT_EQ(i, static_cast<int>(std::log2(i_pow_2)));
-
-    uint64_t y = i_pow_2;
-    for (int j = i - 1; j > 0; --j) {
-      y = y | (i_pow_2 >> j);
-      EXPECT_EQ(i, IntLog2Floor(y));
-    }
-  }
-}
-
-TEST(FastMathTest, IntLog2CeilTest) {
-  using absl::random_internal::IntLog2Ceil;
-  constexpr uint64_t kZero = 0;
-  EXPECT_EQ(0, IntLog2Ceil(0));  // boundary. return 0.
-  EXPECT_EQ(0, IntLog2Ceil(1));
-  EXPECT_EQ(1, IntLog2Ceil(2));
-  EXPECT_EQ(64, IntLog2Ceil(~kZero));
-
-  // A boundary case: Converting 0xffffffffffffffff requires > 53
-  // bits of precision, so the conversion to double rounds up,
-  // and the result of std::log2(x) > IntLog2Floor(x).
-  EXPECT_LE(IntLog2Ceil(~kZero), static_cast<int>(std::log2(~kZero)));
-
-  for (int i = 0; i < 64; i++) {
-    const uint64_t i_pow_2 = static_cast<uint64_t>(1) << i;
-    EXPECT_EQ(i, IntLog2Ceil(i_pow_2));
-#ifndef ABSL_RANDOM_INACCURATE_LOG2
-    EXPECT_EQ(i, static_cast<int>(std::ceil(std::log2(i_pow_2))));
-#endif
-
-    uint64_t y = i_pow_2;
-    for (int j = i - 1; j > 0; --j) {
-      y = y | (i_pow_2 >> j);
-      EXPECT_EQ(i + 1, IntLog2Ceil(y));
-    }
-  }
-}
-
-TEST(FastMathTest, StirlingLogFactorial) {
-  using absl::random_internal::StirlingLogFactorial;
-
-  EXPECT_NEAR(StirlingLogFactorial(1.0), 0, 1e-3);
-  EXPECT_NEAR(StirlingLogFactorial(1.50), 0.284683, 1e-3);
-  EXPECT_NEAR(StirlingLogFactorial(2.0), 0.69314718056, 1e-4);
-
-  for (int i = 2; i < 50; i++) {
-    double d = static_cast<double>(i);
-    EXPECT_NEAR(StirlingLogFactorial(d), std::lgamma(d + 1), 3e-5);
-  }
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/gaussian_distribution_gentables.cc b/third_party/abseil_cpp/absl/random/internal/gaussian_distribution_gentables.cc
deleted file mode 100644
index a95333d55f55..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/gaussian_distribution_gentables.cc
+++ /dev/null
@@ -1,143 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Generates gaussian_distribution.cc
-//
-// $ blaze run :gaussian_distribution_gentables > gaussian_distribution.cc
-//
-#include "absl/random/gaussian_distribution.h"
-
-#include <cmath>
-#include <cstddef>
-#include <iostream>
-#include <limits>
-#include <string>
-
-#include "absl/base/macros.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-
-template <typename T, size_t N>
-void FormatArrayContents(std::ostream* os, T (&data)[N]) {
-  if (!std::numeric_limits<T>::is_exact) {
-    // Note: T is either an integer or a float.
-    // float requires higher precision to ensure that values are
-    // reproduced exactly.
-    // Trivia: C99 has hexadecimal floating point literals, but C++11 does not.
-    // Using them would remove all concern of precision loss.
-    os->precision(std::numeric_limits<T>::max_digits10 + 2);
-  }
-  *os << "    {";
-  std::string separator = "";
-  for (size_t i = 0; i < N; ++i) {
-    *os << separator << data[i];
-    if ((i + 1) % 3 != 0) {
-      separator = ", ";
-    } else {
-      separator = ",\n     ";
-    }
-  }
-  *os << "}";
-}
-
-}  // namespace
-
-class TableGenerator : public gaussian_distribution_base {
- public:
-  TableGenerator();
-  void Print(std::ostream* os);
-
-  using gaussian_distribution_base::kMask;
-  using gaussian_distribution_base::kR;
-  using gaussian_distribution_base::kV;
-
- private:
-  Tables tables_;
-};
-
-// Ziggurat gaussian initialization.  For an explanation of the algorithm, see
-// the Marsaglia paper, "The Ziggurat Method for Generating Random Variables".
-//   http://www.jstatsoft.org/v05/i08/
-//
-// Further details are available in the Doornik paper
-//   https://www.doornik.com/research/ziggurat.pdf
-//
-TableGenerator::TableGenerator() {
-  // The constants here should match the values in gaussian_distribution.h
-  static constexpr int kC = kMask + 1;
-
-  static_assert((ABSL_ARRAYSIZE(tables_.x) == kC + 1),
-                "xArray must be length kMask + 2");
-
-  static_assert((ABSL_ARRAYSIZE(tables_.x) == ABSL_ARRAYSIZE(tables_.f)),
-                "fx and x arrays must be identical length");
-
-  auto f = [](double x) { return std::exp(-0.5 * x * x); };
-  auto f_inv = [](double x) { return std::sqrt(-2.0 * std::log(x)); };
-
-  tables_.x[0] = kV / f(kR);
-  tables_.f[0] = f(tables_.x[0]);
-
-  tables_.x[1] = kR;
-  tables_.f[1] = f(tables_.x[1]);
-
-  tables_.x[kC] = 0.0;
-  tables_.f[kC] = f(tables_.x[kC]);  // 1.0
-
-  for (int i = 2; i < kC; i++) {
-    double v = (kV / tables_.x[i - 1]) + tables_.f[i - 1];
-    tables_.x[i] = f_inv(v);
-    tables_.f[i] = v;
-  }
-}
-
-void TableGenerator::Print(std::ostream* os) {
-  *os << "// BEGIN GENERATED CODE; DO NOT EDIT\n"
-         "// clang-format off\n"
-         "\n"
-         "#include \"absl/random/gaussian_distribution.h\"\n"
-         "\n"
-         "namespace absl {\n"
-         "ABSL_NAMESPACE_BEGIN\n"
-         "namespace random_internal {\n"
-         "\n"
-         "const gaussian_distribution_base::Tables\n"
-         "    gaussian_distribution_base::zg_ = {\n";
-  FormatArrayContents(os, tables_.x);
-  *os << ",\n";
-  FormatArrayContents(os, tables_.f);
-  *os << "};\n"
-         "\n"
-         "}  // namespace random_internal\n"
-         "ABSL_NAMESPACE_END\n"
-         "}  // namespace absl\n"
-         "\n"
-         "// clang-format on\n"
-         "// END GENERATED CODE";
-  *os << std::endl;
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-int main(int, char**) {
-  std::cerr << "\nCopy the output to gaussian_distribution.cc" << std::endl;
-  absl::random_internal::TableGenerator generator;
-  generator.Print(&std::cout);
-  return 0;
-}
diff --git a/third_party/abseil_cpp/absl/random/internal/generate_real.h b/third_party/abseil_cpp/absl/random/internal/generate_real.h
deleted file mode 100644
index 20f6d20807d5..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/generate_real.h
+++ /dev/null
@@ -1,146 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_GENERATE_REAL_H_
-#define ABSL_RANDOM_INTERNAL_GENERATE_REAL_H_
-
-// This file contains some implementation details which are used by one or more
-// of the absl random number distributions.
-
-#include <cstdint>
-#include <cstring>
-#include <limits>
-#include <type_traits>
-
-#include "absl/base/internal/bits.h"
-#include "absl/meta/type_traits.h"
-#include "absl/random/internal/fastmath.h"
-#include "absl/random/internal/traits.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// Tristate tag types controlling the output of GenerateRealFromBits.
-struct GeneratePositiveTag {};
-struct GenerateNegativeTag {};
-struct GenerateSignedTag {};
-
-// GenerateRealFromBits generates a single real value from a single 64-bit
-// `bits` with template fields controlling the output.
-//
-// The `SignedTag` parameter controls whether positive, negative,
-// or either signed/unsigned may be returned.
-//   When SignedTag == GeneratePositiveTag, range is U(0, 1)
-//   When SignedTag == GenerateNegativeTag, range is U(-1, 0)
-//   When SignedTag == GenerateSignedTag, range is U(-1, 1)
-//
-// When the `IncludeZero` parameter is true, the function may return 0 for some
-// inputs, otherwise it never returns 0.
-//
-// When a value in U(0,1) is required, use:
-//   Uniform64ToReal<double, PositiveValueT, true>;
-//
-// When a value in U(-1,1) is required, use:
-//   Uniform64ToReal<double, SignedValueT, false>;
-//
-//   This generates more distinct values than the mathematical equivalent
-//   `U(0, 1) * 2.0 - 1.0`.
-//
-// Scaling the result by powers of 2 (and avoiding a multiply) is also possible:
-//   GenerateRealFromBits<double>(..., -1);  => U(0, 0.5)
-//   GenerateRealFromBits<double>(..., 1);   => U(0, 2)
-//
-template <typename RealType,  // Real type, either float or double.
-          typename SignedTag = GeneratePositiveTag,  // Whether a positive,
-                                                     // negative, or signed
-                                                     // value is generated.
-          bool IncludeZero = true>
-inline RealType GenerateRealFromBits(uint64_t bits, int exp_bias = 0) {
-  using real_type = RealType;
-  using uint_type = absl::conditional_t<std::is_same<real_type, float>::value,
-                                        uint32_t, uint64_t>;
-
-  static_assert(
-      (std::is_same<double, real_type>::value ||
-       std::is_same<float, real_type>::value),
-      "GenerateRealFromBits must be parameterized by either float or double.");
-
-  static_assert(sizeof(uint_type) == sizeof(real_type),
-                "Mismatched unsinged and real types.");
-
-  static_assert((std::numeric_limits<real_type>::is_iec559 &&
-                 std::numeric_limits<real_type>::radix == 2),
-                "RealType representation is not IEEE 754 binary.");
-
-  static_assert((std::is_same<SignedTag, GeneratePositiveTag>::value ||
-                 std::is_same<SignedTag, GenerateNegativeTag>::value ||
-                 std::is_same<SignedTag, GenerateSignedTag>::value),
-                "");
-
-  static constexpr int kExp = std::numeric_limits<real_type>::digits - 1;
-  static constexpr uint_type kMask = (static_cast<uint_type>(1) << kExp) - 1u;
-  static constexpr int kUintBits = sizeof(uint_type) * 8;
-
-  int exp = exp_bias + int{std::numeric_limits<real_type>::max_exponent - 2};
-
-  // Determine the sign bit.
-  // Depending on the SignedTag, this may use the left-most bit
-  // or it may be a constant value.
-  uint_type sign = std::is_same<SignedTag, GenerateNegativeTag>::value
-                       ? (static_cast<uint_type>(1) << (kUintBits - 1))
-                       : 0;
-  if (std::is_same<SignedTag, GenerateSignedTag>::value) {
-    if (std::is_same<uint_type, uint64_t>::value) {
-      sign = bits & uint64_t{0x8000000000000000};
-    }
-    if (std::is_same<uint_type, uint32_t>::value) {
-      const uint64_t tmp = bits & uint64_t{0x8000000000000000};
-      sign = static_cast<uint32_t>(tmp >> 32);
-    }
-    // adjust the bits and the exponent to account for removing
-    // the leading bit.
-    bits = bits & uint64_t{0x7FFFFFFFFFFFFFFF};
-    exp++;
-  }
-  if (IncludeZero) {
-    if (bits == 0u) return 0;
-  }
-
-  // Number of leading zeros is mapped to the exponent: 2^-clz
-  // bits is 0..01xxxxxx. After shifting, we're left with 1xxx...0..0
-  int clz = base_internal::CountLeadingZeros64(bits);
-  bits <<= (IncludeZero ? clz : (clz & 63));  // remove 0-bits.
-  exp -= clz;                                 // set the exponent.
-  bits >>= (63 - kExp);
-
-  // Construct the 32-bit or 64-bit IEEE 754 floating-point value from
-  // the individual fields: sign, exp, mantissa(bits).
-  uint_type val =
-      (std::is_same<SignedTag, GeneratePositiveTag>::value ? 0u : sign) |
-      (static_cast<uint_type>(exp) << kExp) |
-      (static_cast<uint_type>(bits) & kMask);
-
-  // bit_cast to the output-type
-  real_type result;
-  memcpy(static_cast<void*>(&result), static_cast<const void*>(&val),
-         sizeof(result));
-  return result;
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_GENERATE_REAL_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/generate_real_test.cc b/third_party/abseil_cpp/absl/random/internal/generate_real_test.cc
deleted file mode 100644
index 4bdc453483e4..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/generate_real_test.cc
+++ /dev/null
@@ -1,497 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/generate_real.h"
-
-#include <cfloat>
-#include <cstddef>
-#include <cstdint>
-#include <string>
-
-#include "gtest/gtest.h"
-#include "absl/base/internal/bits.h"
-#include "absl/flags/flag.h"
-
-ABSL_FLAG(int64_t, absl_random_test_trials, 50000,
-          "Number of trials for the probability tests.");
-
-using absl::random_internal::GenerateNegativeTag;
-using absl::random_internal::GeneratePositiveTag;
-using absl::random_internal::GenerateRealFromBits;
-using absl::random_internal::GenerateSignedTag;
-
-namespace {
-
-TEST(GenerateRealTest, U64ToFloat_Positive_NoZero_Test) {
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GeneratePositiveTag, false>(a);
-  };
-  EXPECT_EQ(ToFloat(0x0000000000000000), 2.710505431e-20f);
-  EXPECT_EQ(ToFloat(0x0000000000000001), 5.421010862e-20f);
-  EXPECT_EQ(ToFloat(0x8000000000000000), 0.5);
-  EXPECT_EQ(ToFloat(0x8000000000000001), 0.5);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 0.9999999404f);
-}
-
-TEST(GenerateRealTest, U64ToFloat_Positive_Zero_Test) {
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GeneratePositiveTag, true>(a);
-  };
-  EXPECT_EQ(ToFloat(0x0000000000000000), 0.0);
-  EXPECT_EQ(ToFloat(0x0000000000000001), 5.421010862e-20f);
-  EXPECT_EQ(ToFloat(0x8000000000000000), 0.5);
-  EXPECT_EQ(ToFloat(0x8000000000000001), 0.5);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 0.9999999404f);
-}
-
-TEST(GenerateRealTest, U64ToFloat_Negative_NoZero_Test) {
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GenerateNegativeTag, false>(a);
-  };
-  EXPECT_EQ(ToFloat(0x0000000000000000), -2.710505431e-20f);
-  EXPECT_EQ(ToFloat(0x0000000000000001), -5.421010862e-20f);
-  EXPECT_EQ(ToFloat(0x8000000000000000), -0.5);
-  EXPECT_EQ(ToFloat(0x8000000000000001), -0.5);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
-}
-
-TEST(GenerateRealTest, U64ToFloat_Negative_Zero_Test) {
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GenerateNegativeTag, true>(a);
-  };
-  EXPECT_EQ(ToFloat(0x0000000000000000), 0.0);
-  EXPECT_EQ(ToFloat(0x0000000000000001), -5.421010862e-20f);
-  EXPECT_EQ(ToFloat(0x8000000000000000), -0.5);
-  EXPECT_EQ(ToFloat(0x8000000000000001), -0.5);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
-}
-
-TEST(GenerateRealTest, U64ToFloat_Signed_NoZero_Test) {
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GenerateSignedTag, false>(a);
-  };
-  EXPECT_EQ(ToFloat(0x0000000000000000), 5.421010862e-20f);
-  EXPECT_EQ(ToFloat(0x0000000000000001), 1.084202172e-19f);
-  EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), 0.9999999404f);
-  EXPECT_EQ(ToFloat(0x8000000000000000), -5.421010862e-20f);
-  EXPECT_EQ(ToFloat(0x8000000000000001), -1.084202172e-19f);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
-}
-
-TEST(GenerateRealTest, U64ToFloat_Signed_Zero_Test) {
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GenerateSignedTag, true>(a);
-  };
-  EXPECT_EQ(ToFloat(0x0000000000000000), 0);
-  EXPECT_EQ(ToFloat(0x0000000000000001), 1.084202172e-19f);
-  EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), 0.9999999404f);
-  EXPECT_EQ(ToFloat(0x8000000000000000), 0);
-  EXPECT_EQ(ToFloat(0x8000000000000001), -1.084202172e-19f);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
-}
-
-TEST(GenerateRealTest, U64ToFloat_Signed_Bias_Test) {
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GenerateSignedTag, true>(a, 1);
-  };
-  EXPECT_EQ(ToFloat(0x0000000000000000), 0);
-  EXPECT_EQ(ToFloat(0x0000000000000001), 2 * 1.084202172e-19f);
-  EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), 2 * 0.9999999404f);
-  EXPECT_EQ(ToFloat(0x8000000000000000), 0);
-  EXPECT_EQ(ToFloat(0x8000000000000001), 2 * -1.084202172e-19f);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 2 * -0.9999999404f);
-}
-
-TEST(GenerateRealTest, U64ToFloatTest) {
-  auto ToFloat = [](uint64_t a) -> float {
-    return GenerateRealFromBits<float, GeneratePositiveTag, true>(a);
-  };
-
-  EXPECT_EQ(ToFloat(0x0000000000000000), 0.0f);
-
-  EXPECT_EQ(ToFloat(0x8000000000000000), 0.5f);
-  EXPECT_EQ(ToFloat(0x8000000000000001), 0.5f);
-  EXPECT_EQ(ToFloat(0x800000FFFFFFFFFF), 0.5f);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 0.9999999404f);
-
-  EXPECT_GT(ToFloat(0x0000000000000001), 0.0f);
-
-  EXPECT_NE(ToFloat(0x7FFFFF0000000000), ToFloat(0x7FFFFEFFFFFFFFFF));
-
-  EXPECT_LT(ToFloat(0xFFFFFFFFFFFFFFFF), 1.0f);
-  int32_t two_to_24 = 1 << 24;
-  EXPECT_EQ(static_cast<int32_t>(ToFloat(0xFFFFFFFFFFFFFFFF) * two_to_24),
-            two_to_24 - 1);
-  EXPECT_NE(static_cast<int32_t>(ToFloat(0xFFFFFFFFFFFFFFFF) * two_to_24 * 2),
-            two_to_24 * 2 - 1);
-  EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), ToFloat(0xFFFFFF0000000000));
-  EXPECT_NE(ToFloat(0xFFFFFFFFFFFFFFFF), ToFloat(0xFFFFFEFFFFFFFFFF));
-  EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), ToFloat(0x7FFFFF8000000000));
-  EXPECT_NE(ToFloat(0x7FFFFFFFFFFFFFFF), ToFloat(0x7FFFFF7FFFFFFFFF));
-  EXPECT_EQ(ToFloat(0x3FFFFFFFFFFFFFFF), ToFloat(0x3FFFFFC000000000));
-  EXPECT_NE(ToFloat(0x3FFFFFFFFFFFFFFF), ToFloat(0x3FFFFFBFFFFFFFFF));
-
-  // For values where every bit counts, the values scale as multiples of the
-  // input.
-  for (int i = 0; i < 100; ++i) {
-    EXPECT_EQ(i * ToFloat(0x0000000000000001), ToFloat(i));
-  }
-
-  // For each i: value generated from (1 << i).
-  float exp_values[64];
-  exp_values[63] = 0.5f;
-  for (int i = 62; i >= 0; --i) exp_values[i] = 0.5f * exp_values[i + 1];
-  constexpr uint64_t one = 1;
-  for (int i = 0; i < 64; ++i) {
-    EXPECT_EQ(ToFloat(one << i), exp_values[i]);
-    for (int j = 1; j < FLT_MANT_DIG && i - j >= 0; ++j) {
-      EXPECT_NE(exp_values[i] + exp_values[i - j], exp_values[i]);
-      EXPECT_EQ(ToFloat((one << i) + (one << (i - j))),
-                exp_values[i] + exp_values[i - j]);
-    }
-    for (int j = FLT_MANT_DIG; i - j >= 0; ++j) {
-      EXPECT_EQ(exp_values[i] + exp_values[i - j], exp_values[i]);
-      EXPECT_EQ(ToFloat((one << i) + (one << (i - j))), exp_values[i]);
-    }
-  }
-}
-
-TEST(GenerateRealTest, U64ToDouble_Positive_NoZero_Test) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GeneratePositiveTag, false>(a);
-  };
-
-  EXPECT_EQ(ToDouble(0x0000000000000000), 2.710505431213761085e-20);
-  EXPECT_EQ(ToDouble(0x0000000000000001), 5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x0000000000000002), 1.084202172485504434e-19);
-  EXPECT_EQ(ToDouble(0x8000000000000000), 0.5);
-  EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), 0.999999999999999888978);
-}
-
-TEST(GenerateRealTest, U64ToDouble_Positive_Zero_Test) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GeneratePositiveTag, true>(a);
-  };
-
-  EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
-  EXPECT_EQ(ToDouble(0x0000000000000001), 5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x8000000000000000), 0.5);
-  EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), 0.999999999999999888978);
-}
-
-TEST(GenerateRealTest, U64ToDouble_Negative_NoZero_Test) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GenerateNegativeTag, false>(a);
-  };
-
-  EXPECT_EQ(ToDouble(0x0000000000000000), -2.710505431213761085e-20);
-  EXPECT_EQ(ToDouble(0x0000000000000001), -5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x0000000000000002), -1.084202172485504434e-19);
-  EXPECT_EQ(ToDouble(0x8000000000000000), -0.5);
-  EXPECT_EQ(ToDouble(0x8000000000000001), -0.5);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
-}
-
-TEST(GenerateRealTest, U64ToDouble_Negative_Zero_Test) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GenerateNegativeTag, true>(a);
-  };
-
-  EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
-  EXPECT_EQ(ToDouble(0x0000000000000001), -5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x0000000000000002), -1.084202172485504434e-19);
-  EXPECT_EQ(ToDouble(0x8000000000000000), -0.5);
-  EXPECT_EQ(ToDouble(0x8000000000000001), -0.5);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
-}
-
-TEST(GenerateRealTest, U64ToDouble_Signed_NoZero_Test) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GenerateSignedTag, false>(a);
-  };
-
-  EXPECT_EQ(ToDouble(0x0000000000000000), 5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19);
-  EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), 0.999999999999999888978);
-  EXPECT_EQ(ToDouble(0x8000000000000000), -5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
-}
-
-TEST(GenerateRealTest, U64ToDouble_Signed_Zero_Test) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GenerateSignedTag, true>(a);
-  };
-  EXPECT_EQ(ToDouble(0x0000000000000000), 0);
-  EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19);
-  EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), 0.999999999999999888978);
-  EXPECT_EQ(ToDouble(0x8000000000000000), 0);
-  EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
-}
-
-TEST(GenerateRealTest, U64ToDouble_GenerateSignedTag_Bias_Test) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GenerateSignedTag, true>(a, -1);
-  };
-  EXPECT_EQ(ToDouble(0x0000000000000000), 0);
-  EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19 / 2);
-  EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), 0.999999999999999888978 / 2);
-  EXPECT_EQ(ToDouble(0x8000000000000000), 0);
-  EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19 / 2);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978 / 2);
-}
-
-TEST(GenerateRealTest, U64ToDoubleTest) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GeneratePositiveTag, true>(a);
-  };
-
-  EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
-  EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
-
-  EXPECT_EQ(ToDouble(0x0000000000000001), 5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x7fffffffffffffef), 0.499999999999999944489);
-  EXPECT_EQ(ToDouble(0x8000000000000000), 0.5);
-
-  // For values > 0.5, RandU64ToDouble discards up to 11 bits. (64-53).
-  EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
-  EXPECT_EQ(ToDouble(0x80000000000007FF), 0.5);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), 0.999999999999999888978);
-  EXPECT_NE(ToDouble(0x7FFFFFFFFFFFF800), ToDouble(0x7FFFFFFFFFFFF7FF));
-
-  EXPECT_LT(ToDouble(0xFFFFFFFFFFFFFFFF), 1.0);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), ToDouble(0xFFFFFFFFFFFFF800));
-  EXPECT_NE(ToDouble(0xFFFFFFFFFFFFFFFF), ToDouble(0xFFFFFFFFFFFFF7FF));
-  EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFFC00));
-  EXPECT_NE(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFFBFF));
-  EXPECT_EQ(ToDouble(0x3FFFFFFFFFFFFFFF), ToDouble(0x3FFFFFFFFFFFFE00));
-  EXPECT_NE(ToDouble(0x3FFFFFFFFFFFFFFF), ToDouble(0x3FFFFFFFFFFFFDFF));
-
-  EXPECT_EQ(ToDouble(0x1000000000000001), 0.0625);
-  EXPECT_EQ(ToDouble(0x2000000000000001), 0.125);
-  EXPECT_EQ(ToDouble(0x3000000000000001), 0.1875);
-  EXPECT_EQ(ToDouble(0x4000000000000001), 0.25);
-  EXPECT_EQ(ToDouble(0x5000000000000001), 0.3125);
-  EXPECT_EQ(ToDouble(0x6000000000000001), 0.375);
-  EXPECT_EQ(ToDouble(0x7000000000000001), 0.4375);
-  EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
-  EXPECT_EQ(ToDouble(0x9000000000000001), 0.5625);
-  EXPECT_EQ(ToDouble(0xa000000000000001), 0.625);
-  EXPECT_EQ(ToDouble(0xb000000000000001), 0.6875);
-  EXPECT_EQ(ToDouble(0xc000000000000001), 0.75);
-  EXPECT_EQ(ToDouble(0xd000000000000001), 0.8125);
-  EXPECT_EQ(ToDouble(0xe000000000000001), 0.875);
-  EXPECT_EQ(ToDouble(0xf000000000000001), 0.9375);
-
-  // Large powers of 2.
-  int64_t two_to_53 = int64_t{1} << 53;
-  EXPECT_EQ(static_cast<int64_t>(ToDouble(0xFFFFFFFFFFFFFFFF) * two_to_53),
-            two_to_53 - 1);
-  EXPECT_NE(static_cast<int64_t>(ToDouble(0xFFFFFFFFFFFFFFFF) * two_to_53 * 2),
-            two_to_53 * 2 - 1);
-
-  // For values where every bit counts, the values scale as multiples of the
-  // input.
-  for (int i = 0; i < 100; ++i) {
-    EXPECT_EQ(i * ToDouble(0x0000000000000001), ToDouble(i));
-  }
-
-  // For each i: value generated from (1 << i).
-  double exp_values[64];
-  exp_values[63] = 0.5;
-  for (int i = 62; i >= 0; --i) exp_values[i] = 0.5 * exp_values[i + 1];
-  constexpr uint64_t one = 1;
-  for (int i = 0; i < 64; ++i) {
-    EXPECT_EQ(ToDouble(one << i), exp_values[i]);
-    for (int j = 1; j < DBL_MANT_DIG && i - j >= 0; ++j) {
-      EXPECT_NE(exp_values[i] + exp_values[i - j], exp_values[i]);
-      EXPECT_EQ(ToDouble((one << i) + (one << (i - j))),
-                exp_values[i] + exp_values[i - j]);
-    }
-    for (int j = DBL_MANT_DIG; i - j >= 0; ++j) {
-      EXPECT_EQ(exp_values[i] + exp_values[i - j], exp_values[i]);
-      EXPECT_EQ(ToDouble((one << i) + (one << (i - j))), exp_values[i]);
-    }
-  }
-}
-
-TEST(GenerateRealTest, U64ToDoubleSignedTest) {
-  auto ToDouble = [](uint64_t a) {
-    return GenerateRealFromBits<double, GenerateSignedTag, false>(a);
-  };
-
-  EXPECT_EQ(ToDouble(0x0000000000000000), 5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19);
-
-  EXPECT_EQ(ToDouble(0x8000000000000000), -5.42101086242752217004e-20);
-  EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19);
-
-  const double e_plus = ToDouble(0x0000000000000001);
-  const double e_minus = ToDouble(0x8000000000000001);
-  EXPECT_EQ(e_plus, 1.084202172485504434e-19);
-  EXPECT_EQ(e_minus, -1.084202172485504434e-19);
-
-  EXPECT_EQ(ToDouble(0x3fffffffffffffef), 0.499999999999999944489);
-  EXPECT_EQ(ToDouble(0xbfffffffffffffef), -0.499999999999999944489);
-
-  // For values > 0.5, RandU64ToDouble discards up to 10 bits. (63-53).
-  EXPECT_EQ(ToDouble(0x4000000000000000), 0.5);
-  EXPECT_EQ(ToDouble(0x4000000000000001), 0.5);
-  EXPECT_EQ(ToDouble(0x40000000000003FF), 0.5);
-
-  EXPECT_EQ(ToDouble(0xC000000000000000), -0.5);
-  EXPECT_EQ(ToDouble(0xC000000000000001), -0.5);
-  EXPECT_EQ(ToDouble(0xC0000000000003FF), -0.5);
-
-  EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFe), 0.999999999999999888978);
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFe), -0.999999999999999888978);
-
-  EXPECT_NE(ToDouble(0x7FFFFFFFFFFFF800), ToDouble(0x7FFFFFFFFFFFF7FF));
-
-  EXPECT_LT(ToDouble(0x7FFFFFFFFFFFFFFF), 1.0);
-  EXPECT_GT(ToDouble(0x7FFFFFFFFFFFFFFF), 0.9999999999);
-
-  EXPECT_GT(ToDouble(0xFFFFFFFFFFFFFFFe), -1.0);
-  EXPECT_LT(ToDouble(0xFFFFFFFFFFFFFFFe), -0.999999999);
-
-  EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFe), ToDouble(0xFFFFFFFFFFFFFC00));
-  EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFFC00));
-  EXPECT_NE(ToDouble(0xFFFFFFFFFFFFFFFe), ToDouble(0xFFFFFFFFFFFFF3FF));
-  EXPECT_NE(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFF3FF));
-
-  EXPECT_EQ(ToDouble(0x1000000000000001), 0.125);
-  EXPECT_EQ(ToDouble(0x2000000000000001), 0.25);
-  EXPECT_EQ(ToDouble(0x3000000000000001), 0.375);
-  EXPECT_EQ(ToDouble(0x4000000000000001), 0.5);
-  EXPECT_EQ(ToDouble(0x5000000000000001), 0.625);
-  EXPECT_EQ(ToDouble(0x6000000000000001), 0.75);
-  EXPECT_EQ(ToDouble(0x7000000000000001), 0.875);
-  EXPECT_EQ(ToDouble(0x7800000000000001), 0.9375);
-  EXPECT_EQ(ToDouble(0x7c00000000000001), 0.96875);
-  EXPECT_EQ(ToDouble(0x7e00000000000001), 0.984375);
-  EXPECT_EQ(ToDouble(0x7f00000000000001), 0.9921875);
-
-  // 0x8000000000000000 ~= 0
-  EXPECT_EQ(ToDouble(0x9000000000000001), -0.125);
-  EXPECT_EQ(ToDouble(0xa000000000000001), -0.25);
-  EXPECT_EQ(ToDouble(0xb000000000000001), -0.375);
-  EXPECT_EQ(ToDouble(0xc000000000000001), -0.5);
-  EXPECT_EQ(ToDouble(0xd000000000000001), -0.625);
-  EXPECT_EQ(ToDouble(0xe000000000000001), -0.75);
-  EXPECT_EQ(ToDouble(0xf000000000000001), -0.875);
-
-  // Large powers of 2.
-  int64_t two_to_53 = int64_t{1} << 53;
-  EXPECT_EQ(static_cast<int64_t>(ToDouble(0x7FFFFFFFFFFFFFFF) * two_to_53),
-            two_to_53 - 1);
-  EXPECT_EQ(static_cast<int64_t>(ToDouble(0xFFFFFFFFFFFFFFFF) * two_to_53),
-            -(two_to_53 - 1));
-
-  EXPECT_NE(static_cast<int64_t>(ToDouble(0x7FFFFFFFFFFFFFFF) * two_to_53 * 2),
-            two_to_53 * 2 - 1);
-
-  // For values where every bit counts, the values scale as multiples of the
-  // input.
-  for (int i = 1; i < 100; ++i) {
-    EXPECT_EQ(i * e_plus, ToDouble(i)) << i;
-    EXPECT_EQ(i * e_minus, ToDouble(0x8000000000000000 | i)) << i;
-  }
-}
-
-TEST(GenerateRealTest, ExhaustiveFloat) {
-  using absl::base_internal::CountLeadingZeros64;
-  auto ToFloat = [](uint64_t a) {
-    return GenerateRealFromBits<float, GeneratePositiveTag, true>(a);
-  };
-
-  // Rely on RandU64ToFloat generating values from greatest to least when
-  // supplied with uint64_t values from greatest (0xfff...) to least (0x0).
-  // Thus, this algorithm stores the previous value, and if the new value is at
-  // greater than or equal to the previous value, then there is a collision in
-  // the generation algorithm.
-  //
-  // Use the computation below to convert the random value into a result:
-  //   double res = a() * (1.0f - sample) + b() * sample;
-  float last_f = 1.0, last_g = 2.0;
-  uint64_t f_collisions = 0, g_collisions = 0;
-  uint64_t f_unique = 0, g_unique = 0;
-  uint64_t total = 0;
-  auto count = [&](const float r) {
-    total++;
-    // `f` is mapped to the range [0, 1) (default)
-    const float f = 0.0f * (1.0f - r) + 1.0f * r;
-    if (f >= last_f) {
-      f_collisions++;
-    } else {
-      f_unique++;
-      last_f = f;
-    }
-    // `g` is mapped to the range [1, 2)
-    const float g = 1.0f * (1.0f - r) + 2.0f * r;
-    if (g >= last_g) {
-      g_collisions++;
-    } else {
-      g_unique++;
-      last_g = g;
-    }
-  };
-
-  size_t limit = absl::GetFlag(FLAGS_absl_random_test_trials);
-
-  // Generate all uint64_t which have unique floating point values.
-  // Counting down from 0xFFFFFFFFFFFFFFFFu ... 0x0u
-  uint64_t x = ~uint64_t(0);
-  for (; x != 0 && limit > 0;) {
-    constexpr int kDig = (64 - FLT_MANT_DIG);
-    // Set a decrement value & the next point at which to change
-    // the decrement value. By default these are 1, 0.
-    uint64_t dec = 1;
-    uint64_t chk = 0;
-
-    // Adjust decrement and check value based on how many leading 0
-    // bits are set in the current value.
-    const int clz = CountLeadingZeros64(x);
-    if (clz < kDig) {
-      dec <<= (kDig - clz);
-      chk = (~uint64_t(0)) >> (clz + 1);
-    }
-    for (; x > chk && limit > 0; x -= dec) {
-      count(ToFloat(x));
-      --limit;
-    }
-  }
-
-  static_assert(FLT_MANT_DIG == 24,
-                "The float type is expected to have a 24 bit mantissa.");
-
-  if (limit != 0) {
-    // There are between 2^28 and 2^29 unique values in the range [0, 1).  For
-    // the low values of x, there are 2^24 -1 unique values.  Once x > 2^24,
-    // there are 40 * 2^24 unique values. Thus:
-    // (2 + 4 + 8 ... + 2^23) + 40 * 2^23
-    EXPECT_LT(1 << 28, f_unique);
-    EXPECT_EQ((1 << 24) + 40 * (1 << 23) - 1, f_unique);
-    EXPECT_EQ(total, f_unique);
-    EXPECT_EQ(0, f_collisions);
-
-    // Expect at least 2^23 unique values for the range [1, 2)
-    EXPECT_LE(1 << 23, g_unique);
-    EXPECT_EQ(total - g_unique, g_collisions);
-  }
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/iostream_state_saver.h b/third_party/abseil_cpp/absl/random/internal/iostream_state_saver.h
deleted file mode 100644
index e6e242ee1e66..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/iostream_state_saver.h
+++ /dev/null
@@ -1,245 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_IOSTREAM_STATE_SAVER_H_
-#define ABSL_RANDOM_INTERNAL_IOSTREAM_STATE_SAVER_H_
-
-#include <cmath>
-#include <iostream>
-#include <limits>
-#include <type_traits>
-
-#include "absl/meta/type_traits.h"
-#include "absl/numeric/int128.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// The null_state_saver does nothing.
-template <typename T>
-class null_state_saver {
- public:
-  using stream_type = T;
-  using flags_type = std::ios_base::fmtflags;
-
-  null_state_saver(T&, flags_type) {}
-  ~null_state_saver() {}
-};
-
-// ostream_state_saver is a RAII object to save and restore the common
-// basic_ostream flags used when implementing `operator <<()` on any of
-// the absl random distributions.
-template <typename OStream>
-class ostream_state_saver {
- public:
-  using ostream_type = OStream;
-  using flags_type = std::ios_base::fmtflags;
-  using fill_type = typename ostream_type::char_type;
-  using precision_type = std::streamsize;
-
-  ostream_state_saver(ostream_type& os,  // NOLINT(runtime/references)
-                      flags_type flags, fill_type fill)
-      : os_(os),
-        flags_(os.flags(flags)),
-        fill_(os.fill(fill)),
-        precision_(os.precision()) {
-    // Save state in initialized variables.
-  }
-
-  ~ostream_state_saver() {
-    // Restore saved state.
-    os_.precision(precision_);
-    os_.fill(fill_);
-    os_.flags(flags_);
-  }
-
- private:
-  ostream_type& os_;
-  const flags_type flags_;
-  const fill_type fill_;
-  const precision_type precision_;
-};
-
-#if defined(__NDK_MAJOR__) && __NDK_MAJOR__ < 16
-#define ABSL_RANDOM_INTERNAL_IOSTREAM_HEXFLOAT 1
-#else
-#define ABSL_RANDOM_INTERNAL_IOSTREAM_HEXFLOAT 0
-#endif
-
-template <typename CharT, typename Traits>
-ostream_state_saver<std::basic_ostream<CharT, Traits>> make_ostream_state_saver(
-    std::basic_ostream<CharT, Traits>& os,  // NOLINT(runtime/references)
-    std::ios_base::fmtflags flags = std::ios_base::dec | std::ios_base::left |
-#if ABSL_RANDOM_INTERNAL_IOSTREAM_HEXFLOAT
-                                    std::ios_base::fixed |
-#endif
-                                    std::ios_base::scientific) {
-  using result_type = ostream_state_saver<std::basic_ostream<CharT, Traits>>;
-  return result_type(os, flags, os.widen(' '));
-}
-
-template <typename T>
-typename absl::enable_if_t<!std::is_base_of<std::ios_base, T>::value,
-                           null_state_saver<T>>
-make_ostream_state_saver(T& is,  // NOLINT(runtime/references)
-                         std::ios_base::fmtflags flags = std::ios_base::dec) {
-  std::cerr << "null_state_saver";
-  using result_type = null_state_saver<T>;
-  return result_type(is, flags);
-}
-
-// stream_precision_helper<type>::kPrecision returns the base 10 precision
-// required to stream and reconstruct a real type exact binary value through
-// a binary->decimal->binary transition.
-template <typename T>
-struct stream_precision_helper {
-  // max_digits10 may be 0 on MSVC; if so, use digits10 + 3.
-  static constexpr int kPrecision =
-      (std::numeric_limits<T>::max_digits10 > std::numeric_limits<T>::digits10)
-          ? std::numeric_limits<T>::max_digits10
-          : (std::numeric_limits<T>::digits10 + 3);
-};
-
-template <>
-struct stream_precision_helper<float> {
-  static constexpr int kPrecision = 9;
-};
-template <>
-struct stream_precision_helper<double> {
-  static constexpr int kPrecision = 17;
-};
-template <>
-struct stream_precision_helper<long double> {
-  static constexpr int kPrecision = 36;  // assuming fp128
-};
-
-// istream_state_saver is a RAII object to save and restore the common
-// std::basic_istream<> flags used when implementing `operator >>()` on any of
-// the absl random distributions.
-template <typename IStream>
-class istream_state_saver {
- public:
-  using istream_type = IStream;
-  using flags_type = std::ios_base::fmtflags;
-
-  istream_state_saver(istream_type& is,  // NOLINT(runtime/references)
-                      flags_type flags)
-      : is_(is), flags_(is.flags(flags)) {}
-
-  ~istream_state_saver() { is_.flags(flags_); }
-
- private:
-  istream_type& is_;
-  flags_type flags_;
-};
-
-template <typename CharT, typename Traits>
-istream_state_saver<std::basic_istream<CharT, Traits>> make_istream_state_saver(
-    std::basic_istream<CharT, Traits>& is,  // NOLINT(runtime/references)
-    std::ios_base::fmtflags flags = std::ios_base::dec |
-                                    std::ios_base::scientific |
-                                    std::ios_base::skipws) {
-  using result_type = istream_state_saver<std::basic_istream<CharT, Traits>>;
-  return result_type(is, flags);
-}
-
-template <typename T>
-typename absl::enable_if_t<!std::is_base_of<std::ios_base, T>::value,
-                           null_state_saver<T>>
-make_istream_state_saver(T& is,  // NOLINT(runtime/references)
-                         std::ios_base::fmtflags flags = std::ios_base::dec) {
-  using result_type = null_state_saver<T>;
-  return result_type(is, flags);
-}
-
-// stream_format_type<T> is a helper struct to convert types which
-// basic_iostream cannot output as decimal numbers into types which
-// basic_iostream can output as decimal numbers. Specifically:
-// * signed/unsigned char-width types are converted to int.
-// * TODO(lar): __int128 => uint128, except there is no operator << yet.
-//
-template <typename T>
-struct stream_format_type
-    : public std::conditional<(sizeof(T) == sizeof(char)), int, T> {};
-
-// stream_u128_helper allows us to write out either absl::uint128 or
-// __uint128_t types in the same way, which enables their use as internal
-// state of PRNG engines.
-template <typename T>
-struct stream_u128_helper;
-
-template <>
-struct stream_u128_helper<absl::uint128> {
-  template <typename IStream>
-  inline absl::uint128 read(IStream& in) {
-    uint64_t h = 0;
-    uint64_t l = 0;
-    in >> h >> l;
-    return absl::MakeUint128(h, l);
-  }
-
-  template <typename OStream>
-  inline void write(absl::uint128 val, OStream& out) {
-    uint64_t h = absl::Uint128High64(val);
-    uint64_t l = absl::Uint128Low64(val);
-    out << h << out.fill() << l;
-  }
-};
-
-#ifdef ABSL_HAVE_INTRINSIC_INT128
-template <>
-struct stream_u128_helper<__uint128_t> {
-  template <typename IStream>
-  inline __uint128_t read(IStream& in) {
-    uint64_t h = 0;
-    uint64_t l = 0;
-    in >> h >> l;
-    return (static_cast<__uint128_t>(h) << 64) | l;
-  }
-
-  template <typename OStream>
-  inline void write(__uint128_t val, OStream& out) {
-    uint64_t h = static_cast<uint64_t>(val >> 64u);
-    uint64_t l = static_cast<uint64_t>(val);
-    out << h << out.fill() << l;
-  }
-};
-#endif
-
-template <typename FloatType, typename IStream>
-inline FloatType read_floating_point(IStream& is) {
-  static_assert(std::is_floating_point<FloatType>::value, "");
-  FloatType dest;
-  is >> dest;
-  // Parsing a double value may report a subnormal value as an error
-  // despite being able to represent it.
-  // See https://stackoverflow.com/q/52410931/3286653
-  // It may also report an underflow when parsing DOUBLE_MIN as an
-  // ERANGE error, as the parsed value may be smaller than DOUBLE_MIN
-  // and rounded up.
-  // See: https://stackoverflow.com/q/42005462
-  if (is.fail() &&
-      (std::fabs(dest) == (std::numeric_limits<FloatType>::min)() ||
-       std::fpclassify(dest) == FP_SUBNORMAL)) {
-    is.clear(is.rdstate() & (~std::ios_base::failbit));
-  }
-  return dest;
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_IOSTREAM_STATE_SAVER_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/iostream_state_saver_test.cc b/third_party/abseil_cpp/absl/random/internal/iostream_state_saver_test.cc
deleted file mode 100644
index 7bb8ad959cf6..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/iostream_state_saver_test.cc
+++ /dev/null
@@ -1,371 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/iostream_state_saver.h"
-
-#include <sstream>
-#include <string>
-
-#include "gtest/gtest.h"
-
-namespace {
-
-using absl::random_internal::make_istream_state_saver;
-using absl::random_internal::make_ostream_state_saver;
-using absl::random_internal::stream_precision_helper;
-
-template <typename T>
-typename absl::enable_if_t<std::is_integral<T>::value, T>  //
-StreamRoundTrip(T t) {
-  std::stringstream ss;
-  {
-    auto saver = make_ostream_state_saver(ss);
-    ss.precision(stream_precision_helper<T>::kPrecision);
-    ss << t;
-  }
-  T result = 0;
-  {
-    auto saver = make_istream_state_saver(ss);
-    ss >> result;
-  }
-  EXPECT_FALSE(ss.fail())            //
-      << ss.str() << " "             //
-      << (ss.good() ? "good " : "")  //
-      << (ss.bad() ? "bad " : "")    //
-      << (ss.eof() ? "eof " : "")    //
-      << (ss.fail() ? "fail " : "");
-
-  return result;
-}
-
-template <typename T>
-typename absl::enable_if_t<std::is_floating_point<T>::value, T>  //
-StreamRoundTrip(T t) {
-  std::stringstream ss;
-  {
-    auto saver = make_ostream_state_saver(ss);
-    ss.precision(stream_precision_helper<T>::kPrecision);
-    ss << t;
-  }
-  T result = 0;
-  {
-    auto saver = make_istream_state_saver(ss);
-    result = absl::random_internal::read_floating_point<T>(ss);
-  }
-  EXPECT_FALSE(ss.fail())            //
-      << ss.str() << " "             //
-      << (ss.good() ? "good " : "")  //
-      << (ss.bad() ? "bad " : "")    //
-      << (ss.eof() ? "eof " : "")    //
-      << (ss.fail() ? "fail " : "");
-
-  return result;
-}
-
-TEST(IOStreamStateSaver, BasicSaverState) {
-  std::stringstream ss;
-  ss.precision(2);
-  ss.fill('x');
-  ss.flags(std::ios_base::dec | std::ios_base::right);
-
-  {
-    auto saver = make_ostream_state_saver(ss);
-    ss.precision(10);
-    EXPECT_NE('x', ss.fill());
-    EXPECT_EQ(10, ss.precision());
-    EXPECT_NE(std::ios_base::dec | std::ios_base::right, ss.flags());
-
-    ss << 1.23;
-  }
-
-  EXPECT_EQ('x', ss.fill());
-  EXPECT_EQ(2, ss.precision());
-  EXPECT_EQ(std::ios_base::dec | std::ios_base::right, ss.flags());
-}
-
-TEST(IOStreamStateSaver, RoundTripInts) {
-  const uint64_t kUintValues[] = {
-      0,
-      1,
-      static_cast<uint64_t>(-1),
-      2,
-      static_cast<uint64_t>(-2),
-
-      1 << 7,
-      1 << 8,
-      1 << 16,
-      1ull << 32,
-      1ull << 50,
-      1ull << 62,
-      1ull << 63,
-
-      (1 << 7) - 1,
-      (1 << 8) - 1,
-      (1 << 16) - 1,
-      (1ull << 32) - 1,
-      (1ull << 50) - 1,
-      (1ull << 62) - 1,
-      (1ull << 63) - 1,
-
-      static_cast<uint64_t>(-(1 << 8)),
-      static_cast<uint64_t>(-(1 << 16)),
-      static_cast<uint64_t>(-(1ll << 32)),
-      static_cast<uint64_t>(-(1ll << 50)),
-      static_cast<uint64_t>(-(1ll << 62)),
-
-      static_cast<uint64_t>(-(1 << 8) - 1),
-      static_cast<uint64_t>(-(1 << 16) - 1),
-      static_cast<uint64_t>(-(1ll << 32) - 1),
-      static_cast<uint64_t>(-(1ll << 50) - 1),
-      static_cast<uint64_t>(-(1ll << 62) - 1),
-  };
-
-  for (const uint64_t u : kUintValues) {
-    EXPECT_EQ(u, StreamRoundTrip<uint64_t>(u));
-
-    int64_t x = static_cast<int64_t>(u);
-    EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
-
-    double d = static_cast<double>(x);
-    EXPECT_EQ(d, StreamRoundTrip<double>(d));
-
-    float f = d;
-    EXPECT_EQ(f, StreamRoundTrip<float>(f));
-  }
-}
-
-TEST(IOStreamStateSaver, RoundTripFloats) {
-  static_assert(
-      stream_precision_helper<float>::kPrecision >= 9,
-      "stream_precision_helper<float>::kPrecision should be at least 9");
-
-  const float kValues[] = {
-      1,
-      std::nextafter(1.0f, 0.0f),  // 1 - epsilon
-      std::nextafter(1.0f, 2.0f),  // 1 + epsilon
-
-      1.0e+1f,
-      1.0e-1f,
-      1.0e+2f,
-      1.0e-2f,
-      1.0e+10f,
-      1.0e-10f,
-
-      0.00000051110000111311111111f,
-      -0.00000051110000111211111111f,
-
-      1.234678912345678912345e+6f,
-      1.234678912345678912345e-6f,
-      1.234678912345678912345e+30f,
-      1.234678912345678912345e-30f,
-      1.234678912345678912345e+38f,
-      1.0234678912345678912345e-38f,
-
-      // Boundary cases.
-      std::numeric_limits<float>::max(),
-      std::numeric_limits<float>::lowest(),
-      std::numeric_limits<float>::epsilon(),
-      std::nextafter(std::numeric_limits<float>::min(),
-                     1.0f),               // min + epsilon
-      std::numeric_limits<float>::min(),  // smallest normal
-      // There are some errors dealing with denorms on apple platforms.
-      std::numeric_limits<float>::denorm_min(),  // smallest denorm
-      std::numeric_limits<float>::min() / 2,
-      std::nextafter(std::numeric_limits<float>::min(),
-                     0.0f),  // denorm_max
-      std::nextafter(std::numeric_limits<float>::denorm_min(), 1.0f),
-  };
-
-  for (const float f : kValues) {
-    EXPECT_EQ(f, StreamRoundTrip<float>(f));
-    EXPECT_EQ(-f, StreamRoundTrip<float>(-f));
-
-    double d = f;
-    EXPECT_EQ(d, StreamRoundTrip<double>(d));
-    EXPECT_EQ(-d, StreamRoundTrip<double>(-d));
-
-    // Avoid undefined behavior (overflow/underflow).
-    if (f <= static_cast<float>(std::numeric_limits<int64_t>::max()) &&
-        f >= static_cast<float>(std::numeric_limits<int64_t>::lowest())) {
-      int64_t x = static_cast<int64_t>(f);
-      EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
-    }
-  }
-}
-
-TEST(IOStreamStateSaver, RoundTripDoubles) {
-  static_assert(
-      stream_precision_helper<double>::kPrecision >= 17,
-      "stream_precision_helper<double>::kPrecision should be at least 17");
-
-  const double kValues[] = {
-      1,
-      std::nextafter(1.0, 0.0),  // 1 - epsilon
-      std::nextafter(1.0, 2.0),  // 1 + epsilon
-
-      1.0e+1,
-      1.0e-1,
-      1.0e+2,
-      1.0e-2,
-      1.0e+10,
-      1.0e-10,
-
-      0.00000051110000111311111111,
-      -0.00000051110000111211111111,
-
-      1.234678912345678912345e+6,
-      1.234678912345678912345e-6,
-      1.234678912345678912345e+30,
-      1.234678912345678912345e-30,
-      1.234678912345678912345e+38,
-      1.0234678912345678912345e-38,
-
-      1.0e+100,
-      1.0e-100,
-      1.234678912345678912345e+308,
-      1.0234678912345678912345e-308,
-      2.22507385850720138e-308,
-
-      // Boundary cases.
-      std::numeric_limits<double>::max(),
-      std::numeric_limits<double>::lowest(),
-      std::numeric_limits<double>::epsilon(),
-      std::nextafter(std::numeric_limits<double>::min(),
-                     1.0),                 // min + epsilon
-      std::numeric_limits<double>::min(),  // smallest normal
-      // There are some errors dealing with denorms on apple platforms.
-      std::numeric_limits<double>::denorm_min(),  // smallest denorm
-      std::numeric_limits<double>::min() / 2,
-      std::nextafter(std::numeric_limits<double>::min(),
-                     0.0),  // denorm_max
-      std::nextafter(std::numeric_limits<double>::denorm_min(), 1.0f),
-  };
-
-  for (const double d : kValues) {
-    EXPECT_EQ(d, StreamRoundTrip<double>(d));
-    EXPECT_EQ(-d, StreamRoundTrip<double>(-d));
-
-    // Avoid undefined behavior (overflow/underflow).
-    if (d <= std::numeric_limits<float>::max() &&
-        d >= std::numeric_limits<float>::lowest()) {
-      float f = static_cast<float>(d);
-      EXPECT_EQ(f, StreamRoundTrip<float>(f));
-    }
-
-    // Avoid undefined behavior (overflow/underflow).
-    if (d <= static_cast<double>(std::numeric_limits<int64_t>::max()) &&
-        d >= static_cast<double>(std::numeric_limits<int64_t>::lowest())) {
-      int64_t x = static_cast<int64_t>(d);
-      EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
-    }
-  }
-}
-
-#if !defined(__EMSCRIPTEN__)
-TEST(IOStreamStateSaver, RoundTripLongDoubles) {
-  // Technically, C++ only guarantees that long double is at least as large as a
-  // double.  Practically it varies from 64-bits to 128-bits.
-  //
-  // So it is best to consider long double a best-effort extended precision
-  // type.
-
-  static_assert(
-      stream_precision_helper<long double>::kPrecision >= 36,
-      "stream_precision_helper<long double>::kPrecision should be at least 36");
-
-  using real_type = long double;
-  const real_type kValues[] = {
-      1,
-      std::nextafter(1.0, 0.0),  // 1 - epsilon
-      std::nextafter(1.0, 2.0),  // 1 + epsilon
-
-      1.0e+1,
-      1.0e-1,
-      1.0e+2,
-      1.0e-2,
-      1.0e+10,
-      1.0e-10,
-
-      0.00000051110000111311111111,
-      -0.00000051110000111211111111,
-
-      1.2346789123456789123456789123456789e+6,
-      1.2346789123456789123456789123456789e-6,
-      1.2346789123456789123456789123456789e+30,
-      1.2346789123456789123456789123456789e-30,
-      1.2346789123456789123456789123456789e+38,
-      1.2346789123456789123456789123456789e-38,
-      1.2346789123456789123456789123456789e+308,
-      1.2346789123456789123456789123456789e-308,
-
-      1.0e+100,
-      1.0e-100,
-      1.234678912345678912345e+308,
-      1.0234678912345678912345e-308,
-
-      // Boundary cases.
-      std::numeric_limits<real_type>::max(),
-      std::numeric_limits<real_type>::lowest(),
-      std::numeric_limits<real_type>::epsilon(),
-      std::nextafter(std::numeric_limits<real_type>::min(),
-                     real_type(1)),           // min + epsilon
-      std::numeric_limits<real_type>::min(),  // smallest normal
-      // There are some errors dealing with denorms on apple platforms.
-      std::numeric_limits<real_type>::denorm_min(),  // smallest denorm
-      std::numeric_limits<real_type>::min() / 2,
-      std::nextafter(std::numeric_limits<real_type>::min(),
-                     0.0),  // denorm_max
-      std::nextafter(std::numeric_limits<real_type>::denorm_min(), 1.0f),
-  };
-
-  int index = -1;
-  for (const long double dd : kValues) {
-    index++;
-    EXPECT_EQ(dd, StreamRoundTrip<real_type>(dd)) << index;
-    EXPECT_EQ(-dd, StreamRoundTrip<real_type>(-dd)) << index;
-
-    // Avoid undefined behavior (overflow/underflow).
-    if (dd <= std::numeric_limits<double>::max() &&
-        dd >= std::numeric_limits<double>::lowest()) {
-      double d = static_cast<double>(dd);
-      EXPECT_EQ(d, StreamRoundTrip<double>(d));
-    }
-
-    // Avoid undefined behavior (overflow/underflow).
-    if (dd <= std::numeric_limits<int64_t>::max() &&
-        dd >= std::numeric_limits<int64_t>::lowest()) {
-      int64_t x = static_cast<int64_t>(dd);
-      EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
-    }
-  }
-}
-#endif  // !defined(__EMSCRIPTEN__)
-
-TEST(StrToDTest, DoubleMin) {
-  const char kV[] = "2.22507385850720138e-308";
-  char* end;
-  double x = std::strtod(kV, &end);
-  EXPECT_EQ(std::numeric_limits<double>::min(), x);
-  // errno may equal ERANGE.
-}
-
-TEST(StrToDTest, DoubleDenormMin) {
-  const char kV[] = "4.94065645841246544e-324";
-  char* end;
-  double x = std::strtod(kV, &end);
-  EXPECT_EQ(std::numeric_limits<double>::denorm_min(), x);
-  // errno may equal ERANGE.
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/mock_helpers.h b/third_party/abseil_cpp/absl/random/internal/mock_helpers.h
deleted file mode 100644
index 9af27ab3a210..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/mock_helpers.h
+++ /dev/null
@@ -1,127 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_MOCK_HELPERS_H_
-#define ABSL_RANDOM_INTERNAL_MOCK_HELPERS_H_
-
-#include <tuple>
-#include <type_traits>
-
-#include "absl/base/internal/fast_type_id.h"
-#include "absl/types/optional.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// MockHelpers works in conjunction with MockOverloadSet, MockingBitGen, and
-// BitGenRef to enable the mocking capability for absl distribution functions.
-//
-// MockingBitGen registers mocks based on the typeid of a mock signature, KeyT,
-// which is used to generate a unique id.
-//
-// KeyT is a signature of the form:
-//   result_type(discriminator_type, std::tuple<args...>)
-// The mocked function signature will be composed from KeyT as:
-//   result_type(args...)
-//
-class MockHelpers {
-  using IdType = ::absl::base_internal::FastTypeIdType;
-
-  // Given a key signature type used to index the mock, extract the components.
-  // KeyT is expected to have the form:
-  //   result_type(discriminator_type, arg_tuple_type)
-  template <typename KeyT>
-  struct KeySignature;
-
-  template <typename ResultT, typename DiscriminatorT, typename ArgTupleT>
-  struct KeySignature<ResultT(DiscriminatorT, ArgTupleT)> {
-    using result_type = ResultT;
-    using discriminator_type = DiscriminatorT;
-    using arg_tuple_type = ArgTupleT;
-  };
-
-  // Detector for InvokeMock.
-  template <class T>
-  using invoke_mock_t = decltype(std::declval<T*>()->InvokeMock(
-      std::declval<IdType>(), std::declval<void*>(), std::declval<void*>()));
-
-  // Empty implementation of InvokeMock.
-  template <typename KeyT, typename ReturnT, typename ArgTupleT, typename URBG,
-            typename... Args>
-  static absl::optional<ReturnT> InvokeMockImpl(char, URBG*, Args&&...) {
-    return absl::nullopt;
-  }
-
-  // Non-empty implementation of InvokeMock.
-  template <typename KeyT, typename ReturnT, typename ArgTupleT, typename URBG,
-            typename = invoke_mock_t<URBG>, typename... Args>
-  static absl::optional<ReturnT> InvokeMockImpl(int, URBG* urbg,
-                                                Args&&... args) {
-    ArgTupleT arg_tuple(std::forward<Args>(args)...);
-    ReturnT result;
-    if (urbg->InvokeMock(::absl::base_internal::FastTypeId<KeyT>(), &arg_tuple,
-                         &result)) {
-      return result;
-    }
-    return absl::nullopt;
-  }
-
- public:
-  // Invoke a mock for the KeyT (may or may not be a signature).
-  //
-  // KeyT is used to generate a typeid-based lookup key for the mock.
-  // KeyT is a signature of the form:
-  //   result_type(discriminator_type, std::tuple<args...>)
-  // The mocked function signature will be composed from KeyT as:
-  //   result_type(args...)
-  //
-  // An instance of arg_tuple_type must be constructable from Args..., since
-  // the underlying mechanism requires a pointer to an argument tuple.
-  template <typename KeyT, typename URBG, typename... Args>
-  static auto MaybeInvokeMock(URBG* urbg, Args&&... args)
-      -> absl::optional<typename KeySignature<KeyT>::result_type> {
-    // Use function overloading to dispatch to the implemenation since
-    // more modern patterns (e.g. require + constexpr) are not supported in all
-    // compiler configurations.
-    return InvokeMockImpl<KeyT, typename KeySignature<KeyT>::result_type,
-                          typename KeySignature<KeyT>::arg_tuple_type, URBG>(
-        0, urbg, std::forward<Args>(args)...);
-  }
-
-  // Acquire a mock for the KeyT (may or may not be a signature).
-  //
-  // KeyT is used to generate a typeid-based lookup for the mock.
-  // KeyT is a signature of the form:
-  //   result_type(discriminator_type, std::tuple<args...>)
-  // The mocked function signature will be composed from KeyT as:
-  //   result_type(args...)
-  template <typename KeyT, typename MockURBG>
-  static auto MockFor(MockURBG& m) -> decltype(
-      std::declval<MockURBG>()
-          .template RegisterMock<typename KeySignature<KeyT>::result_type,
-                                 typename KeySignature<KeyT>::arg_tuple_type>(
-              std::declval<IdType>())) {
-    return m.template RegisterMock<typename KeySignature<KeyT>::result_type,
-                                   typename KeySignature<KeyT>::arg_tuple_type>(
-        ::absl::base_internal::FastTypeId<KeyT>());
-  }
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_MOCK_HELPERS_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/mock_overload_set.h b/third_party/abseil_cpp/absl/random/internal/mock_overload_set.h
deleted file mode 100644
index dccc6cee679c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/mock_overload_set.h
+++ /dev/null
@@ -1,97 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
-#define ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
-
-#include <type_traits>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/random/internal/mock_helpers.h"
-#include "absl/random/mocking_bit_gen.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-template <typename DistrT, typename Fn>
-struct MockSingleOverload;
-
-// MockSingleOverload
-//
-// MockSingleOverload hooks in to gMock's `ON_CALL` and `EXPECT_CALL` macros.
-// EXPECT_CALL(mock_single_overload, Call(...))` will expand to a call to
-// `mock_single_overload.gmock_Call(...)`. Because expectations are stored on
-// the MockingBitGen (an argument passed inside `Call(...)`), this forwards to
-// arguments to MockingBitGen::Register.
-//
-// The underlying KeyT must match the KeyT constructed by DistributionCaller.
-template <typename DistrT, typename Ret, typename... Args>
-struct MockSingleOverload<DistrT, Ret(MockingBitGen&, Args...)> {
-  static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
-                "Overload signature must have return type matching the "
-                "distribution result_type.");
-  using KeyT = Ret(DistrT, std::tuple<Args...>);
-  auto gmock_Call(
-      absl::MockingBitGen& gen,  // NOLINT(google-runtime-references)
-      const ::testing::Matcher<Args>&... matchers)
-      -> decltype(MockHelpers::MockFor<KeyT>(gen).gmock_Call(matchers...)) {
-    return MockHelpers::MockFor<KeyT>(gen).gmock_Call(matchers...);
-  }
-};
-
-template <typename DistrT, typename Ret, typename Arg, typename... Args>
-struct MockSingleOverload<DistrT, Ret(Arg, MockingBitGen&, Args...)> {
-  static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
-                "Overload signature must have return type matching the "
-                "distribution result_type.");
-  using KeyT = Ret(DistrT, std::tuple<Arg, Args...>);
-  auto gmock_Call(
-      const ::testing::Matcher<Arg>& matcher,
-      absl::MockingBitGen& gen,  // NOLINT(google-runtime-references)
-      const ::testing::Matcher<Args>&... matchers)
-      -> decltype(MockHelpers::MockFor<KeyT>(gen).gmock_Call(matcher,
-                                                             matchers...)) {
-    return MockHelpers::MockFor<KeyT>(gen).gmock_Call(matcher, matchers...);
-  }
-};
-
-// MockOverloadSet
-//
-// MockOverloadSet takes a distribution and a collection of signatures and
-// performs overload resolution amongst all the overloads. This makes
-// `EXPECT_CALL(mock_overload_set, Call(...))` expand and do overload resolution
-// correctly.
-template <typename DistrT, typename... Signatures>
-struct MockOverloadSet;
-
-template <typename DistrT, typename Sig>
-struct MockOverloadSet<DistrT, Sig> : public MockSingleOverload<DistrT, Sig> {
-  using MockSingleOverload<DistrT, Sig>::gmock_Call;
-};
-
-template <typename DistrT, typename FirstSig, typename... Rest>
-struct MockOverloadSet<DistrT, FirstSig, Rest...>
-    : public MockSingleOverload<DistrT, FirstSig>,
-      public MockOverloadSet<DistrT, Rest...> {
-  using MockSingleOverload<DistrT, FirstSig>::gmock_Call;
-  using MockOverloadSet<DistrT, Rest...>::gmock_Call;
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-#endif  // ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/nanobenchmark.cc b/third_party/abseil_cpp/absl/random/internal/nanobenchmark.cc
deleted file mode 100644
index c9181813f7f0..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/nanobenchmark.cc
+++ /dev/null
@@ -1,804 +0,0 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/nanobenchmark.h"
-
-#include <sys/types.h>
-
-#include <algorithm>  // sort
-#include <atomic>
-#include <cstddef>
-#include <cstdint>
-#include <cstdlib>
-#include <cstring>  // memcpy
-#include <limits>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "absl/base/attributes.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/random/internal/platform.h"
-#include "absl/random/internal/randen_engine.h"
-
-// OS
-#if defined(_WIN32) || defined(_WIN64)
-#define ABSL_OS_WIN
-#include <windows.h>  // NOLINT
-
-#elif defined(__ANDROID__)
-#define ABSL_OS_ANDROID
-
-#elif defined(__linux__)
-#define ABSL_OS_LINUX
-#include <sched.h>        // NOLINT
-#include <sys/syscall.h>  // NOLINT
-#endif
-
-#if defined(ABSL_ARCH_X86_64) && !defined(ABSL_OS_WIN)
-#include <cpuid.h>  // NOLINT
-#endif
-
-// __ppc_get_timebase_freq
-#if defined(ABSL_ARCH_PPC)
-#include <sys/platform/ppc.h>  // NOLINT
-#endif
-
-// clock_gettime
-#if defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
-#include <time.h>  // NOLINT
-#endif
-
-// ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE prevents inlining of the method.
-#if ABSL_HAVE_ATTRIBUTE(noinline) || (defined(__GNUC__) && !defined(__clang__))
-#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE __attribute__((noinline))
-#elif defined(_MSC_VER)
-#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE __declspec(noinline)
-#else
-#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE
-#endif
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal_nanobenchmark {
-namespace {
-
-// For code folding.
-namespace platform {
-#if defined(ABSL_ARCH_X86_64)
-
-// TODO(janwas): Merge with the one in randen_hwaes.cc?
-void Cpuid(const uint32_t level, const uint32_t count,
-           uint32_t* ABSL_RANDOM_INTERNAL_RESTRICT abcd) {
-#if defined(ABSL_OS_WIN)
-  int regs[4];
-  __cpuidex(regs, level, count);
-  for (int i = 0; i < 4; ++i) {
-    abcd[i] = regs[i];
-  }
-#else
-  uint32_t a, b, c, d;
-  __cpuid_count(level, count, a, b, c, d);
-  abcd[0] = a;
-  abcd[1] = b;
-  abcd[2] = c;
-  abcd[3] = d;
-#endif
-}
-
-std::string BrandString() {
-  char brand_string[49];
-  uint32_t abcd[4];
-
-  // Check if brand string is supported (it is on all reasonable Intel/AMD)
-  Cpuid(0x80000000U, 0, abcd);
-  if (abcd[0] < 0x80000004U) {
-    return std::string();
-  }
-
-  for (int i = 0; i < 3; ++i) {
-    Cpuid(0x80000002U + i, 0, abcd);
-    memcpy(brand_string + i * 16, &abcd, sizeof(abcd));
-  }
-  brand_string[48] = 0;
-  return brand_string;
-}
-
-// Returns the frequency quoted inside the brand string. This does not
-// account for throttling nor Turbo Boost.
-double NominalClockRate() {
-  const std::string& brand_string = BrandString();
-  // Brand strings include the maximum configured frequency. These prefixes are
-  // defined by Intel CPUID documentation.
-  const char* prefixes[3] = {"MHz", "GHz", "THz"};
-  const double multipliers[3] = {1E6, 1E9, 1E12};
-  for (size_t i = 0; i < 3; ++i) {
-    const size_t pos_prefix = brand_string.find(prefixes[i]);
-    if (pos_prefix != std::string::npos) {
-      const size_t pos_space = brand_string.rfind(' ', pos_prefix - 1);
-      if (pos_space != std::string::npos) {
-        const std::string digits =
-            brand_string.substr(pos_space + 1, pos_prefix - pos_space - 1);
-        return std::stod(digits) * multipliers[i];
-      }
-    }
-  }
-
-  return 0.0;
-}
-
-#endif  // ABSL_ARCH_X86_64
-}  // namespace platform
-
-// Prevents the compiler from eliding the computations that led to "output".
-template <class T>
-inline void PreventElision(T&& output) {
-#ifndef ABSL_OS_WIN
-  // Works by indicating to the compiler that "output" is being read and
-  // modified. The +r constraint avoids unnecessary writes to memory, but only
-  // works for built-in types (typically FuncOutput).
-  asm volatile("" : "+r"(output) : : "memory");
-#else
-  // MSVC does not support inline assembly anymore (and never supported GCC's
-  // RTL constraints). Self-assignment with #pragma optimize("off") might be
-  // expected to prevent elision, but it does not with MSVC 2015. Type-punning
-  // with volatile pointers generates inefficient code on MSVC 2017.
-  static std::atomic<T> dummy(T{});
-  dummy.store(output, std::memory_order_relaxed);
-#endif
-}
-
-namespace timer {
-
-// Start/Stop return absolute timestamps and must be placed immediately before
-// and after the region to measure. We provide separate Start/Stop functions
-// because they use different fences.
-//
-// Background: RDTSC is not 'serializing'; earlier instructions may complete
-// after it, and/or later instructions may complete before it. 'Fences' ensure
-// regions' elapsed times are independent of such reordering. The only
-// documented unprivileged serializing instruction is CPUID, which acts as a
-// full fence (no reordering across it in either direction). Unfortunately
-// the latency of CPUID varies wildly (perhaps made worse by not initializing
-// its EAX input). Because it cannot reliably be deducted from the region's
-// elapsed time, it must not be included in the region to measure (i.e.
-// between the two RDTSC).
-//
-// The newer RDTSCP is sometimes described as serializing, but it actually
-// only serves as a half-fence with release semantics. Although all
-// instructions in the region will complete before the final timestamp is
-// captured, subsequent instructions may leak into the region and increase the
-// elapsed time. Inserting another fence after the final RDTSCP would prevent
-// such reordering without affecting the measured region.
-//
-// Fortunately, such a fence exists. The LFENCE instruction is only documented
-// to delay later loads until earlier loads are visible. However, Intel's
-// reference manual says it acts as a full fence (waiting until all earlier
-// instructions have completed, and delaying later instructions until it
-// completes). AMD assigns the same behavior to MFENCE.
-//
-// We need a fence before the initial RDTSC to prevent earlier instructions
-// from leaking into the region, and arguably another after RDTSC to avoid
-// region instructions from completing before the timestamp is recorded.
-// When surrounded by fences, the additional RDTSCP half-fence provides no
-// benefit, so the initial timestamp can be recorded via RDTSC, which has
-// lower overhead than RDTSCP because it does not read TSC_AUX. In summary,
-// we define Start = LFENCE/RDTSC/LFENCE; Stop = RDTSCP/LFENCE.
-//
-// Using Start+Start leads to higher variance and overhead than Stop+Stop.
-// However, Stop+Stop includes an LFENCE in the region measurements, which
-// adds a delay dependent on earlier loads. The combination of Start+Stop
-// is faster than Start+Start and more consistent than Stop+Stop because
-// the first LFENCE already delayed subsequent loads before the measured
-// region. This combination seems not to have been considered in prior work:
-// http://akaros.cs.berkeley.edu/lxr/akaros/kern/arch/x86/rdtsc_test.c
-//
-// Note: performance counters can measure 'exact' instructions-retired or
-// (unhalted) cycle counts. The RDPMC instruction is not serializing and also
-// requires fences. Unfortunately, it is not accessible on all OSes and we
-// prefer to avoid kernel-mode drivers. Performance counters are also affected
-// by several under/over-count errata, so we use the TSC instead.
-
-// Returns a 64-bit timestamp in unit of 'ticks'; to convert to seconds,
-// divide by InvariantTicksPerSecond.
-inline uint64_t Start64() {
-  uint64_t t;
-#if defined(ABSL_ARCH_PPC)
-  asm volatile("mfspr %0, %1" : "=r"(t) : "i"(268));
-#elif defined(ABSL_ARCH_X86_64)
-#if defined(ABSL_OS_WIN)
-  _ReadWriteBarrier();
-  _mm_lfence();
-  _ReadWriteBarrier();
-  t = __rdtsc();
-  _ReadWriteBarrier();
-  _mm_lfence();
-  _ReadWriteBarrier();
-#else
-  asm volatile(
-      "lfence\n\t"
-      "rdtsc\n\t"
-      "shl $32, %%rdx\n\t"
-      "or %%rdx, %0\n\t"
-      "lfence"
-      : "=a"(t)
-      :
-      // "memory" avoids reordering. rdx = TSC >> 32.
-      // "cc" = flags modified by SHL.
-      : "rdx", "memory", "cc");
-#endif
-#else
-  // Fall back to OS - unsure how to reliably query cntvct_el0 frequency.
-  timespec ts;
-  clock_gettime(CLOCK_REALTIME, &ts);
-  t = ts.tv_sec * 1000000000LL + ts.tv_nsec;
-#endif
-  return t;
-}
-
-inline uint64_t Stop64() {
-  uint64_t t;
-#if defined(ABSL_ARCH_X86_64)
-#if defined(ABSL_OS_WIN)
-  _ReadWriteBarrier();
-  unsigned aux;
-  t = __rdtscp(&aux);
-  _ReadWriteBarrier();
-  _mm_lfence();
-  _ReadWriteBarrier();
-#else
-  // Use inline asm because __rdtscp generates code to store TSC_AUX (ecx).
-  asm volatile(
-      "rdtscp\n\t"
-      "shl $32, %%rdx\n\t"
-      "or %%rdx, %0\n\t"
-      "lfence"
-      : "=a"(t)
-      :
-      // "memory" avoids reordering. rcx = TSC_AUX. rdx = TSC >> 32.
-      // "cc" = flags modified by SHL.
-      : "rcx", "rdx", "memory", "cc");
-#endif
-#else
-  t = Start64();
-#endif
-  return t;
-}
-
-// Returns a 32-bit timestamp with about 4 cycles less overhead than
-// Start64. Only suitable for measuring very short regions because the
-// timestamp overflows about once a second.
-inline uint32_t Start32() {
-  uint32_t t;
-#if defined(ABSL_ARCH_X86_64)
-#if defined(ABSL_OS_WIN)
-  _ReadWriteBarrier();
-  _mm_lfence();
-  _ReadWriteBarrier();
-  t = static_cast<uint32_t>(__rdtsc());
-  _ReadWriteBarrier();
-  _mm_lfence();
-  _ReadWriteBarrier();
-#else
-  asm volatile(
-      "lfence\n\t"
-      "rdtsc\n\t"
-      "lfence"
-      : "=a"(t)
-      :
-      // "memory" avoids reordering. rdx = TSC >> 32.
-      : "rdx", "memory");
-#endif
-#else
-  t = static_cast<uint32_t>(Start64());
-#endif
-  return t;
-}
-
-inline uint32_t Stop32() {
-  uint32_t t;
-#if defined(ABSL_ARCH_X86_64)
-#if defined(ABSL_OS_WIN)
-  _ReadWriteBarrier();
-  unsigned aux;
-  t = static_cast<uint32_t>(__rdtscp(&aux));
-  _ReadWriteBarrier();
-  _mm_lfence();
-  _ReadWriteBarrier();
-#else
-  // Use inline asm because __rdtscp generates code to store TSC_AUX (ecx).
-  asm volatile(
-      "rdtscp\n\t"
-      "lfence"
-      : "=a"(t)
-      :
-      // "memory" avoids reordering. rcx = TSC_AUX. rdx = TSC >> 32.
-      : "rcx", "rdx", "memory");
-#endif
-#else
-  t = static_cast<uint32_t>(Stop64());
-#endif
-  return t;
-}
-
-}  // namespace timer
-
-namespace robust_statistics {
-
-// Sorts integral values in ascending order (e.g. for Mode). About 3x faster
-// than std::sort for input distributions with very few unique values.
-template <class T>
-void CountingSort(T* values, size_t num_values) {
-  // Unique values and their frequency (similar to flat_map).
-  using Unique = std::pair<T, int>;
-  std::vector<Unique> unique;
-  for (size_t i = 0; i < num_values; ++i) {
-    const T value = values[i];
-    const auto pos =
-        std::find_if(unique.begin(), unique.end(),
-                     [value](const Unique u) { return u.first == value; });
-    if (pos == unique.end()) {
-      unique.push_back(std::make_pair(value, 1));
-    } else {
-      ++pos->second;
-    }
-  }
-
-  // Sort in ascending order of value (pair.first).
-  std::sort(unique.begin(), unique.end());
-
-  // Write that many copies of each unique value to the array.
-  T* ABSL_RANDOM_INTERNAL_RESTRICT p = values;
-  for (const auto& value_count : unique) {
-    std::fill(p, p + value_count.second, value_count.first);
-    p += value_count.second;
-  }
-  ABSL_RAW_CHECK(p == values + num_values, "Did not produce enough output");
-}
-
-// @return i in [idx_begin, idx_begin + half_count) that minimizes
-// sorted[i + half_count] - sorted[i].
-template <typename T>
-size_t MinRange(const T* const ABSL_RANDOM_INTERNAL_RESTRICT sorted,
-                const size_t idx_begin, const size_t half_count) {
-  T min_range = (std::numeric_limits<T>::max)();
-  size_t min_idx = 0;
-
-  for (size_t idx = idx_begin; idx < idx_begin + half_count; ++idx) {
-    ABSL_RAW_CHECK(sorted[idx] <= sorted[idx + half_count], "Not sorted");
-    const T range = sorted[idx + half_count] - sorted[idx];
-    if (range < min_range) {
-      min_range = range;
-      min_idx = idx;
-    }
-  }
-
-  return min_idx;
-}
-
-// Returns an estimate of the mode by calling MinRange on successively
-// halved intervals. "sorted" must be in ascending order. This is the
-// Half Sample Mode estimator proposed by Bickel in "On a fast, robust
-// estimator of the mode", with complexity O(N log N). The mode is less
-// affected by outliers in highly-skewed distributions than the median.
-// The averaging operation below assumes "T" is an unsigned integer type.
-template <typename T>
-T ModeOfSorted(const T* const ABSL_RANDOM_INTERNAL_RESTRICT sorted,
-               const size_t num_values) {
-  size_t idx_begin = 0;
-  size_t half_count = num_values / 2;
-  while (half_count > 1) {
-    idx_begin = MinRange(sorted, idx_begin, half_count);
-    half_count >>= 1;
-  }
-
-  const T x = sorted[idx_begin + 0];
-  if (half_count == 0) {
-    return x;
-  }
-  ABSL_RAW_CHECK(half_count == 1, "Should stop at half_count=1");
-  const T average = (x + sorted[idx_begin + 1] + 1) / 2;
-  return average;
-}
-
-// Returns the mode. Side effect: sorts "values".
-template <typename T>
-T Mode(T* values, const size_t num_values) {
-  CountingSort(values, num_values);
-  return ModeOfSorted(values, num_values);
-}
-
-template <typename T, size_t N>
-T Mode(T (&values)[N]) {
-  return Mode(&values[0], N);
-}
-
-// Returns the median value. Side effect: sorts "values".
-template <typename T>
-T Median(T* values, const size_t num_values) {
-  ABSL_RAW_CHECK(num_values != 0, "Empty input");
-  std::sort(values, values + num_values);
-  const size_t half = num_values / 2;
-  // Odd count: return middle
-  if (num_values % 2) {
-    return values[half];
-  }
-  // Even count: return average of middle two.
-  return (values[half] + values[half - 1] + 1) / 2;
-}
-
-// Returns a robust measure of variability.
-template <typename T>
-T MedianAbsoluteDeviation(const T* values, const size_t num_values,
-                          const T median) {
-  ABSL_RAW_CHECK(num_values != 0, "Empty input");
-  std::vector<T> abs_deviations;
-  abs_deviations.reserve(num_values);
-  for (size_t i = 0; i < num_values; ++i) {
-    const int64_t abs = std::abs(int64_t(values[i]) - int64_t(median));
-    abs_deviations.push_back(static_cast<T>(abs));
-  }
-  return Median(abs_deviations.data(), num_values);
-}
-
-}  // namespace robust_statistics
-
-// Ticks := platform-specific timer values (CPU cycles on x86). Must be
-// unsigned to guarantee wraparound on overflow. 32 bit timers are faster to
-// read than 64 bit.
-using Ticks = uint32_t;
-
-// Returns timer overhead / minimum measurable difference.
-Ticks TimerResolution() {
-  // Nested loop avoids exceeding stack/L1 capacity.
-  Ticks repetitions[Params::kTimerSamples];
-  for (size_t rep = 0; rep < Params::kTimerSamples; ++rep) {
-    Ticks samples[Params::kTimerSamples];
-    for (size_t i = 0; i < Params::kTimerSamples; ++i) {
-      const Ticks t0 = timer::Start32();
-      const Ticks t1 = timer::Stop32();
-      samples[i] = t1 - t0;
-    }
-    repetitions[rep] = robust_statistics::Mode(samples);
-  }
-  return robust_statistics::Mode(repetitions);
-}
-
-static const Ticks timer_resolution = TimerResolution();
-
-// Estimates the expected value of "lambda" values with a variable number of
-// samples until the variability "rel_mad" is less than "max_rel_mad".
-template <class Lambda>
-Ticks SampleUntilStable(const double max_rel_mad, double* rel_mad,
-                        const Params& p, const Lambda& lambda) {
-  auto measure_duration = [&lambda]() -> Ticks {
-    const Ticks t0 = timer::Start32();
-    lambda();
-    const Ticks t1 = timer::Stop32();
-    return t1 - t0;
-  };
-
-  // Choose initial samples_per_eval based on a single estimated duration.
-  Ticks est = measure_duration();
-  static const double ticks_per_second = InvariantTicksPerSecond();
-  const size_t ticks_per_eval = ticks_per_second * p.seconds_per_eval;
-  size_t samples_per_eval = ticks_per_eval / est;
-  samples_per_eval = (std::max)(samples_per_eval, p.min_samples_per_eval);
-
-  std::vector<Ticks> samples;
-  samples.reserve(1 + samples_per_eval);
-  samples.push_back(est);
-
-  // Percentage is too strict for tiny differences, so also allow a small
-  // absolute "median absolute deviation".
-  const Ticks max_abs_mad = (timer_resolution + 99) / 100;
-  *rel_mad = 0.0;  // ensure initialized
-
-  for (size_t eval = 0; eval < p.max_evals; ++eval, samples_per_eval *= 2) {
-    samples.reserve(samples.size() + samples_per_eval);
-    for (size_t i = 0; i < samples_per_eval; ++i) {
-      const Ticks r = measure_duration();
-      samples.push_back(r);
-    }
-
-    if (samples.size() >= p.min_mode_samples) {
-      est = robust_statistics::Mode(samples.data(), samples.size());
-    } else {
-      // For "few" (depends also on the variance) samples, Median is safer.
-      est = robust_statistics::Median(samples.data(), samples.size());
-    }
-    ABSL_RAW_CHECK(est != 0, "Estimator returned zero duration");
-
-    // Median absolute deviation (mad) is a robust measure of 'variability'.
-    const Ticks abs_mad = robust_statistics::MedianAbsoluteDeviation(
-        samples.data(), samples.size(), est);
-    *rel_mad = static_cast<double>(static_cast<int>(abs_mad)) / est;
-
-    if (*rel_mad <= max_rel_mad || abs_mad <= max_abs_mad) {
-      if (p.verbose) {
-        ABSL_RAW_LOG(INFO,
-                     "%6zu samples => %5u (abs_mad=%4u, rel_mad=%4.2f%%)\n",
-                     samples.size(), est, abs_mad, *rel_mad * 100.0);
-      }
-      return est;
-    }
-  }
-
-  if (p.verbose) {
-    ABSL_RAW_LOG(WARNING,
-                 "rel_mad=%4.2f%% still exceeds %4.2f%% after %6zu samples.\n",
-                 *rel_mad * 100.0, max_rel_mad * 100.0, samples.size());
-  }
-  return est;
-}
-
-using InputVec = std::vector<FuncInput>;
-
-// Returns vector of unique input values.
-InputVec UniqueInputs(const FuncInput* inputs, const size_t num_inputs) {
-  InputVec unique(inputs, inputs + num_inputs);
-  std::sort(unique.begin(), unique.end());
-  unique.erase(std::unique(unique.begin(), unique.end()), unique.end());
-  return unique;
-}
-
-// Returns how often we need to call func for sufficient precision, or zero
-// on failure (e.g. the elapsed time is too long for a 32-bit tick count).
-size_t NumSkip(const Func func, const void* arg, const InputVec& unique,
-               const Params& p) {
-  // Min elapsed ticks for any input.
-  Ticks min_duration = ~0u;
-
-  for (const FuncInput input : unique) {
-    // Make sure a 32-bit timer is sufficient.
-    const uint64_t t0 = timer::Start64();
-    PreventElision(func(arg, input));
-    const uint64_t t1 = timer::Stop64();
-    const uint64_t elapsed = t1 - t0;
-    if (elapsed >= (1ULL << 30)) {
-      ABSL_RAW_LOG(WARNING,
-                   "Measurement failed: need 64-bit timer for input=%zu\n",
-                   static_cast<size_t>(input));
-      return 0;
-    }
-
-    double rel_mad;
-    const Ticks total = SampleUntilStable(
-        p.target_rel_mad, &rel_mad, p,
-        [func, arg, input]() { PreventElision(func(arg, input)); });
-    min_duration = (std::min)(min_duration, total - timer_resolution);
-  }
-
-  // Number of repetitions required to reach the target resolution.
-  const size_t max_skip = p.precision_divisor;
-  // Number of repetitions given the estimated duration.
-  const size_t num_skip =
-      min_duration == 0 ? 0 : (max_skip + min_duration - 1) / min_duration;
-  if (p.verbose) {
-    ABSL_RAW_LOG(INFO, "res=%u max_skip=%zu min_dur=%u num_skip=%zu\n",
-                 timer_resolution, max_skip, min_duration, num_skip);
-  }
-  return num_skip;
-}
-
-// Replicates inputs until we can omit "num_skip" occurrences of an input.
-InputVec ReplicateInputs(const FuncInput* inputs, const size_t num_inputs,
-                         const size_t num_unique, const size_t num_skip,
-                         const Params& p) {
-  InputVec full;
-  if (num_unique == 1) {
-    full.assign(p.subset_ratio * num_skip, inputs[0]);
-    return full;
-  }
-
-  full.reserve(p.subset_ratio * num_skip * num_inputs);
-  for (size_t i = 0; i < p.subset_ratio * num_skip; ++i) {
-    full.insert(full.end(), inputs, inputs + num_inputs);
-  }
-  absl::random_internal::randen_engine<uint32_t> rng;
-  std::shuffle(full.begin(), full.end(), rng);
-  return full;
-}
-
-// Copies the "full" to "subset" in the same order, but with "num_skip"
-// randomly selected occurrences of "input_to_skip" removed.
-void FillSubset(const InputVec& full, const FuncInput input_to_skip,
-                const size_t num_skip, InputVec* subset) {
-  const size_t count = std::count(full.begin(), full.end(), input_to_skip);
-  // Generate num_skip random indices: which occurrence to skip.
-  std::vector<uint32_t> omit;
-  // Replacement for std::iota, not yet available in MSVC builds.
-  omit.reserve(count);
-  for (size_t i = 0; i < count; ++i) {
-    omit.push_back(i);
-  }
-  // omit[] is the same on every call, but that's OK because they identify the
-  // Nth instance of input_to_skip, so the position within full[] differs.
-  absl::random_internal::randen_engine<uint32_t> rng;
-  std::shuffle(omit.begin(), omit.end(), rng);
-  omit.resize(num_skip);
-  std::sort(omit.begin(), omit.end());
-
-  uint32_t occurrence = ~0u;  // 0 after preincrement
-  size_t idx_omit = 0;        // cursor within omit[]
-  size_t idx_subset = 0;      // cursor within *subset
-  for (const FuncInput next : full) {
-    if (next == input_to_skip) {
-      ++occurrence;
-      // Haven't removed enough already
-      if (idx_omit < num_skip) {
-        // This one is up for removal
-        if (occurrence == omit[idx_omit]) {
-          ++idx_omit;
-          continue;
-        }
-      }
-    }
-    if (idx_subset < subset->size()) {
-      (*subset)[idx_subset++] = next;
-    }
-  }
-  ABSL_RAW_CHECK(idx_subset == subset->size(), "idx_subset not at end");
-  ABSL_RAW_CHECK(idx_omit == omit.size(), "idx_omit not at end");
-  ABSL_RAW_CHECK(occurrence == count - 1, "occurrence not at end");
-}
-
-// Returns total ticks elapsed for all inputs.
-Ticks TotalDuration(const Func func, const void* arg, const InputVec* inputs,
-                    const Params& p, double* max_rel_mad) {
-  double rel_mad;
-  const Ticks duration =
-      SampleUntilStable(p.target_rel_mad, &rel_mad, p, [func, arg, inputs]() {
-        for (const FuncInput input : *inputs) {
-          PreventElision(func(arg, input));
-        }
-      });
-  *max_rel_mad = (std::max)(*max_rel_mad, rel_mad);
-  return duration;
-}
-
-// (Nearly) empty Func for measuring timer overhead/resolution.
-ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE FuncOutput
-EmptyFunc(const void* arg, const FuncInput input) {
-  return input;
-}
-
-// Returns overhead of accessing inputs[] and calling a function; this will
-// be deducted from future TotalDuration return values.
-Ticks Overhead(const void* arg, const InputVec* inputs, const Params& p) {
-  double rel_mad;
-  // Zero tolerance because repeatability is crucial and EmptyFunc is fast.
-  return SampleUntilStable(0.0, &rel_mad, p, [arg, inputs]() {
-    for (const FuncInput input : *inputs) {
-      PreventElision(EmptyFunc(arg, input));
-    }
-  });
-}
-
-}  // namespace
-
-void PinThreadToCPU(int cpu) {
-  // We might migrate to another CPU before pinning below, but at least cpu
-  // will be one of the CPUs on which this thread ran.
-#if defined(ABSL_OS_WIN)
-  if (cpu < 0) {
-    cpu = static_cast<int>(GetCurrentProcessorNumber());
-    ABSL_RAW_CHECK(cpu >= 0, "PinThreadToCPU detect failed");
-    if (cpu >= 64) {
-      // NOTE: On wine, at least, GetCurrentProcessorNumber() sometimes returns
-      // a value > 64, which is out of range. When this happens, log a message
-      // and don't set a cpu affinity.
-      ABSL_RAW_LOG(ERROR, "Invalid CPU number: %d", cpu);
-      return;
-    }
-  } else if (cpu >= 64) {
-    // User specified an explicit CPU affinity > the valid range.
-    ABSL_RAW_LOG(FATAL, "Invalid CPU number: %d", cpu);
-  }
-  const DWORD_PTR prev = SetThreadAffinityMask(GetCurrentThread(), 1ULL << cpu);
-  ABSL_RAW_CHECK(prev != 0, "SetAffinity failed");
-#elif defined(ABSL_OS_LINUX) && !defined(ABSL_OS_ANDROID)
-  if (cpu < 0) {
-    cpu = sched_getcpu();
-    ABSL_RAW_CHECK(cpu >= 0, "PinThreadToCPU detect failed");
-  }
-  const pid_t pid = 0;  // current thread
-  cpu_set_t set;
-  CPU_ZERO(&set);
-  CPU_SET(cpu, &set);
-  const int err = sched_setaffinity(pid, sizeof(set), &set);
-  ABSL_RAW_CHECK(err == 0, "SetAffinity failed");
-#endif
-}
-
-// Returns tick rate. Invariant means the tick counter frequency is independent
-// of CPU throttling or sleep. May be expensive, caller should cache the result.
-double InvariantTicksPerSecond() {
-#if defined(ABSL_ARCH_PPC)
-  return __ppc_get_timebase_freq();
-#elif defined(ABSL_ARCH_X86_64)
-  // We assume the TSC is invariant; it is on all recent Intel/AMD CPUs.
-  return platform::NominalClockRate();
-#else
-  // Fall back to clock_gettime nanoseconds.
-  return 1E9;
-#endif
-}
-
-size_t MeasureImpl(const Func func, const void* arg, const size_t num_skip,
-                   const InputVec& unique, const InputVec& full,
-                   const Params& p, Result* results) {
-  const float mul = 1.0f / static_cast<int>(num_skip);
-
-  InputVec subset(full.size() - num_skip);
-  const Ticks overhead = Overhead(arg, &full, p);
-  const Ticks overhead_skip = Overhead(arg, &subset, p);
-  if (overhead < overhead_skip) {
-    ABSL_RAW_LOG(WARNING, "Measurement failed: overhead %u < %u\n", overhead,
-                 overhead_skip);
-    return 0;
-  }
-
-  if (p.verbose) {
-    ABSL_RAW_LOG(INFO, "#inputs=%5zu,%5zu overhead=%5u,%5u\n", full.size(),
-                 subset.size(), overhead, overhead_skip);
-  }
-
-  double max_rel_mad = 0.0;
-  const Ticks total = TotalDuration(func, arg, &full, p, &max_rel_mad);
-
-  for (size_t i = 0; i < unique.size(); ++i) {
-    FillSubset(full, unique[i], num_skip, &subset);
-    const Ticks total_skip = TotalDuration(func, arg, &subset, p, &max_rel_mad);
-
-    if (total < total_skip) {
-      ABSL_RAW_LOG(WARNING, "Measurement failed: total %u < %u\n", total,
-                   total_skip);
-      return 0;
-    }
-
-    const Ticks duration = (total - overhead) - (total_skip - overhead_skip);
-    results[i].input = unique[i];
-    results[i].ticks = duration * mul;
-    results[i].variability = max_rel_mad;
-  }
-
-  return unique.size();
-}
-
-size_t Measure(const Func func, const void* arg, const FuncInput* inputs,
-               const size_t num_inputs, Result* results, const Params& p) {
-  ABSL_RAW_CHECK(num_inputs != 0, "No inputs");
-
-  const InputVec unique = UniqueInputs(inputs, num_inputs);
-  const size_t num_skip = NumSkip(func, arg, unique, p);  // never 0
-  if (num_skip == 0) return 0;  // NumSkip already printed error message
-
-  const InputVec full =
-      ReplicateInputs(inputs, num_inputs, unique.size(), num_skip, p);
-
-  // MeasureImpl may fail up to p.max_measure_retries times.
-  for (size_t i = 0; i < p.max_measure_retries; i++) {
-    auto result = MeasureImpl(func, arg, num_skip, unique, full, p, results);
-    if (result != 0) {
-      return result;
-    }
-  }
-  // All retries failed. (Unusual)
-  return 0;
-}
-
-}  // namespace random_internal_nanobenchmark
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/nanobenchmark.h b/third_party/abseil_cpp/absl/random/internal/nanobenchmark.h
deleted file mode 100644
index a5097ba27b0f..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/nanobenchmark.h
+++ /dev/null
@@ -1,172 +0,0 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_NANOBENCHMARK_H_
-#define ABSL_RANDOM_INTERNAL_NANOBENCHMARK_H_
-
-// Benchmarks functions of a single integer argument with realistic branch
-// prediction hit rates. Uses a robust estimator to summarize the measurements.
-// The precision is about 0.2%.
-//
-// Examples: see nanobenchmark_test.cc.
-//
-// Background: Microbenchmarks such as http://github.com/google/benchmark
-// can measure elapsed times on the order of a microsecond. Shorter functions
-// are typically measured by repeating them thousands of times and dividing
-// the total elapsed time by this count. Unfortunately, repetition (especially
-// with the same input parameter!) influences the runtime. In time-critical
-// code, it is reasonable to expect warm instruction/data caches and TLBs,
-// but a perfect record of which branches will be taken is unrealistic.
-// Unless the application also repeatedly invokes the measured function with
-// the same parameter, the benchmark is measuring something very different -
-// a best-case result, almost as if the parameter were made a compile-time
-// constant. This may lead to erroneous conclusions about branch-heavy
-// algorithms outperforming branch-free alternatives.
-//
-// Our approach differs in three ways. Adding fences to the timer functions
-// reduces variability due to instruction reordering, improving the timer
-// resolution to about 40 CPU cycles. However, shorter functions must still
-// be invoked repeatedly. For more realistic branch prediction performance,
-// we vary the input parameter according to a user-specified distribution.
-// Thus, instead of VaryInputs(Measure(Repeat(func))), we change the
-// loop nesting to Measure(Repeat(VaryInputs(func))). We also estimate the
-// central tendency of the measurement samples with the "half sample mode",
-// which is more robust to outliers and skewed data than the mean or median.
-
-// NOTE: for compatibility with multiple translation units compiled with
-// distinct flags, avoid #including headers that define functions.
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal_nanobenchmark {
-
-// Input influencing the function being measured (e.g. number of bytes to copy).
-using FuncInput = size_t;
-
-// "Proof of work" returned by Func to ensure the compiler does not elide it.
-using FuncOutput = uint64_t;
-
-// Function to measure: either 1) a captureless lambda or function with two
-// arguments or 2) a lambda with capture, in which case the first argument
-// is reserved for use by MeasureClosure.
-using Func = FuncOutput (*)(const void*, FuncInput);
-
-// Internal parameters that determine precision/resolution/measuring time.
-struct Params {
-  // For measuring timer overhead/resolution. Used in a nested loop =>
-  // quadratic time, acceptable because we know timer overhead is "low".
-  // constexpr because this is used to define array bounds.
-  static constexpr size_t kTimerSamples = 256;
-
-  // Best-case precision, expressed as a divisor of the timer resolution.
-  // Larger => more calls to Func and higher precision.
-  size_t precision_divisor = 1024;
-
-  // Ratio between full and subset input distribution sizes. Cannot be less
-  // than 2; larger values increase measurement time but more faithfully
-  // model the given input distribution.
-  size_t subset_ratio = 2;
-
-  // Together with the estimated Func duration, determines how many times to
-  // call Func before checking the sample variability. Larger values increase
-  // measurement time, memory/cache use and precision.
-  double seconds_per_eval = 4E-3;
-
-  // The minimum number of samples before estimating the central tendency.
-  size_t min_samples_per_eval = 7;
-
-  // The mode is better than median for estimating the central tendency of
-  // skewed/fat-tailed distributions, but it requires sufficient samples
-  // relative to the width of half-ranges.
-  size_t min_mode_samples = 64;
-
-  // Maximum permissible variability (= median absolute deviation / center).
-  double target_rel_mad = 0.002;
-
-  // Abort after this many evals without reaching target_rel_mad. This
-  // prevents infinite loops.
-  size_t max_evals = 9;
-
-  // Retry the measure loop up to this many times.
-  size_t max_measure_retries = 2;
-
-  // Whether to print additional statistics to stdout.
-  bool verbose = true;
-};
-
-// Measurement result for each unique input.
-struct Result {
-  FuncInput input;
-
-  // Robust estimate (mode or median) of duration.
-  float ticks;
-
-  // Measure of variability (median absolute deviation relative to "ticks").
-  float variability;
-};
-
-// Ensures the thread is running on the specified cpu, and no others.
-// Reduces noise due to desynchronized socket RDTSC and context switches.
-// If "cpu" is negative, pin to the currently running core.
-void PinThreadToCPU(const int cpu = -1);
-
-// Returns tick rate, useful for converting measurements to seconds. Invariant
-// means the tick counter frequency is independent of CPU throttling or sleep.
-// This call may be expensive, callers should cache the result.
-double InvariantTicksPerSecond();
-
-// Precisely measures the number of ticks elapsed when calling "func" with the
-// given inputs, shuffled to ensure realistic branch prediction hit rates.
-//
-// "func" returns a 'proof of work' to ensure its computations are not elided.
-// "arg" is passed to Func, or reserved for internal use by MeasureClosure.
-// "inputs" is an array of "num_inputs" (not necessarily unique) arguments to
-//   "func". The values should be chosen to maximize coverage of "func". This
-//   represents a distribution, so a value's frequency should reflect its
-//   probability in the real application. Order does not matter; for example, a
-//   uniform distribution over [0, 4) could be represented as {3,0,2,1}.
-// Returns how many Result were written to "results": one per unique input, or
-//   zero if the measurement failed (an error message goes to stderr).
-size_t Measure(const Func func, const void* arg, const FuncInput* inputs,
-               const size_t num_inputs, Result* results,
-               const Params& p = Params());
-
-// Calls operator() of the given closure (lambda function).
-template <class Closure>
-static FuncOutput CallClosure(const void* f, const FuncInput input) {
-  return (*reinterpret_cast<const Closure*>(f))(input);
-}
-
-// Same as Measure, except "closure" is typically a lambda function of
-// FuncInput -> FuncOutput with a capture list.
-template <class Closure>
-static inline size_t MeasureClosure(const Closure& closure,
-                                    const FuncInput* inputs,
-                                    const size_t num_inputs, Result* results,
-                                    const Params& p = Params()) {
-  return Measure(reinterpret_cast<Func>(&CallClosure<Closure>),
-                 reinterpret_cast<const void*>(&closure), inputs, num_inputs,
-                 results, p);
-}
-
-}  // namespace random_internal_nanobenchmark
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_NANOBENCHMARK_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/nanobenchmark_test.cc b/third_party/abseil_cpp/absl/random/internal/nanobenchmark_test.cc
deleted file mode 100644
index f1571e269ff5..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/nanobenchmark_test.cc
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/nanobenchmark.h"
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/strings/numbers.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal_nanobenchmark {
-namespace {
-
-uint64_t Div(const void*, FuncInput in) {
-  // Here we're measuring the throughput because benchmark invocations are
-  // independent.
-  const int64_t d1 = 0xFFFFFFFFFFll / int64_t(in);  // IDIV
-  return d1;
-}
-
-template <size_t N>
-void MeasureDiv(const FuncInput (&inputs)[N]) {
-  Result results[N];
-  Params params;
-  params.max_evals = 6;  // avoid test timeout
-  const size_t num_results = Measure(&Div, nullptr, inputs, N, results, params);
-  if (num_results == 0) {
-    ABSL_RAW_LOG(
-        WARNING,
-        "WARNING: Measurement failed, should not happen when using "
-        "PinThreadToCPU unless the region to measure takes > 1 second.\n");
-    return;
-  }
-  for (size_t i = 0; i < num_results; ++i) {
-    ABSL_RAW_LOG(INFO, "%5zu: %6.2f ticks; MAD=%4.2f%%\n", results[i].input,
-                 results[i].ticks, results[i].variability * 100.0);
-    ABSL_RAW_CHECK(results[i].ticks != 0.0f, "Zero duration");
-  }
-}
-
-void RunAll(const int argc, char* argv[]) {
-  // Avoid migrating between cores - important on multi-socket systems.
-  int cpu = -1;
-  if (argc == 2) {
-    if (!absl::SimpleAtoi(argv[1], &cpu)) {
-      ABSL_RAW_LOG(FATAL, "The optional argument must be a CPU number >= 0.\n");
-    }
-  }
-  PinThreadToCPU(cpu);
-
-  // unpredictable == 1 but the compiler doesn't know that.
-  const FuncInput unpredictable = argc != 999;
-  static const FuncInput inputs[] = {unpredictable * 10, unpredictable * 100};
-
-  MeasureDiv(inputs);
-}
-
-}  // namespace
-}  // namespace random_internal_nanobenchmark
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-int main(int argc, char* argv[]) {
-  absl::random_internal_nanobenchmark::RunAll(argc, argv);
-  return 0;
-}
diff --git a/third_party/abseil_cpp/absl/random/internal/nonsecure_base.h b/third_party/abseil_cpp/absl/random/internal/nonsecure_base.h
deleted file mode 100644
index 730fa2ea12d2..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/nonsecure_base.h
+++ /dev/null
@@ -1,150 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_NONSECURE_BASE_H_
-#define ABSL_RANDOM_INTERNAL_NONSECURE_BASE_H_
-
-#include <algorithm>
-#include <cstdint>
-#include <iostream>
-#include <iterator>
-#include <random>
-#include <string>
-#include <type_traits>
-#include <vector>
-
-#include "absl/base/macros.h"
-#include "absl/meta/type_traits.h"
-#include "absl/random/internal/pool_urbg.h"
-#include "absl/random/internal/salted_seed_seq.h"
-#include "absl/random/internal/seed_material.h"
-#include "absl/types/optional.h"
-#include "absl/types/span.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// Each instance of NonsecureURBGBase<URBG> will be seeded by variates produced
-// by a thread-unique URBG-instance.
-template <typename URBG>
-class NonsecureURBGBase {
- public:
-  using result_type = typename URBG::result_type;
-
-  // Default constructor
-  NonsecureURBGBase() : urbg_(ConstructURBG()) {}
-
-  // Copy disallowed, move allowed.
-  NonsecureURBGBase(const NonsecureURBGBase&) = delete;
-  NonsecureURBGBase& operator=(const NonsecureURBGBase&) = delete;
-  NonsecureURBGBase(NonsecureURBGBase&&) = default;
-  NonsecureURBGBase& operator=(NonsecureURBGBase&&) = default;
-
-  // Constructor using a seed
-  template <class SSeq, typename = typename absl::enable_if_t<
-                            !std::is_same<SSeq, NonsecureURBGBase>::value>>
-  explicit NonsecureURBGBase(SSeq&& seq)
-      : urbg_(ConstructURBG(std::forward<SSeq>(seq))) {}
-
-  // Note: on MSVC, min() or max() can be interpreted as MIN() or MAX(), so we
-  // enclose min() or max() in parens as (min)() and (max)().
-  // Additionally, clang-format requires no space before this construction.
-
-  // NonsecureURBGBase::min()
-  static constexpr result_type(min)() { return (URBG::min)(); }
-
-  // NonsecureURBGBase::max()
-  static constexpr result_type(max)() { return (URBG::max)(); }
-
-  // NonsecureURBGBase::operator()()
-  result_type operator()() { return urbg_(); }
-
-  // NonsecureURBGBase::discard()
-  void discard(unsigned long long values) {  // NOLINT(runtime/int)
-    urbg_.discard(values);
-  }
-
-  bool operator==(const NonsecureURBGBase& other) const {
-    return urbg_ == other.urbg_;
-  }
-
-  bool operator!=(const NonsecureURBGBase& other) const {
-    return !(urbg_ == other.urbg_);
-  }
-
- private:
-  // Seeder is a custom seed sequence type where generate() fills the provided
-  // buffer via the RandenPool entropy source.
-  struct Seeder {
-    using result_type = uint32_t;
-
-    size_t size() { return 0; }
-
-    template <typename OutIterator>
-    void param(OutIterator) const {}
-
-    template <typename RandomAccessIterator>
-    void generate(RandomAccessIterator begin, RandomAccessIterator end) {
-      if (begin != end) {
-        // begin, end must be random access iterators assignable from uint32_t.
-        generate_impl(
-            std::integral_constant<bool, sizeof(*begin) == sizeof(uint32_t)>{},
-            begin, end);
-      }
-    }
-
-    // Commonly, generate is invoked with a pointer to a buffer which
-    // can be cast to a uint32_t.
-    template <typename RandomAccessIterator>
-    void generate_impl(std::integral_constant<bool, true>,
-                       RandomAccessIterator begin, RandomAccessIterator end) {
-      auto buffer = absl::MakeSpan(begin, end);
-      auto target = absl::MakeSpan(reinterpret_cast<uint32_t*>(buffer.data()),
-                                   buffer.size());
-      RandenPool<uint32_t>::Fill(target);
-    }
-
-    // The non-uint32_t case should be uncommon, and involves an extra copy,
-    // filling the uint32_t buffer and then mixing into the output.
-    template <typename RandomAccessIterator>
-    void generate_impl(std::integral_constant<bool, false>,
-                       RandomAccessIterator begin, RandomAccessIterator end) {
-      const size_t n = std::distance(begin, end);
-      absl::InlinedVector<uint32_t, 8> data(n, 0);
-      RandenPool<uint32_t>::Fill(absl::MakeSpan(data.begin(), data.end()));
-      std::copy(std::begin(data), std::end(data), begin);
-    }
-  };
-
-  static URBG ConstructURBG() {
-    Seeder seeder;
-    return URBG(seeder);
-  }
-
-  template <typename SSeq>
-  static URBG ConstructURBG(SSeq&& seq) {  // NOLINT(runtime/references)
-    auto salted_seq =
-        random_internal::MakeSaltedSeedSeq(std::forward<SSeq>(seq));
-    return URBG(salted_seq);
-  }
-
-  URBG urbg_;
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_NONSECURE_BASE_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/nonsecure_base_test.cc b/third_party/abseil_cpp/absl/random/internal/nonsecure_base_test.cc
deleted file mode 100644
index 698027fc6e0d..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/nonsecure_base_test.cc
+++ /dev/null
@@ -1,245 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/nonsecure_base.h"
-
-#include <algorithm>
-#include <iostream>
-#include <memory>
-#include <random>
-#include <sstream>
-
-#include "gtest/gtest.h"
-#include "absl/random/distributions.h"
-#include "absl/random/random.h"
-#include "absl/strings/str_cat.h"
-
-namespace {
-
-using ExampleNonsecureURBG =
-    absl::random_internal::NonsecureURBGBase<std::mt19937>;
-
-template <typename T>
-void Use(const T&) {}
-
-}  // namespace
-
-TEST(NonsecureURBGBase, DefaultConstructorIsValid) {
-  ExampleNonsecureURBG urbg;
-}
-
-// Ensure that the recommended template-instantiations are valid.
-TEST(RecommendedTemplates, CanBeConstructed) {
-  absl::BitGen default_generator;
-  absl::InsecureBitGen insecure_generator;
-}
-
-TEST(RecommendedTemplates, CanDiscardValues) {
-  absl::BitGen default_generator;
-  absl::InsecureBitGen insecure_generator;
-
-  default_generator.discard(5);
-  insecure_generator.discard(5);
-}
-
-TEST(NonsecureURBGBase, StandardInterface) {
-  // Names after definition of [rand.req.urbg] in C++ standard.
-  // e us a value of E
-  // v is a lvalue of E
-  // x, y are possibly const values of E
-  // s is a value of T
-  // q is a value satisfying requirements of seed_sequence
-  // z is a value of type unsigned long long
-  // os is a some specialization of basic_ostream
-  // is is a some specialization of basic_istream
-
-  using E = absl::random_internal::NonsecureURBGBase<std::minstd_rand>;
-
-  using T = typename E::result_type;
-
-  static_assert(!std::is_copy_constructible<E>::value,
-                "NonsecureURBGBase should not be copy constructible");
-
-  static_assert(!absl::is_copy_assignable<E>::value,
-                "NonsecureURBGBase should not be copy assignable");
-
-  static_assert(std::is_move_constructible<E>::value,
-                "NonsecureURBGBase should be move constructible");
-
-  static_assert(absl::is_move_assignable<E>::value,
-                "NonsecureURBGBase should be move assignable");
-
-  static_assert(std::is_same<decltype(std::declval<E>()()), T>::value,
-                "return type of operator() must be result_type");
-
-  {
-    const E x, y;
-    Use(x);
-    Use(y);
-
-    static_assert(std::is_same<decltype(x == y), bool>::value,
-                  "return type of operator== must be bool");
-
-    static_assert(std::is_same<decltype(x != y), bool>::value,
-                  "return type of operator== must be bool");
-  }
-
-  E e;
-  std::seed_seq q{1, 2, 3};
-
-  E{};
-  E{q};
-
-  // Copy constructor not supported.
-  // E{x};
-
-  // result_type seed constructor not supported.
-  // E{T{1}};
-
-  // Move constructors are supported.
-  {
-    E tmp(q);
-    E m = std::move(tmp);
-    E n(std::move(m));
-    EXPECT_TRUE(e != n);
-  }
-
-  // Comparisons work.
-  {
-    // MSVC emits error 2718 when using EXPECT_EQ(e, x)
-    //  * actual parameter with __declspec(align('#')) won't be aligned
-    E a(q);
-    E b(q);
-
-    EXPECT_TRUE(a != e);
-    EXPECT_TRUE(a == b);
-
-    a();
-    EXPECT_TRUE(a != b);
-  }
-
-  // e.seed(s) not supported.
-
-  // [rand.req.eng] specifies the parameter as 'unsigned long long'
-  // e.discard(unsigned long long) is supported.
-  unsigned long long z = 1;  // NOLINT(runtime/int)
-  e.discard(z);
-}
-
-TEST(NonsecureURBGBase, SeedSeqConstructorIsValid) {
-  std::seed_seq seq;
-  ExampleNonsecureURBG rbg(seq);
-}
-
-TEST(NonsecureURBGBase, CompatibleWithDistributionUtils) {
-  ExampleNonsecureURBG rbg;
-
-  absl::Uniform(rbg, 0, 100);
-  absl::Uniform(rbg, 0.5, 0.7);
-  absl::Poisson<uint32_t>(rbg);
-  absl::Exponential<float>(rbg);
-}
-
-TEST(NonsecureURBGBase, CompatibleWithStdDistributions) {
-  ExampleNonsecureURBG rbg;
-
-  // Cast to void to suppress [[nodiscard]] warnings
-  static_cast<void>(std::uniform_int_distribution<uint32_t>(0, 100)(rbg));
-  static_cast<void>(std::uniform_real_distribution<float>()(rbg));
-  static_cast<void>(std::bernoulli_distribution(0.2)(rbg));
-}
-
-TEST(NonsecureURBGBase, ConsecutiveDefaultInstancesYieldUniqueVariates) {
-  const size_t kNumSamples = 128;
-
-  ExampleNonsecureURBG rbg1;
-  ExampleNonsecureURBG rbg2;
-
-  for (size_t i = 0; i < kNumSamples; i++) {
-    EXPECT_NE(rbg1(), rbg2());
-  }
-}
-
-TEST(NonsecureURBGBase, EqualSeedSequencesYieldEqualVariates) {
-  std::seed_seq seq;
-
-  ExampleNonsecureURBG rbg1(seq);
-  ExampleNonsecureURBG rbg2(seq);
-
-  // ExampleNonsecureURBG rbg3({1, 2, 3});  // Should not compile.
-
-  for (uint32_t i = 0; i < 1000; i++) {
-    EXPECT_EQ(rbg1(), rbg2());
-  }
-
-  rbg1.discard(100);
-  rbg2.discard(100);
-
-  // The sequences should continue after discarding
-  for (uint32_t i = 0; i < 1000; i++) {
-    EXPECT_EQ(rbg1(), rbg2());
-  }
-}
-
-// This is a PRNG-compatible type specifically designed to test
-// that NonsecureURBGBase::Seeder can correctly handle iterators
-// to arbitrary non-uint32_t size types.
-template <typename T>
-struct SeederTestEngine {
-  using result_type = T;
-
-  static constexpr result_type(min)() {
-    return (std::numeric_limits<result_type>::min)();
-  }
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  template <class SeedSequence,
-            typename = typename absl::enable_if_t<
-                !std::is_same<SeedSequence, SeederTestEngine>::value>>
-  explicit SeederTestEngine(SeedSequence&& seq) {
-    seed(seq);
-  }
-
-  SeederTestEngine(const SeederTestEngine&) = default;
-  SeederTestEngine& operator=(const SeederTestEngine&) = default;
-  SeederTestEngine(SeederTestEngine&&) = default;
-  SeederTestEngine& operator=(SeederTestEngine&&) = default;
-
-  result_type operator()() { return state[0]; }
-
-  template <class SeedSequence>
-  void seed(SeedSequence&& seq) {
-    std::fill(std::begin(state), std::end(state), T(0));
-    seq.generate(std::begin(state), std::end(state));
-  }
-
-  T state[2];
-};
-
-TEST(NonsecureURBGBase, SeederWorksForU32) {
-  using U32 =
-      absl::random_internal::NonsecureURBGBase<SeederTestEngine<uint32_t>>;
-  U32 x;
-  EXPECT_NE(0, x());
-}
-
-TEST(NonsecureURBGBase, SeederWorksForU64) {
-  using U64 =
-      absl::random_internal::NonsecureURBGBase<SeederTestEngine<uint64_t>>;
-
-  U64 x;
-  EXPECT_NE(0, x());
-}
diff --git a/third_party/abseil_cpp/absl/random/internal/pcg_engine.h b/third_party/abseil_cpp/absl/random/internal/pcg_engine.h
deleted file mode 100644
index 53c23fe1b492..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/pcg_engine.h
+++ /dev/null
@@ -1,307 +0,0 @@
-// Copyright 2018 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_PCG_ENGINE_H_
-#define ABSL_RANDOM_INTERNAL_PCG_ENGINE_H_
-
-#include <type_traits>
-
-#include "absl/base/config.h"
-#include "absl/meta/type_traits.h"
-#include "absl/numeric/int128.h"
-#include "absl/random/internal/fastmath.h"
-#include "absl/random/internal/iostream_state_saver.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// pcg_engine is a simplified implementation of Melissa O'Neil's PCG engine in
-// C++.  PCG combines a linear congruential generator (LCG) with output state
-// mixing functions to generate each random variate.  pcg_engine supports only a
-// single sequence (oneseq), and does not support streams.
-//
-// pcg_engine is parameterized by two types:
-//   Params, which provides the multiplier and increment values;
-//   Mix, which mixes the state into the result.
-//
-template <typename Params, typename Mix>
-class pcg_engine {
-  static_assert(std::is_same<typename Params::state_type,
-                             typename Mix::state_type>::value,
-                "Class-template absl::pcg_engine must be parameterized by "
-                "Params and Mix with identical state_type");
-
-  static_assert(std::is_unsigned<typename Mix::result_type>::value,
-                "Class-template absl::pcg_engine must be parameterized by "
-                "an unsigned Mix::result_type");
-
-  using params_type = Params;
-  using mix_type = Mix;
-  using state_type = typename Mix::state_type;
-
- public:
-  // C++11 URBG interface:
-  using result_type = typename Mix::result_type;
-
-  static constexpr result_type(min)() {
-    return (std::numeric_limits<result_type>::min)();
-  }
-
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  explicit pcg_engine(uint64_t seed_value = 0) { seed(seed_value); }
-
-  template <class SeedSequence,
-            typename = typename absl::enable_if_t<
-                !std::is_same<SeedSequence, pcg_engine>::value>>
-  explicit pcg_engine(SeedSequence&& seq) {
-    seed(seq);
-  }
-
-  pcg_engine(const pcg_engine&) = default;
-  pcg_engine& operator=(const pcg_engine&) = default;
-  pcg_engine(pcg_engine&&) = default;
-  pcg_engine& operator=(pcg_engine&&) = default;
-
-  result_type operator()() {
-    // Advance the LCG state, always using the new value to generate the output.
-    state_ = lcg(state_);
-    return Mix{}(state_);
-  }
-
-  void seed(uint64_t seed_value = 0) {
-    state_type tmp = seed_value;
-    state_ = lcg(tmp + Params::increment());
-  }
-
-  template <class SeedSequence>
-  typename absl::enable_if_t<
-      !std::is_convertible<SeedSequence, uint64_t>::value, void>
-  seed(SeedSequence&& seq) {
-    reseed(seq);
-  }
-
-  void discard(uint64_t count) { state_ = advance(state_, count); }
-
-  bool operator==(const pcg_engine& other) const {
-    return state_ == other.state_;
-  }
-
-  bool operator!=(const pcg_engine& other) const { return !(*this == other); }
-
-  template <class CharT, class Traits>
-  friend typename absl::enable_if_t<(sizeof(state_type) == 16),
-                                    std::basic_ostream<CharT, Traits>&>
-  operator<<(
-      std::basic_ostream<CharT, Traits>& os,  // NOLINT(runtime/references)
-      const pcg_engine& engine) {
-    auto saver = random_internal::make_ostream_state_saver(os);
-    random_internal::stream_u128_helper<state_type> helper;
-    helper.write(pcg_engine::params_type::multiplier(), os);
-    os << os.fill();
-    helper.write(pcg_engine::params_type::increment(), os);
-    os << os.fill();
-    helper.write(engine.state_, os);
-    return os;
-  }
-
-  template <class CharT, class Traits>
-  friend typename absl::enable_if_t<(sizeof(state_type) <= 8),
-                                    std::basic_ostream<CharT, Traits>&>
-  operator<<(
-      std::basic_ostream<CharT, Traits>& os,  // NOLINT(runtime/references)
-      const pcg_engine& engine) {
-    auto saver = random_internal::make_ostream_state_saver(os);
-    os << pcg_engine::params_type::multiplier() << os.fill();
-    os << pcg_engine::params_type::increment() << os.fill();
-    os << engine.state_;
-    return os;
-  }
-
-  template <class CharT, class Traits>
-  friend typename absl::enable_if_t<(sizeof(state_type) == 16),
-                                    std::basic_istream<CharT, Traits>&>
-  operator>>(
-      std::basic_istream<CharT, Traits>& is,  // NOLINT(runtime/references)
-      pcg_engine& engine) {                   // NOLINT(runtime/references)
-    random_internal::stream_u128_helper<state_type> helper;
-    auto mult = helper.read(is);
-    auto inc = helper.read(is);
-    auto tmp = helper.read(is);
-    if (mult != pcg_engine::params_type::multiplier() ||
-        inc != pcg_engine::params_type::increment()) {
-      // signal failure by setting the failbit.
-      is.setstate(is.rdstate() | std::ios_base::failbit);
-    }
-    if (!is.fail()) {
-      engine.state_ = tmp;
-    }
-    return is;
-  }
-
-  template <class CharT, class Traits>
-  friend typename absl::enable_if_t<(sizeof(state_type) <= 8),
-                                    std::basic_istream<CharT, Traits>&>
-  operator>>(
-      std::basic_istream<CharT, Traits>& is,  // NOLINT(runtime/references)
-      pcg_engine& engine) {                   // NOLINT(runtime/references)
-    state_type mult{}, inc{}, tmp{};
-    is >> mult >> inc >> tmp;
-    if (mult != pcg_engine::params_type::multiplier() ||
-        inc != pcg_engine::params_type::increment()) {
-      // signal failure by setting the failbit.
-      is.setstate(is.rdstate() | std::ios_base::failbit);
-    }
-    if (!is.fail()) {
-      engine.state_ = tmp;
-    }
-    return is;
-  }
-
- private:
-  state_type state_;
-
-  // Returns the linear-congruential generator next state.
-  static inline constexpr state_type lcg(state_type s) {
-    return s * Params::multiplier() + Params::increment();
-  }
-
-  // Returns the linear-congruential arbitrary seek state.
-  inline state_type advance(state_type s, uint64_t n) const {
-    state_type mult = Params::multiplier();
-    state_type inc = Params::increment();
-    state_type m = 1;
-    state_type i = 0;
-    while (n > 0) {
-      if (n & 1) {
-        m *= mult;
-        i = i * mult + inc;
-      }
-      inc = (mult + 1) * inc;
-      mult *= mult;
-      n >>= 1;
-    }
-    return m * s + i;
-  }
-
-  template <class SeedSequence>
-  void reseed(SeedSequence& seq) {
-    using sequence_result_type = typename SeedSequence::result_type;
-    constexpr size_t kBufferSize =
-        sizeof(state_type) / sizeof(sequence_result_type);
-    sequence_result_type buffer[kBufferSize];
-    seq.generate(std::begin(buffer), std::end(buffer));
-    // Convert the seed output to a single state value.
-    state_type tmp = buffer[0];
-    for (size_t i = 1; i < kBufferSize; i++) {
-      tmp <<= (sizeof(sequence_result_type) * 8);
-      tmp |= buffer[i];
-    }
-    state_ = lcg(tmp + params_type::increment());
-  }
-};
-
-// Parameterized implementation of the PCG 128-bit oneseq state.
-// This provides state_type, multiplier, and increment for pcg_engine.
-template <uint64_t kMultA, uint64_t kMultB, uint64_t kIncA, uint64_t kIncB>
-class pcg128_params {
- public:
-#if ABSL_HAVE_INTRINSIC_INT128
-  using state_type = __uint128_t;
-  static inline constexpr state_type make_u128(uint64_t a, uint64_t b) {
-    return (static_cast<__uint128_t>(a) << 64) | b;
-  }
-#else
-  using state_type = absl::uint128;
-  static inline constexpr state_type make_u128(uint64_t a, uint64_t b) {
-    return absl::MakeUint128(a, b);
-  }
-#endif
-
-  static inline constexpr state_type multiplier() {
-    return make_u128(kMultA, kMultB);
-  }
-  static inline constexpr state_type increment() {
-    return make_u128(kIncA, kIncB);
-  }
-};
-
-// Implementation of the PCG xsl_rr_128_64 128-bit mixing function, which
-// accepts an input of state_type and mixes it into an output of result_type.
-struct pcg_xsl_rr_128_64 {
-#if ABSL_HAVE_INTRINSIC_INT128
-  using state_type = __uint128_t;
-#else
-  using state_type = absl::uint128;
-#endif
-  using result_type = uint64_t;
-
-  inline uint64_t operator()(state_type state) {
-    // This is equivalent to the xsl_rr_128_64 mixing function.
-#if ABSL_HAVE_INTRINSIC_INT128
-    uint64_t rotate = static_cast<uint64_t>(state >> 122u);
-    state ^= state >> 64;
-    uint64_t s = static_cast<uint64_t>(state);
-#else
-    uint64_t h = Uint128High64(state);
-    uint64_t rotate = h >> 58u;
-    uint64_t s = Uint128Low64(state) ^ h;
-#endif
-    return random_internal::rotr(s, rotate);
-  }
-};
-
-// Parameterized implementation of the PCG 64-bit oneseq state.
-// This provides state_type, multiplier, and increment for pcg_engine.
-template <uint64_t kMult, uint64_t kInc>
-class pcg64_params {
- public:
-  using state_type = uint64_t;
-  static inline constexpr state_type multiplier() { return kMult; }
-  static inline constexpr state_type increment() { return kInc; }
-};
-
-// Implementation of the PCG xsh_rr_64_32 64-bit mixing function, which accepts
-// an input of state_type and mixes it into an output of result_type.
-struct pcg_xsh_rr_64_32 {
-  using state_type = uint64_t;
-  using result_type = uint32_t;
-  inline uint32_t operator()(uint64_t state) {
-    return random_internal::rotr(
-        static_cast<uint32_t>(((state >> 18) ^ state) >> 27), state >> 59);
-  }
-};
-
-// Stable pcg_engine implementations:
-// This is a 64-bit generator using 128-bits of state.
-// The output sequence is equivalent to Melissa O'Neil's pcg64_oneseq.
-using pcg64_2018_engine = pcg_engine<
-    random_internal::pcg128_params<0x2360ed051fc65da4ull, 0x4385df649fccf645ull,
-                                   0x5851f42d4c957f2d, 0x14057b7ef767814f>,
-    random_internal::pcg_xsl_rr_128_64>;
-
-// This is a 32-bit generator using 64-bits of state.
-// This is equivalent to Melissa O'Neil's pcg32_oneseq.
-using pcg32_2018_engine = pcg_engine<
-    random_internal::pcg64_params<0x5851f42d4c957f2dull, 0x14057b7ef767814full>,
-    random_internal::pcg_xsh_rr_64_32>;
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_PCG_ENGINE_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/pcg_engine_test.cc b/third_party/abseil_cpp/absl/random/internal/pcg_engine_test.cc
deleted file mode 100644
index 4d763e89eb58..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/pcg_engine_test.cc
+++ /dev/null
@@ -1,638 +0,0 @@
-// Copyright 2018 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/pcg_engine.h"
-
-#include <algorithm>
-#include <bitset>
-#include <random>
-#include <sstream>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/random/internal/explicit_seed_seq.h"
-#include "absl/time/clock.h"
-
-#define UPDATE_GOLDEN 0
-
-namespace {
-
-using absl::random_internal::ExplicitSeedSeq;
-using absl::random_internal::pcg32_2018_engine;
-using absl::random_internal::pcg64_2018_engine;
-
-template <typename EngineType>
-class PCGEngineTest : public ::testing::Test {};
-
-using EngineTypes = ::testing::Types<pcg64_2018_engine, pcg32_2018_engine>;
-
-TYPED_TEST_SUITE(PCGEngineTest, EngineTypes);
-
-TYPED_TEST(PCGEngineTest, VerifyReseedChangesAllValues) {
-  using engine_type = TypeParam;
-  using result_type = typename engine_type::result_type;
-
-  const size_t kNumOutputs = 16;
-  engine_type engine;
-
-  // MSVC emits error 2719 without the use of std::ref below.
-  //  * formal parameter with __declspec(align('#')) won't be aligned
-
-  {
-    std::seed_seq seq1{1, 2, 3, 4, 5, 6, 7};
-    engine.seed(seq1);
-  }
-  result_type a[kNumOutputs];
-  std::generate(std::begin(a), std::end(a), std::ref(engine));
-
-  {
-    std::random_device rd;
-    std::seed_seq seq2{rd(), rd(), rd()};
-    engine.seed(seq2);
-  }
-  result_type b[kNumOutputs];
-  std::generate(std::begin(b), std::end(b), std::ref(engine));
-
-  // Verify that two uncorrelated values have ~50% of there bits in common. Use
-  // a 10% margin-of-error to reduce flakiness.
-  size_t changed_bits = 0;
-  size_t unchanged_bits = 0;
-  size_t total_set = 0;
-  size_t total_bits = 0;
-  size_t equal_count = 0;
-  for (size_t i = 0; i < kNumOutputs; ++i) {
-    equal_count += (a[i] == b[i]) ? 1 : 0;
-    std::bitset<sizeof(result_type) * 8> bitset(a[i] ^ b[i]);
-    changed_bits += bitset.count();
-    unchanged_bits += bitset.size() - bitset.count();
-
-    std::bitset<sizeof(result_type) * 8> a_set(a[i]);
-    std::bitset<sizeof(result_type) * 8> b_set(b[i]);
-    total_set += a_set.count() + b_set.count();
-    total_bits += 2 * 8 * sizeof(result_type);
-  }
-  // On average, half the bits are changed between two calls.
-  EXPECT_LE(changed_bits, 0.60 * (changed_bits + unchanged_bits));
-  EXPECT_GE(changed_bits, 0.40 * (changed_bits + unchanged_bits));
-
-  // verify using a quick normal-approximation to the binomial.
-  EXPECT_NEAR(total_set, total_bits * 0.5, 4 * std::sqrt(total_bits))
-      << "@" << total_set / static_cast<double>(total_bits);
-
-  // Also, A[i] == B[i] with probability (1/range) * N.
-  // Give this a pretty wide latitude, though.
-  const double kExpected = kNumOutputs / (1.0 * sizeof(result_type) * 8);
-  EXPECT_LE(equal_count, 1.0 + kExpected);
-}
-
-// Number of values that needs to be consumed to clean two sizes of buffer
-// and trigger third refresh. (slightly overestimates the actual state size).
-constexpr size_t kTwoBufferValues = 16;
-
-TYPED_TEST(PCGEngineTest, VerifyDiscard) {
-  using engine_type = TypeParam;
-
-  for (size_t num_used = 0; num_used < kTwoBufferValues; ++num_used) {
-    engine_type engine_used;
-    for (size_t i = 0; i < num_used; ++i) {
-      engine_used();
-    }
-
-    for (size_t num_discard = 0; num_discard < kTwoBufferValues;
-         ++num_discard) {
-      engine_type engine1 = engine_used;
-      engine_type engine2 = engine_used;
-      for (size_t i = 0; i < num_discard; ++i) {
-        engine1();
-      }
-      engine2.discard(num_discard);
-      for (size_t i = 0; i < kTwoBufferValues; ++i) {
-        const auto r1 = engine1();
-        const auto r2 = engine2();
-        ASSERT_EQ(r1, r2) << "used=" << num_used << " discard=" << num_discard;
-      }
-    }
-  }
-}
-
-TYPED_TEST(PCGEngineTest, StreamOperatorsResult) {
-  using engine_type = TypeParam;
-
-  std::wostringstream os;
-  std::wistringstream is;
-  engine_type engine;
-
-  EXPECT_EQ(&(os << engine), &os);
-  EXPECT_EQ(&(is >> engine), &is);
-}
-
-TYPED_TEST(PCGEngineTest, StreamSerialization) {
-  using engine_type = TypeParam;
-
-  for (size_t discard = 0; discard < kTwoBufferValues; ++discard) {
-    ExplicitSeedSeq seed_sequence{12, 34, 56};
-    engine_type engine(seed_sequence);
-    engine.discard(discard);
-
-    std::stringstream stream;
-    stream << engine;
-
-    engine_type new_engine;
-    stream >> new_engine;
-    for (size_t i = 0; i < 64; ++i) {
-      EXPECT_EQ(engine(), new_engine()) << " " << i;
-    }
-  }
-}
-
-constexpr size_t kNumGoldenOutputs = 127;
-
-// This test is checking if randen_engine is meets interface requirements
-// defined in [rand.req.urbg].
-TYPED_TEST(PCGEngineTest, RandomNumberEngineInterface) {
-  using engine_type = TypeParam;
-
-  using E = engine_type;
-  using T = typename E::result_type;
-
-  static_assert(std::is_copy_constructible<E>::value,
-                "engine_type must be copy constructible");
-
-  static_assert(absl::is_copy_assignable<E>::value,
-                "engine_type must be copy assignable");
-
-  static_assert(std::is_move_constructible<E>::value,
-                "engine_type must be move constructible");
-
-  static_assert(absl::is_move_assignable<E>::value,
-                "engine_type must be move assignable");
-
-  static_assert(std::is_same<decltype(std::declval<E>()()), T>::value,
-                "return type of operator() must be result_type");
-
-  // Names after definition of [rand.req.urbg] in C++ standard.
-  // e us a value of E
-  // v is a lvalue of E
-  // x, y are possibly const values of E
-  // s is a value of T
-  // q is a value satisfying requirements of seed_sequence
-  // z is a value of type unsigned long long
-  // os is a some specialization of basic_ostream
-  // is is a some specialization of basic_istream
-
-  E e, v;
-  const E x, y;
-  T s = 1;
-  std::seed_seq q{1, 2, 3};
-  unsigned long long z = 1;  // NOLINT(runtime/int)
-  std::wostringstream os;
-  std::wistringstream is;
-
-  E{};
-  E{x};
-  E{s};
-  E{q};
-
-  e.seed();
-
-  // MSVC emits error 2718 when using EXPECT_EQ(e, x)
-  //  * actual parameter with __declspec(align('#')) won't be aligned
-  EXPECT_TRUE(e == x);
-
-  e.seed(q);
-  {
-    E tmp(q);
-    EXPECT_TRUE(e == tmp);
-  }
-
-  e();
-  {
-    E tmp(q);
-    EXPECT_TRUE(e != tmp);
-  }
-
-  e.discard(z);
-
-  static_assert(std::is_same<decltype(x == y), bool>::value,
-                "return type of operator== must be bool");
-
-  static_assert(std::is_same<decltype(x != y), bool>::value,
-                "return type of operator== must be bool");
-}
-
-TYPED_TEST(PCGEngineTest, RandenEngineSFINAETest) {
-  using engine_type = TypeParam;
-  using result_type = typename engine_type::result_type;
-
-  {
-    engine_type engine(result_type(1));
-    engine.seed(result_type(1));
-  }
-
-  {
-    result_type n = 1;
-    engine_type engine(n);
-    engine.seed(n);
-  }
-
-  {
-    engine_type engine(1);
-    engine.seed(1);
-  }
-
-  {
-    int n = 1;
-    engine_type engine(n);
-    engine.seed(n);
-  }
-
-  {
-    std::seed_seq seed_seq;
-    engine_type engine(seed_seq);
-    engine.seed(seed_seq);
-  }
-
-  {
-    engine_type engine{std::seed_seq()};
-    engine.seed(std::seed_seq());
-  }
-}
-
-// ------------------------------------------------------------------
-// Stability tests for pcg64_2018_engine
-// ------------------------------------------------------------------
-TEST(PCG642018EngineTest, VerifyGolden) {
-  constexpr uint64_t kGolden[kNumGoldenOutputs] = {
-      0x01070196e695f8f1, 0x703ec840c59f4493, 0xe54954914b3a44fa,
-      0x96130ff204b9285e, 0x7d9fdef535ceb21a, 0x666feed42e1219a0,
-      0x981f685721c8326f, 0xad80710d6eab4dda, 0xe202c480b037a029,
-      0x5d3390eaedd907e2, 0x0756befb39c6b8aa, 0x1fb44ba6634d62a3,
-      0x8d20423662426642, 0x34ea910167a39fb4, 0x93010b43a80d0ab6,
-      0x663db08a98fc568a, 0x720b0a1335956fae, 0x2c35483e31e1d3ba,
-      0x429f39776337409d, 0xb46d99e638687344, 0x105370b96aedcaee,
-      0x3999e92f811cff71, 0xd230f8bcb591cfc9, 0x0dce3db2ba7bdea5,
-      0xcf2f52c91eec99af, 0x2bc7c24a8b998a39, 0xbd8af1b0d599a19c,
-      0x56bc45abc66059f5, 0x170a46dc170f7f1e, 0xc25daf5277b85fad,
-      0xe629c2e0c948eadb, 0x1720a796915542ed, 0x22fb0caa4f909951,
-      0x7e0c0f4175acd83d, 0xd9fcab37ff2a860c, 0xab2280fb2054bad1,
-      0x58e8a06f37fa9e99, 0xc3a52a30b06528c7, 0x0175f773a13fc1bd,
-      0x731cfc584b00e840, 0x404cc7b2648069cb, 0x5bc29153b0b7f783,
-      0x771310a38cc999d1, 0x766a572f0a71a916, 0x90f450fb4fc48348,
-      0xf080ea3e1c7b1a0d, 0x15471a4507d66a44, 0x7d58e55a78f3df69,
-      0x0130a094576ac99c, 0x46669cb2d04b1d87, 0x17ab5bed20191840,
-      0x95b177d260adff3e, 0x025fb624b6ee4c07, 0xb35de4330154a95f,
-      0xe8510fff67e24c79, 0x132c3cbcd76ed2d3, 0x35e7cc145a093904,
-      0x9f5b5b5f81583b79, 0x3ee749a533966233, 0x4af85886cdeda8cd,
-      0x0ca5380ecb3ef3aa, 0x4f674eb7661d3192, 0x88a29aad00cd7733,
-      0x70b627ca045ffac6, 0x5912b43ea887623d, 0x95dc9fc6f62cf221,
-      0x926081a12a5c905b, 0x9c57d4cd7dfce651, 0x85ab2cbf23e3bb5d,
-      0xc5cd669f63023152, 0x3067be0fad5d898e, 0x12b56f444cb53d05,
-      0xbc2e5a640c3434fc, 0x9280bff0e4613fe1, 0x98819094c528743e,
-      0x999d1c98d829df33, 0x9ff82a012dc89242, 0xf99183ed39c8be94,
-      0xf0f59161cd421c55, 0x3c705730c2f6c48d, 0x66ad85c6e9278a61,
-      0x2a3428e4a428d5d0, 0x79207d68fd04940d, 0xea7f2b402edc8430,
-      0xa06b419ac857f63b, 0xcb1dd0e6fbc47e1c, 0x4f55229200ada6a4,
-      0x9647b5e6359c927f, 0x30bf8f9197c7efe5, 0xa79519529cc384d0,
-      0xbb22c4f339ad6497, 0xd7b9782f59d14175, 0x0dff12fff2ec0118,
-      0xa331ad8305343a7c, 0x48dad7e3f17e0862, 0x324c6fb3fd3c9665,
-      0xf0e4350e7933dfc4, 0x7ccda2f30b8b03b6, 0xa0afc6179005de40,
-      0xee65da6d063b3a30, 0xb9506f42f2bfe87a, 0xc9a2e26b0ef5baa0,
-      0x39fa9d4f495011d6, 0xbecc21a45d023948, 0x6bf484c6593f737f,
-      0x8065e0070cadc3b7, 0x9ef617ed8d419799, 0xac692cf8c233dd15,
-      0xd2ed87583c4ebb98, 0xad95ba1bebfedc62, 0x9b60b160a8264e43,
-      0x0bc8c45f71fcf25b, 0x4a78035cdf1c9931, 0x4602dc106667e029,
-      0xb335a3c250498ac8, 0x0256ebc4df20cab8, 0x0c61efd153f0c8d9,
-      0xe5d0150a4f806f88, 0x99d6521d351e7d87, 0x8d4888c9f80f4325,
-      0x106c5735c1ba868d, 0x73414881b880a878, 0x808a9a58a3064751,
-      0x339a29f3746de3d5, 0x5410d7fa4f873896, 0xd84623c81d7b8a03,
-      0x1f7c7e7a7f47f462,
-  };
-
-  pcg64_2018_engine engine(0);
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%016lx, ", engine());
-    if (i % 3 == 2) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed();
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(PCG642018EngineTest, VerifyGoldenSeeded) {
-  constexpr uint64_t kGolden[kNumGoldenOutputs] = {
-      0xb03988f1e39691ee, 0xbd2a1eb5ac31e97a, 0x8f00d6d433634d02,
-      0x1823c28d483d5776, 0x000c3ee3e1aeb74a, 0xfa82ef27a4f3df9c,
-      0xc6f382308654e454, 0x414afb1a238996c2, 0x4703a4bc252eb411,
-      0x99d64f62c8f7f654, 0xbb07ebe11a34fa44, 0x79eb06a363c06131,
-      0xf66ad3756f1c6b21, 0x130c01d5e869f457, 0x5ca2b9963aecbc81,
-      0xfef7bebc1de27e6c, 0x1d174faa5ed2cdbf, 0xd75b7a773f2bb889,
-      0xc35c872327a170a5, 0x46da6d88646a42fe, 0x4622985e0442dae2,
-      0xbe3cbd67297f1f9b, 0xe7c37b4a4798bfd1, 0x173d5dfad15a25c3,
-      0x0eb6849ba2961522, 0xb0ff7246e6700d73, 0x88cb9c42d3afa577,
-      0xb609731dbd94d917, 0xd3941cda04b40081, 0x28d140f7409bea3a,
-      0x3c96699a920a124a, 0xdb28be521958b2fd, 0x0a3f44db3d4c5124,
-      0x7ac8e60ba13b70d2, 0x75f03a41ded5195a, 0xaed10ac7c4e4825d,
-      0xb92a3b18aadb7adc, 0xda45e0081f2bca46, 0x74d39ab3753143fc,
-      0xb686038018fac9ca, 0x4cc309fe99542dbb, 0xf3e1a4fcb311097c,
-      0x58763d6fa698d69d, 0xd11c365dbecd8d60, 0x2c15d55725b1dee7,
-      0x89805f254d85658c, 0x2374c44dfc62158b, 0x9a8350fa7995328d,
-      0x198f838970cf91da, 0x96aff569562c0e53, 0xd76c8c52b7ec6e3f,
-      0x23a01cd9ae4baa81, 0x3adb366b6d02a893, 0xb3313e2a4c5b333f,
-      0x04c11230b96a5425, 0x1f7f7af04787d571, 0xaddb019365275ec7,
-      0x5c960468ccb09f42, 0x8438db698c69a44a, 0x492be1e46111637e,
-      0x9c6c01e18100c610, 0xbfe48e75b7d0aceb, 0xb5e0b89ec1ce6a00,
-      0x9d280ecbc2fe8997, 0x290d9e991ba5fcab, 0xeec5bec7d9d2a4f0,
-      0x726e81488f19150e, 0x1a6df7955a7e462c, 0x37a12d174ba46bb5,
-      0x3cdcdffd96b1b5c5, 0x2c5d5ac10661a26e, 0xa742ed18f22e50c4,
-      0x00e0ed88ff0d8a35, 0x3d3c1718cb1efc0b, 0x1d70c51ffbccbf11,
-      0xfbbb895132a4092f, 0x619d27f2fb095f24, 0x69af68200985e5c4,
-      0xbee4885f57373f8d, 0x10b7a6bfe0587e40, 0xa885e6cf2f7e5f0a,
-      0x59f879464f767550, 0x24e805d69056990d, 0x860970b911095891,
-      0xca3189954f84170d, 0x6652a5edd4590134, 0x5e1008cef76174bf,
-      0xcbd417881f2bcfe5, 0xfd49fc9d706ecd17, 0xeebf540221ebd066,
-      0x46af7679464504cb, 0xd4028486946956f1, 0xd4f41864b86c2103,
-      0x7af090e751583372, 0x98cdaa09278cb642, 0xffd42b921215602f,
-      0x1d05bec8466b1740, 0xf036fa78a0132044, 0x787880589d1ecc78,
-      0x5644552cfef33230, 0x0a97e275fe06884b, 0x96d1b13333d470b5,
-      0xc8b3cdad52d3b034, 0x091357b9db7376fd, 0xa5fe4232555edf8c,
-      0x3371bc3b6ada76b5, 0x7deeb2300477c995, 0x6fc6d4244f2849c1,
-      0x750e8cc797ca340a, 0x81728613cd79899f, 0x3467f4ee6f9aeb93,
-      0x5ef0a905f58c640f, 0x432db85e5101c98a, 0x6488e96f46ac80c2,
-      0x22fddb282625048c, 0x15b287a0bc2d4c5d, 0xa7e2343ef1f28bce,
-      0xc87ee1aa89bed09e, 0x220610107812c5e9, 0xcbdab6fcd640f586,
-      0x8d41047970928784, 0x1aa431509ec1ade0, 0xac3f0be53f518ddc,
-      0x16f4428ad81d0cbb, 0x675b13c2736fc4bb, 0x6db073afdd87e32d,
-      0x572f3ca2f1a078c6,
-  };
-
-  ExplicitSeedSeq seed_sequence{12, 34, 56};
-  pcg64_2018_engine engine(seed_sequence);
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%016lx, ", engine());
-    if (i % 3 == 2) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed(seed_sequence);
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(PCG642018EngineTest, VerifyGoldenFromDeserializedEngine) {
-  constexpr uint64_t kGolden[kNumGoldenOutputs] = {
-      0xdd425b47b4113dea, 0x1b07176479d444b0, 0x6b391027586f2e42,
-      0xa166f2b15f4a2143, 0xffb6dbd7a179ee97, 0xb2c00035365bf0b1,
-      0x8fbb518b45855521, 0xfc789a55ddf87c3b, 0x429531f0f17ff355,
-      0xbe708560d603d283, 0x5bff415175c5cb6b, 0xe813491f4ad45394,
-      0xa853f4506d55880d, 0x7e538453e568172e, 0xe101f1e098ddd0ec,
-      0x6ee31266ee4c766d, 0xa8786d92d66b39d7, 0xfee622a2acf5e5b0,
-      0x5fe8e82c102fa7b3, 0x01f10be4cdb53c9d, 0xbe0545366f857022,
-      0x12e74f010a339bca, 0xb10d85ca40d5ce34, 0xe80d6feba5054875,
-      0x2b7c1ee6d567d4ee, 0x2a9cd043bfd03b66, 0x5cfc531bd239f3f1,
-      0x1c4734e4647d70f5, 0x85a8f60f006b5760, 0x6a4239ce76dca387,
-      0x8da0f86d7339335c, 0xf055b0468551374d, 0x486e8567e9bea9a0,
-      0x4cb531b8405192dd, 0xf813b1ee3157110b, 0x214c2a664a875d8e,
-      0x74531237b29b35f7, 0xa6f0267bb77a771e, 0x64b552bff54184a4,
-      0xa2d6f7af2d75b6fc, 0x460a10018e03b5ab, 0x76fd1fdcb81d0800,
-      0x76f5f81805070d9d, 0x1fb75cb1a70b289a, 0x9dfd25a022c4b27f,
-      0x9a31a14a80528e9e, 0x910dc565ddc25820, 0xd6aef8e2b0936c10,
-      0xe1773c507fe70225, 0xe027fd7aadd632bc, 0xc1fecb427089c8b8,
-      0xb5c74c69fa9dbf26, 0x71bf9b0e4670227d, 0x25f48fad205dcfdd,
-      0x905248ec4d689c56, 0x5c2b7631b0de5c9d, 0x9f2ee0f8f485036c,
-      0xfd6ce4ebb90bf7ea, 0xd435d20046085574, 0x6b7eadcb0625f986,
-      0x679d7d44b48be89e, 0x49683b8e1cdc49de, 0x4366cf76e9a2f4ca,
-      0x54026ec1cdad7bed, 0xa9a04385207f28d3, 0xc8e66de4eba074b2,
-      0x40b08c42de0f4cc0, 0x1d4c5e0e93c5bbc0, 0x19b80792e470ae2d,
-      0x6fcaaeaa4c2a5bd9, 0xa92cb07c4238438e, 0x8bb5c918a007e298,
-      0x7cd671e944874cf4, 0x88166470b1ba3cac, 0xd013d476eaeeade6,
-      0xcee416947189b3c3, 0x5d7c16ab0dce6088, 0xd3578a5c32b13d27,
-      0x3875db5adc9cc973, 0xfbdaba01c5b5dc56, 0xffc4fdd391b231c3,
-      0x2334520ecb164fec, 0x361c115e7b6de1fa, 0xeee58106cc3563d7,
-      0x8b7f35a8db25ebb8, 0xb29d00211e2cafa6, 0x22a39fe4614b646b,
-      0x92ca6de8b998506d, 0x40922fe3d388d1db, 0x9da47f1e540f802a,
-      0x811dceebf16a25db, 0xf6524ae22e0e53a9, 0x52d9e780a16eb99d,
-      0x4f504286bb830207, 0xf6654d4786bd5cc3, 0x00bd98316003a7e1,
-      0xefda054a6ab8f5f3, 0x46cfb0f4c1872827, 0xc22b316965c0f3b2,
-      0xd1a28087c7e7562a, 0xaa4f6a094b7f5cff, 0xfe2bc853a041f7da,
-      0xe9d531402a83c3ba, 0xe545d8663d3ce4dd, 0xfa2dcd7d91a13fa8,
-      0xda1a080e52a127b8, 0x19c98f1f809c3d84, 0x2cef109af4678c88,
-      0x53462accab3b9132, 0x176b13a80415394e, 0xea70047ef6bc178b,
-      0x57bca80506d6dcdf, 0xd853ba09ff09f5c4, 0x75f4df3a7ddd4775,
-      0x209c367ade62f4fe, 0xa9a0bbc74d5f4682, 0x5dfe34bada86c21a,
-      0xc2c05bbcd38566d1, 0x6de8088e348c916a, 0x6a7001c6000c2196,
-      0xd9fb51865fc4a367, 0x12f320e444ece8ff, 0x6d56f7f793d65035,
-      0x138f31b7a865f8aa, 0x58fc68b4026b9adf, 0xcd48954b79fb6436,
-      0x27dfce4a0232af87,
-  };
-
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  std::seed_seq seed_sequence{1, 2, 3};
-  pcg64_2018_engine engine(seed_sequence);
-  std::ostringstream stream;
-  stream << engine;
-  auto str = stream.str();
-  printf("%s\n\n", str.c_str());
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%016lx, ", engine());
-    if (i % 3 == 2) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  pcg64_2018_engine engine;
-  std::istringstream stream(
-      "2549297995355413924 4865540595714422341 6364136223846793005 "
-      "1442695040888963407 18088519957565336995 4845369368158826708");
-  stream >> engine;
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-// ------------------------------------------------------------------
-// Stability tests for pcg32_2018_engine
-// ------------------------------------------------------------------
-TEST(PCG322018EngineTest, VerifyGolden) {
-  constexpr uint32_t kGolden[kNumGoldenOutputs] = {
-      0x7a7ecbd9, 0x89fd6c06, 0xae646aa8, 0xcd3cf945, 0x6204b303, 0x198c8585,
-      0x49fce611, 0xd1e9297a, 0x142d9440, 0xee75f56b, 0x473a9117, 0xe3a45903,
-      0xbce807a1, 0xe54e5f4d, 0x497d6c51, 0x61829166, 0xa740474b, 0x031912a8,
-      0x9de3defa, 0xd266dbf1, 0x0f38bebb, 0xec3c4f65, 0x07c5057d, 0xbbce03c8,
-      0xfd2ac7a8, 0xffcf4773, 0x5b10affb, 0xede1c842, 0xe22b01b7, 0xda133c8c,
-      0xaf89b0f4, 0x25d1b8bc, 0x9f625482, 0x7bfd6882, 0x2e2210c0, 0x2c8fb9a6,
-      0x42cb3b83, 0x40ce0dab, 0x644a3510, 0x36230ef2, 0xe2cb6d43, 0x1012b343,
-      0x746c6c9f, 0x36714cf8, 0xed1f5026, 0x8bbbf83e, 0xe98710f4, 0x8a2afa36,
-      0x09035349, 0x6dc1a487, 0x682b634b, 0xc106794f, 0x7dd78beb, 0x628c262b,
-      0x852fb232, 0xb153ac4c, 0x4f169d1b, 0xa69ab774, 0x4bd4b6f2, 0xdc351dd3,
-      0x93ff3c8c, 0xa30819ab, 0xff07758c, 0x5ab13c62, 0xd16d7fb5, 0xc4950ffa,
-      0xd309ae49, 0xb9677a87, 0x4464e317, 0x90dc44f1, 0xc694c1d4, 0x1d5e1168,
-      0xadf37a2d, 0xda38990d, 0x1ec4bd33, 0x36ca25ce, 0xfa0dc76a, 0x968a9d43,
-      0x6950ac39, 0xdd3276bc, 0x06d5a71e, 0x1f6f282d, 0x5c626c62, 0xdde3fc31,
-      0x152194ce, 0xc35ed14c, 0xb1f7224e, 0x47f76bb8, 0xb34fdd08, 0x7011395e,
-      0x162d2a49, 0x0d1bf09f, 0x9428a952, 0x03c5c344, 0xd3525616, 0x7816fff3,
-      0x6bceb8a8, 0x8345a081, 0x366420fd, 0x182abeda, 0x70f82745, 0xaf15ded8,
-      0xc7f52ca2, 0xa98db9c5, 0x919d99ba, 0x9c376c1c, 0xed8d34c2, 0x716ae9f5,
-      0xef062fa5, 0xee3b6c56, 0x52325658, 0x61afa9c3, 0xfdaf02f0, 0x961cf3ab,
-      0x9f291565, 0x4fbf3045, 0x0590c899, 0xde901385, 0x45005ffb, 0x509db162,
-      0x262fa941, 0x4c421653, 0x4b17c21e, 0xea0d1530, 0xde803845, 0x61bfd515,
-      0x438523ef,
-  };
-
-  pcg32_2018_engine engine(0);
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%08x, ", engine());
-    if (i % 6 == 5) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed();
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(PCG322018EngineTest, VerifyGoldenSeeded) {
-  constexpr uint32_t kGolden[kNumGoldenOutputs] = {
-      0x60b5a64c, 0x978502f9, 0x80a75f60, 0x241f1158, 0xa4cd1dbb, 0xe7284017,
-      0x3b678da5, 0x5223ec99, 0xe4bdd5d9, 0x72190e6d, 0xe6e702c9, 0xff80c768,
-      0xcf126ed3, 0x1fbd20ab, 0x60980489, 0xbc72bf89, 0x407ac6c0, 0x00bf3c51,
-      0xf9087897, 0x172e4eb6, 0xe9e4f443, 0x1a6098bf, 0xbf44f8c2, 0xdd84a0e5,
-      0xd9a52364, 0xc0e2e786, 0x061ae2ba, 0x9facb8e3, 0x6109432d, 0xd4e0a013,
-      0xbd8eb9a6, 0x7e86c3b6, 0x629c0e68, 0x05337430, 0xb495b9f4, 0x11ccd65d,
-      0xb578db25, 0x66f1246d, 0x6ef20a7f, 0x5e429812, 0x11772130, 0xb944b5c2,
-      0x01624128, 0xa2385ab7, 0xd3e10d35, 0xbe570ec3, 0xc951656f, 0xbe8944a0,
-      0x7be41062, 0x5709f919, 0xd745feda, 0x9870b9ae, 0xb44b8168, 0x19e7683b,
-      0xded8017f, 0xc6e4d544, 0x91ae4225, 0xd6745fba, 0xb992f284, 0x65b12b33,
-      0xa9d5fdb4, 0xf105ce1a, 0x35ca1a6e, 0x2ff70dd0, 0xd8335e49, 0xfb71ddf2,
-      0xcaeabb89, 0x5c6f5f84, 0x9a811a7d, 0xbcecbbd1, 0x0f661ba0, 0x9ad93b9d,
-      0xedd23e0b, 0x42062f48, 0xd38dd7e4, 0x6cd63c9c, 0x640b98ae, 0x4bff5653,
-      0x12626371, 0x13266017, 0xe7a698d8, 0x39c74667, 0xe8fdf2e3, 0x52803bf8,
-      0x2af6895b, 0x91335b7b, 0x699e4961, 0x00a40fff, 0x253ff2b6, 0x4a6cf672,
-      0x9584e85f, 0xf2a5000c, 0x4d58aba8, 0xb8513e6a, 0x767fad65, 0x8e326f9e,
-      0x182f15a1, 0x163dab52, 0xdf99c780, 0x047282a1, 0xee4f90dd, 0xd50394ae,
-      0x6c9fd5f0, 0xb06a9194, 0x387e3840, 0x04a9487b, 0xf678a4c2, 0xd0a78810,
-      0xd502c97e, 0xd6a9b12a, 0x4accc5dc, 0x416ed53e, 0x50411536, 0xeeb89c24,
-      0x813a7902, 0x034ebca6, 0xffa52e7c, 0x7ecd3d0e, 0xfa37a0d2, 0xb1fbe2c1,
-      0xb7efc6d1, 0xefa4ccee, 0xf6f80424, 0x2283f3d9, 0x68732284, 0x94f3b5c8,
-      0xbbdeceb9,
-  };
-
-  ExplicitSeedSeq seed_sequence{12, 34, 56};
-  pcg32_2018_engine engine(seed_sequence);
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%08x, ", engine());
-    if (i % 6 == 5) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed(seed_sequence);
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(PCG322018EngineTest, VerifyGoldenFromDeserializedEngine) {
-  constexpr uint64_t kGolden[kNumGoldenOutputs] = {
-      0x780f7042, 0xba137215, 0x43ab6f22, 0x0cb55f46, 0x44b2627d, 0x835597af,
-      0xea973ea1, 0x0d2abd35, 0x4fdd601c, 0xac4342fe, 0x7db7e93c, 0xe56ebcaf,
-      0x3596470a, 0x7770a9ad, 0x9b893320, 0x57db3415, 0xb432de54, 0xa02baf71,
-      0xa256aadb, 0x88921fc7, 0xa35fa6b3, 0xde3eca46, 0x605739a7, 0xa890b82b,
-      0xe457b7ad, 0x335fb903, 0xeb06790c, 0xb3c54bf6, 0x6141e442, 0xa599a482,
-      0xb78987cc, 0xc61dfe9d, 0x0f1d6ace, 0x17460594, 0x8f6a5061, 0x083dc354,
-      0xe9c337fb, 0xcfd105f7, 0x926764b6, 0x638d24dc, 0xeaac650a, 0x67d2cb9c,
-      0xd807733c, 0x205fc52e, 0xf5399e2e, 0x6c46ddcc, 0xb603e875, 0xce113a25,
-      0x3c8d4813, 0xfb584db8, 0xf6d255ff, 0xea80954f, 0x42e8be85, 0xb2feee72,
-      0x62bd8d16, 0x1be4a142, 0x97dca1a4, 0xdd6e7333, 0xb2caa20e, 0xa12b1588,
-      0xeb3a5a1a, 0x6fa5ba89, 0x077ea931, 0x8ddb1713, 0x0dd03079, 0x2c2ba965,
-      0xa77fac17, 0xc8325742, 0x8bb893bf, 0xc2315741, 0xeaceee92, 0x81dd2ee2,
-      0xe5214216, 0x1b9b8fb2, 0x01646d03, 0x24facc25, 0xd8c0e0bb, 0xa33fe106,
-      0xf34fe976, 0xb3b4b44e, 0x65618fed, 0x032c6192, 0xa9dd72ce, 0xf391887b,
-      0xf41c6a6e, 0x05c4bd6d, 0x37fa260e, 0x46b05659, 0xb5f6348a, 0x62d26d89,
-      0x39f6452d, 0xb17b30a2, 0xbdd82743, 0x38ecae3b, 0xfe90f0a2, 0xcb2d226d,
-      0xcf8a0b1c, 0x0eed3d4d, 0xa1f69cfc, 0xd7ac3ba5, 0xce9d9a6b, 0x121deb4c,
-      0x4a0d03f3, 0xc1821ed1, 0x59c249ac, 0xc0abb474, 0x28149985, 0xfd9a82ba,
-      0x5960c3b2, 0xeff00cba, 0x6073aa17, 0x25dc0919, 0x9976626e, 0xdd2ccc33,
-      0x39ecb6ec, 0xc6e15d13, 0xfac94cfd, 0x28cfd34f, 0xf2d2c32d, 0x51c23d08,
-      0x4fdb2f48, 0x97baa807, 0xf2c1004c, 0xc4ae8136, 0x71f31c94, 0x8c92d601,
-      0x36caf5cd,
-  };
-
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  std::seed_seq seed_sequence{1, 2, 3};
-  pcg32_2018_engine engine(seed_sequence);
-  std::ostringstream stream;
-  stream << engine;
-  auto str = stream.str();
-  printf("%s\n\n", str.c_str());
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%08x, ", engine());
-    if (i % 6 == 5) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-
-  EXPECT_FALSE(true);
-#else
-  pcg32_2018_engine engine;
-  std::istringstream stream(
-      "6364136223846793005 1442695040888963407 6537028157270659894");
-  stream >> engine;
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/platform.h b/third_party/abseil_cpp/absl/random/internal/platform.h
deleted file mode 100644
index bbdb4e620816..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/platform.h
+++ /dev/null
@@ -1,171 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_PLATFORM_H_
-#define ABSL_RANDOM_INTERNAL_PLATFORM_H_
-
-// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
-// symbols from arbitrary system and other headers, since it may be built
-// with different flags from other targets, using different levels of
-// optimization, potentially introducing ODR violations.
-
-// -----------------------------------------------------------------------------
-// Platform Feature Checks
-// -----------------------------------------------------------------------------
-
-// Currently supported operating systems and associated preprocessor
-// symbols:
-//
-//   Linux and Linux-derived           __linux__
-//   Android                           __ANDROID__ (implies __linux__)
-//   Linux (non-Android)               __linux__ && !__ANDROID__
-//   Darwin (macOS and iOS)            __APPLE__
-//   Akaros (http://akaros.org)        __ros__
-//   Windows                           _WIN32
-//   NaCL                              __native_client__
-//   AsmJS                             __asmjs__
-//   WebAssembly                       __wasm__
-//   Fuchsia                           __Fuchsia__
-//
-// Note that since Android defines both __ANDROID__ and __linux__, one
-// may probe for either Linux or Android by simply testing for __linux__.
-//
-// NOTE: For __APPLE__ platforms, we use #include <TargetConditionals.h>
-// to distinguish os variants.
-//
-// http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system
-
-#if defined(__APPLE__)
-#include <TargetConditionals.h>
-#endif
-
-// -----------------------------------------------------------------------------
-// Architecture Checks
-// -----------------------------------------------------------------------------
-
-// These preprocessor directives are trying to determine CPU architecture,
-// including necessary headers to support hardware AES.
-//
-// ABSL_ARCH_{X86/PPC/ARM} macros determine the platform.
-#if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64) || \
-    defined(_M_X64)
-#define ABSL_ARCH_X86_64
-#elif defined(__i386) || defined(_M_IX86)
-#define ABSL_ARCH_X86_32
-#elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
-#define ABSL_ARCH_AARCH64
-#elif defined(__arm__) || defined(__ARMEL__) || defined(_M_ARM)
-#define ABSL_ARCH_ARM
-#elif defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
-    defined(__ppc__) || defined(__PPC__)
-#define ABSL_ARCH_PPC
-#else
-// Unsupported architecture.
-//  * https://sourceforge.net/p/predef/wiki/Architectures/
-//  * https://msdn.microsoft.com/en-us/library/b0084kay.aspx
-//  * for gcc, clang: "echo | gcc -E -dM -"
-#endif
-
-// -----------------------------------------------------------------------------
-// Attribute Checks
-// -----------------------------------------------------------------------------
-
-// ABSL_RANDOM_INTERNAL_RESTRICT annotates whether pointers may be considered
-// to be unaliased.
-#if defined(__clang__) || defined(__GNUC__)
-#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict__
-#elif defined(_MSC_VER)
-#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict
-#else
-#define ABSL_RANDOM_INTERNAL_RESTRICT
-#endif
-
-// ABSL_HAVE_ACCELERATED_AES indicates whether the currently active compiler
-// flags (e.g. -maes) allow using hardware accelerated AES instructions, which
-// implies us assuming that the target platform supports them.
-#define ABSL_HAVE_ACCELERATED_AES 0
-
-#if defined(ABSL_ARCH_X86_64)
-
-#if defined(__AES__) || defined(__AVX__)
-#undef ABSL_HAVE_ACCELERATED_AES
-#define ABSL_HAVE_ACCELERATED_AES 1
-#endif
-
-#elif defined(ABSL_ARCH_PPC)
-
-// Rely on VSX and CRYPTO extensions for vcipher on PowerPC.
-#if (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \
-    defined(__CRYPTO__)
-#undef ABSL_HAVE_ACCELERATED_AES
-#define ABSL_HAVE_ACCELERATED_AES 1
-#endif
-
-#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
-
-// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf
-// Rely on NEON+CRYPTO extensions for ARM.
-#if defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO)
-#undef ABSL_HAVE_ACCELERATED_AES
-#define ABSL_HAVE_ACCELERATED_AES 1
-#endif
-
-#endif
-
-// NaCl does not allow AES.
-#if defined(__native_client__)
-#undef ABSL_HAVE_ACCELERATED_AES
-#define ABSL_HAVE_ACCELERATED_AES 0
-#endif
-
-// ABSL_RANDOM_INTERNAL_AES_DISPATCH indicates whether the currently active
-// platform has, or should use run-time dispatch for selecting the
-// acclerated Randen implementation.
-#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
-
-#if defined(ABSL_ARCH_X86_64)
-// Dispatch is available on x86_64
-#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
-#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
-#elif defined(__linux__) && defined(ABSL_ARCH_PPC)
-// Or when running linux PPC
-#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
-#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
-#elif defined(__linux__) && defined(ABSL_ARCH_AARCH64)
-// Or when running linux AArch64
-#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
-#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
-#elif defined(__linux__) && defined(ABSL_ARCH_ARM) && (__ARM_ARCH >= 8)
-// Or when running linux ARM v8 or higher.
-// (This captures a lot of Android configurations.)
-#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
-#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
-#endif
-
-// NaCl does not allow dispatch.
-#if defined(__native_client__)
-#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
-#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
-#endif
-
-// iOS does not support dispatch, even on x86, since applications
-// should be bundled as fat binaries, with a different build tailored for
-// each specific supported platform/architecture.
-#if (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \
-    (defined(TARGET_OS_IPHONE_SIMULATOR) && TARGET_OS_IPHONE_SIMULATOR)
-#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
-#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
-#endif
-
-#endif  // ABSL_RANDOM_INTERNAL_PLATFORM_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/pool_urbg.cc b/third_party/abseil_cpp/absl/random/internal/pool_urbg.cc
deleted file mode 100644
index 5bee530770eb..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/pool_urbg.cc
+++ /dev/null
@@ -1,254 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/pool_urbg.h"
-
-#include <algorithm>
-#include <atomic>
-#include <cstdint>
-#include <cstring>
-#include <iterator>
-
-#include "absl/base/attributes.h"
-#include "absl/base/call_once.h"
-#include "absl/base/config.h"
-#include "absl/base/internal/endian.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/spinlock.h"
-#include "absl/base/internal/sysinfo.h"
-#include "absl/base/internal/unaligned_access.h"
-#include "absl/base/optimization.h"
-#include "absl/random/internal/randen.h"
-#include "absl/random/internal/seed_material.h"
-#include "absl/random/seed_gen_exception.h"
-
-using absl::base_internal::SpinLock;
-using absl::base_internal::SpinLockHolder;
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-
-// RandenPoolEntry is a thread-safe pseudorandom bit generator, implementing a
-// single generator within a RandenPool<T>. It is an internal implementation
-// detail, and does not aim to conform to [rand.req.urng].
-//
-// NOTE: There are alignment issues when used on ARM, for instance.
-// See the allocation code in PoolAlignedAlloc().
-class RandenPoolEntry {
- public:
-  static constexpr size_t kState = RandenTraits::kStateBytes / sizeof(uint32_t);
-  static constexpr size_t kCapacity =
-      RandenTraits::kCapacityBytes / sizeof(uint32_t);
-
-  void Init(absl::Span<const uint32_t> data) {
-    SpinLockHolder l(&mu_);  // Always uncontested.
-    std::copy(data.begin(), data.end(), std::begin(state_));
-    next_ = kState;
-  }
-
-  // Copy bytes into out.
-  void Fill(uint8_t* out, size_t bytes) ABSL_LOCKS_EXCLUDED(mu_);
-
-  // Returns random bits from the buffer in units of T.
-  template <typename T>
-  inline T Generate() ABSL_LOCKS_EXCLUDED(mu_);
-
-  inline void MaybeRefill() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu_) {
-    if (next_ >= kState) {
-      next_ = kCapacity;
-      impl_.Generate(state_);
-    }
-  }
-
- private:
-  // Randen URBG state.
-  uint32_t state_[kState] ABSL_GUARDED_BY(mu_);  // First to satisfy alignment.
-  SpinLock mu_;
-  const Randen impl_;
-  size_t next_ ABSL_GUARDED_BY(mu_);
-};
-
-template <>
-inline uint8_t RandenPoolEntry::Generate<uint8_t>() {
-  SpinLockHolder l(&mu_);
-  MaybeRefill();
-  return static_cast<uint8_t>(state_[next_++]);
-}
-
-template <>
-inline uint16_t RandenPoolEntry::Generate<uint16_t>() {
-  SpinLockHolder l(&mu_);
-  MaybeRefill();
-  return static_cast<uint16_t>(state_[next_++]);
-}
-
-template <>
-inline uint32_t RandenPoolEntry::Generate<uint32_t>() {
-  SpinLockHolder l(&mu_);
-  MaybeRefill();
-  return state_[next_++];
-}
-
-template <>
-inline uint64_t RandenPoolEntry::Generate<uint64_t>() {
-  SpinLockHolder l(&mu_);
-  if (next_ >= kState - 1) {
-    next_ = kCapacity;
-    impl_.Generate(state_);
-  }
-  auto p = state_ + next_;
-  next_ += 2;
-
-  uint64_t result;
-  std::memcpy(&result, p, sizeof(result));
-  return result;
-}
-
-void RandenPoolEntry::Fill(uint8_t* out, size_t bytes) {
-  SpinLockHolder l(&mu_);
-  while (bytes > 0) {
-    MaybeRefill();
-    size_t remaining = (kState - next_) * sizeof(state_[0]);
-    size_t to_copy = std::min(bytes, remaining);
-    std::memcpy(out, &state_[next_], to_copy);
-    out += to_copy;
-    bytes -= to_copy;
-    next_ += (to_copy + sizeof(state_[0]) - 1) / sizeof(state_[0]);
-  }
-}
-
-// Number of pooled urbg entries.
-static constexpr int kPoolSize = 8;
-
-// Shared pool entries.
-static absl::once_flag pool_once;
-ABSL_CACHELINE_ALIGNED static RandenPoolEntry* shared_pools[kPoolSize];
-
-// Returns an id in the range [0 ... kPoolSize), which indexes into the
-// pool of random engines.
-//
-// Each thread to access the pool is assigned a sequential ID (without reuse)
-// from the pool-id space; the id is cached in a thread_local variable.
-// This id is assigned based on the arrival-order of the thread to the
-// GetPoolID call; this has no binary, CL, or runtime stability because
-// on subsequent runs the order within the same program may be significantly
-// different. However, as other thread IDs are not assigned sequentially,
-// this is not expected to matter.
-int GetPoolID() {
-  static_assert(kPoolSize >= 1,
-                "At least one urbg instance is required for PoolURBG");
-
-  ABSL_CONST_INIT static std::atomic<int64_t> sequence{0};
-
-#ifdef ABSL_HAVE_THREAD_LOCAL
-  static thread_local int my_pool_id = -1;
-  if (ABSL_PREDICT_FALSE(my_pool_id < 0)) {
-    my_pool_id = (sequence++ % kPoolSize);
-  }
-  return my_pool_id;
-#else
-  static pthread_key_t tid_key = [] {
-    pthread_key_t tmp_key;
-    int err = pthread_key_create(&tmp_key, nullptr);
-    if (err) {
-      ABSL_RAW_LOG(FATAL, "pthread_key_create failed with %d", err);
-    }
-    return tmp_key;
-  }();
-
-  // Store the value in the pthread_{get/set}specific. However an uninitialized
-  // value is 0, so add +1 to distinguish from the null value.
-  intptr_t my_pool_id =
-      reinterpret_cast<intptr_t>(pthread_getspecific(tid_key));
-  if (ABSL_PREDICT_FALSE(my_pool_id == 0)) {
-    // No allocated ID, allocate the next value, cache it, and return.
-    my_pool_id = (sequence++ % kPoolSize) + 1;
-    int err = pthread_setspecific(tid_key, reinterpret_cast<void*>(my_pool_id));
-    if (err) {
-      ABSL_RAW_LOG(FATAL, "pthread_setspecific failed with %d", err);
-    }
-  }
-  return my_pool_id - 1;
-#endif
-}
-
-// Allocate a RandenPoolEntry with at least 32-byte alignment, which is required
-// by ARM platform code.
-RandenPoolEntry* PoolAlignedAlloc() {
-  constexpr size_t kAlignment =
-      ABSL_CACHELINE_SIZE > 32 ? ABSL_CACHELINE_SIZE : 32;
-
-  // Not all the platforms that we build for have std::aligned_alloc, however
-  // since we never free these objects, we can over allocate and munge the
-  // pointers to the correct alignment.
-  void* memory = std::malloc(sizeof(RandenPoolEntry) + kAlignment);
-  auto x = reinterpret_cast<intptr_t>(memory);
-  auto y = x % kAlignment;
-  void* aligned =
-      (y == 0) ? memory : reinterpret_cast<void*>(x + kAlignment - y);
-  return new (aligned) RandenPoolEntry();
-}
-
-// Allocate and initialize kPoolSize objects of type RandenPoolEntry.
-//
-// The initialization strategy is to initialize one object directly from
-// OS entropy, then to use that object to seed all of the individual
-// pool instances.
-void InitPoolURBG() {
-  static constexpr size_t kSeedSize =
-      RandenTraits::kStateBytes / sizeof(uint32_t);
-  // Read the seed data from OS entropy once.
-  uint32_t seed_material[kPoolSize * kSeedSize];
-  if (!random_internal::ReadSeedMaterialFromOSEntropy(
-          absl::MakeSpan(seed_material))) {
-    random_internal::ThrowSeedGenException();
-  }
-  for (int i = 0; i < kPoolSize; i++) {
-    shared_pools[i] = PoolAlignedAlloc();
-    shared_pools[i]->Init(
-        absl::MakeSpan(&seed_material[i * kSeedSize], kSeedSize));
-  }
-}
-
-// Returns the pool entry for the current thread.
-RandenPoolEntry* GetPoolForCurrentThread() {
-  absl::call_once(pool_once, InitPoolURBG);
-  return shared_pools[GetPoolID()];
-}
-
-}  // namespace
-
-template <typename T>
-typename RandenPool<T>::result_type RandenPool<T>::Generate() {
-  auto* pool = GetPoolForCurrentThread();
-  return pool->Generate<T>();
-}
-
-template <typename T>
-void RandenPool<T>::Fill(absl::Span<result_type> data) {
-  auto* pool = GetPoolForCurrentThread();
-  pool->Fill(reinterpret_cast<uint8_t*>(data.data()),
-             data.size() * sizeof(result_type));
-}
-
-template class RandenPool<uint8_t>;
-template class RandenPool<uint16_t>;
-template class RandenPool<uint32_t>;
-template class RandenPool<uint64_t>;
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/pool_urbg.h b/third_party/abseil_cpp/absl/random/internal/pool_urbg.h
deleted file mode 100644
index 05721929f54e..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/pool_urbg.h
+++ /dev/null
@@ -1,131 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_POOL_URBG_H_
-#define ABSL_RANDOM_INTERNAL_POOL_URBG_H_
-
-#include <cinttypes>
-#include <limits>
-
-#include "absl/random/internal/traits.h"
-#include "absl/types/span.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// RandenPool is a thread-safe random number generator [random.req.urbg] that
-// uses an underlying pool of Randen generators to generate values.  Each thread
-// has affinity to one instance of the underlying pool generators.  Concurrent
-// access is guarded by a spin-lock.
-template <typename T>
-class RandenPool {
- public:
-  using result_type = T;
-  static_assert(std::is_unsigned<result_type>::value,
-                "RandenPool template argument must be a built-in unsigned "
-                "integer type");
-
-  static constexpr result_type(min)() {
-    return (std::numeric_limits<result_type>::min)();
-  }
-
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  RandenPool() {}
-
-  // Returns a single value.
-  inline result_type operator()() { return Generate(); }
-
-  // Fill data with random values.
-  static void Fill(absl::Span<result_type> data);
-
- protected:
-  // Generate returns a single value.
-  static result_type Generate();
-};
-
-extern template class RandenPool<uint8_t>;
-extern template class RandenPool<uint16_t>;
-extern template class RandenPool<uint32_t>;
-extern template class RandenPool<uint64_t>;
-
-// PoolURBG uses an underlying pool of random generators to implement a
-// thread-compatible [random.req.urbg] interface with an internal cache of
-// values.
-template <typename T, size_t kBufferSize>
-class PoolURBG {
-  // Inheritance to access the protected static members of RandenPool.
-  using unsigned_type = typename make_unsigned_bits<T>::type;
-  using PoolType = RandenPool<unsigned_type>;
-  using SpanType = absl::Span<unsigned_type>;
-
-  static constexpr size_t kInitialBuffer = kBufferSize + 1;
-  static constexpr size_t kHalfBuffer = kBufferSize / 2;
-
- public:
-  using result_type = T;
-
-  static_assert(std::is_unsigned<result_type>::value,
-                "PoolURBG must be parameterized by an unsigned integer type");
-
-  static_assert(kBufferSize > 1,
-                "PoolURBG must be parameterized by a buffer-size > 1");
-
-  static_assert(kBufferSize <= 256,
-                "PoolURBG must be parameterized by a buffer-size <= 256");
-
-  static constexpr result_type(min)() {
-    return (std::numeric_limits<result_type>::min)();
-  }
-
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  PoolURBG() : next_(kInitialBuffer) {}
-
-  // copy-constructor does not copy cache.
-  PoolURBG(const PoolURBG&) : next_(kInitialBuffer) {}
-  const PoolURBG& operator=(const PoolURBG&) {
-    next_ = kInitialBuffer;
-    return *this;
-  }
-
-  // move-constructor does move cache.
-  PoolURBG(PoolURBG&&) = default;
-  PoolURBG& operator=(PoolURBG&&) = default;
-
-  inline result_type operator()() {
-    if (next_ >= kBufferSize) {
-      next_ = (kBufferSize > 2 && next_ > kBufferSize) ? kHalfBuffer : 0;
-      PoolType::Fill(SpanType(reinterpret_cast<unsigned_type*>(state_ + next_),
-                              kBufferSize - next_));
-    }
-    return state_[next_++];
-  }
-
- private:
-  // Buffer size.
-  size_t next_;  // index within state_
-  result_type state_[kBufferSize];
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_POOL_URBG_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/pool_urbg_test.cc b/third_party/abseil_cpp/absl/random/internal/pool_urbg_test.cc
deleted file mode 100644
index 53f4eacf16fe..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/pool_urbg_test.cc
+++ /dev/null
@@ -1,182 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/pool_urbg.h"
-
-#include <algorithm>
-#include <bitset>
-#include <cmath>
-#include <cstdint>
-#include <iterator>
-
-#include "gtest/gtest.h"
-#include "absl/meta/type_traits.h"
-#include "absl/types/span.h"
-
-using absl::random_internal::PoolURBG;
-using absl::random_internal::RandenPool;
-
-namespace {
-
-// is_randen_pool trait is true when parameterized by an RandenPool
-template <typename T>
-using is_randen_pool = typename absl::disjunction<  //
-    std::is_same<T, RandenPool<uint8_t>>,           //
-    std::is_same<T, RandenPool<uint16_t>>,          //
-    std::is_same<T, RandenPool<uint32_t>>,          //
-    std::is_same<T, RandenPool<uint64_t>>>;         //
-
-// MyFill either calls RandenPool::Fill() or std::generate(..., rng)
-template <typename T, typename V>
-typename absl::enable_if_t<absl::negation<is_randen_pool<T>>::value, void>  //
-MyFill(T& rng, absl::Span<V> data) {  // NOLINT(runtime/references)
-  std::generate(std::begin(data), std::end(data), rng);
-}
-
-template <typename T, typename V>
-typename absl::enable_if_t<is_randen_pool<T>::value, void>  //
-MyFill(T& rng, absl::Span<V> data) {  // NOLINT(runtime/references)
-  rng.Fill(data);
-}
-
-template <typename EngineType>
-class PoolURBGTypedTest : public ::testing::Test {};
-
-using EngineTypes = ::testing::Types<  //
-    RandenPool<uint8_t>,               //
-    RandenPool<uint16_t>,              //
-    RandenPool<uint32_t>,              //
-    RandenPool<uint64_t>,              //
-    PoolURBG<uint8_t, 2>,              //
-    PoolURBG<uint16_t, 2>,             //
-    PoolURBG<uint32_t, 2>,             //
-    PoolURBG<uint64_t, 2>,             //
-    PoolURBG<unsigned int, 8>,         // NOLINT(runtime/int)
-    PoolURBG<unsigned long, 8>,        // NOLINT(runtime/int)
-    PoolURBG<unsigned long int, 4>,    // NOLINT(runtime/int)
-    PoolURBG<unsigned long long, 4>>;  // NOLINT(runtime/int)
-
-TYPED_TEST_SUITE(PoolURBGTypedTest, EngineTypes);
-
-// This test is checks that the engines meet the URBG interface requirements
-// defined in [rand.req.urbg].
-TYPED_TEST(PoolURBGTypedTest, URBGInterface) {
-  using E = TypeParam;
-  using T = typename E::result_type;
-
-  static_assert(std::is_copy_constructible<E>::value,
-                "engine must be copy constructible");
-
-  static_assert(absl::is_copy_assignable<E>::value,
-                "engine must be copy assignable");
-
-  E e;
-  const E x;
-
-  e();
-
-  static_assert(std::is_same<decltype(e()), T>::value,
-                "return type of operator() must be result_type");
-
-  E u0(x);
-  u0();
-
-  E u1 = e;
-  u1();
-}
-
-// This validates that sequences are independent.
-TYPED_TEST(PoolURBGTypedTest, VerifySequences) {
-  using E = TypeParam;
-  using result_type = typename E::result_type;
-
-  E rng;
-  (void)rng();  // Discard one value.
-
-  constexpr int kNumOutputs = 64;
-  result_type a[kNumOutputs];
-  result_type b[kNumOutputs];
-  std::fill(std::begin(b), std::end(b), 0);
-
-  // Fill a using Fill or generate, depending on the engine type.
-  {
-    E x = rng;
-    MyFill(x, absl::MakeSpan(a));
-  }
-
-  // Fill b using std::generate().
-  {
-    E x = rng;
-    std::generate(std::begin(b), std::end(b), x);
-  }
-
-  // Test that generated sequence changed as sequence of bits, i.e. if about
-  // half of the bites were flipped between two non-correlated values.
-  size_t changed_bits = 0;
-  size_t unchanged_bits = 0;
-  size_t total_set = 0;
-  size_t total_bits = 0;
-  size_t equal_count = 0;
-  for (size_t i = 0; i < kNumOutputs; ++i) {
-    equal_count += (a[i] == b[i]) ? 1 : 0;
-    std::bitset<sizeof(result_type) * 8> bitset(a[i] ^ b[i]);
-    changed_bits += bitset.count();
-    unchanged_bits += bitset.size() - bitset.count();
-
-    std::bitset<sizeof(result_type) * 8> a_set(a[i]);
-    std::bitset<sizeof(result_type) * 8> b_set(b[i]);
-    total_set += a_set.count() + b_set.count();
-    total_bits += 2 * 8 * sizeof(result_type);
-  }
-  // On average, half the bits are changed between two calls.
-  EXPECT_LE(changed_bits, 0.60 * (changed_bits + unchanged_bits));
-  EXPECT_GE(changed_bits, 0.40 * (changed_bits + unchanged_bits));
-
-  // verify using a quick normal-approximation to the binomial.
-  EXPECT_NEAR(total_set, total_bits * 0.5, 4 * std::sqrt(total_bits))
-      << "@" << total_set / static_cast<double>(total_bits);
-
-  // Also, A[i] == B[i] with probability (1/range) * N.
-  // Give this a pretty wide latitude, though.
-  const double kExpected = kNumOutputs / (1.0 * sizeof(result_type) * 8);
-  EXPECT_LE(equal_count, 1.0 + kExpected);
-}
-
-}  // namespace
-
-/*
-$ nanobenchmarks 1 RandenPool construct
-$ nanobenchmarks 1 PoolURBG construct
-
-RandenPool<uint32_t> | 1    | 1000 |    48482.00 ticks | 48.48 ticks | 13.9 ns
-RandenPool<uint32_t> | 10   | 2000 |  1028795.00 ticks | 51.44 ticks | 14.7 ns
-RandenPool<uint32_t> | 100  | 1000 |  5119968.00 ticks | 51.20 ticks | 14.6 ns
-RandenPool<uint32_t> | 1000 |  500 | 25867936.00 ticks | 51.74 ticks | 14.8 ns
-
-RandenPool<uint64_t> | 1    | 1000 |    49921.00 ticks | 49.92 ticks | 14.3 ns
-RandenPool<uint64_t> | 10   | 2000 |  1208269.00 ticks | 60.41 ticks | 17.3 ns
-RandenPool<uint64_t> | 100  | 1000 |  5844955.00 ticks | 58.45 ticks | 16.7 ns
-RandenPool<uint64_t> | 1000 |  500 | 28767404.00 ticks | 57.53 ticks | 16.4 ns
-
-PoolURBG<uint32_t,8> | 1    | 1000 |    86431.00 ticks | 86.43 ticks | 24.7 ns
-PoolURBG<uint32_t,8> | 10   | 1000 |   206191.00 ticks | 20.62 ticks |  5.9 ns
-PoolURBG<uint32_t,8> | 100  | 1000 |  1516049.00 ticks | 15.16 ticks |  4.3 ns
-PoolURBG<uint32_t,8> | 1000 |  500 |  7613936.00 ticks | 15.23 ticks |  4.4 ns
-
-PoolURBG<uint64_t,4> | 1    | 1000 |    96668.00 ticks | 96.67 ticks | 27.6 ns
-PoolURBG<uint64_t,4> | 10   | 1000 |   282423.00 ticks | 28.24 ticks |  8.1 ns
-PoolURBG<uint64_t,4> | 100  | 1000 |  2609587.00 ticks | 26.10 ticks |  7.5 ns
-PoolURBG<uint64_t,4> | 1000 |  500 | 12408757.00 ticks | 24.82 ticks |  7.1 ns
-
-*/
diff --git a/third_party/abseil_cpp/absl/random/internal/randen.cc b/third_party/abseil_cpp/absl/random/internal/randen.cc
deleted file mode 100644
index 78a1e00c0832..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen.cc
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/randen.h"
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/random/internal/randen_detect.h"
-
-// RANDen = RANDom generator or beetroots in Swiss German.
-// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
-// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
-//
-// High-level summary:
-// 1) Reverie (see "A Robust and Sponge-Like PRNG with Improved Efficiency") is
-//    a sponge-like random generator that requires a cryptographic permutation.
-//    It improves upon "Provably Robust Sponge-Based PRNGs and KDFs" by
-//    achieving backtracking resistance with only one Permute() per buffer.
-//
-// 2) "Simpira v2: A Family of Efficient Permutations Using the AES Round
-//    Function" constructs up to 1024-bit permutations using an improved
-//    Generalized Feistel network with 2-round AES-128 functions. This Feistel
-//    block shuffle achieves diffusion faster and is less vulnerable to
-//    sliced-biclique attacks than the Type-2 cyclic shuffle.
-//
-// 3) "Improving the Generalized Feistel" and "New criterion for diffusion
-//    property" extends the same kind of improved Feistel block shuffle to 16
-//    branches, which enables a 2048-bit permutation.
-//
-// We combine these three ideas and also change Simpira's subround keys from
-// structured/low-entropy counters to digits of Pi.
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-
-struct RandenState {
-  const void* keys;
-  bool has_crypto;
-};
-
-RandenState GetRandenState() {
-  static const RandenState state = []() {
-    RandenState tmp;
-#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
-    // HW AES Dispatch.
-    if (HasRandenHwAesImplementation() && CPUSupportsRandenHwAes()) {
-      tmp.has_crypto = true;
-      tmp.keys = RandenHwAes::GetKeys();
-    } else {
-      tmp.has_crypto = false;
-      tmp.keys = RandenSlow::GetKeys();
-    }
-#elif ABSL_HAVE_ACCELERATED_AES
-    // HW AES is enabled.
-    tmp.has_crypto = true;
-    tmp.keys = RandenHwAes::GetKeys();
-#else
-    // HW AES is disabled.
-    tmp.has_crypto = false;
-    tmp.keys = RandenSlow::GetKeys();
-#endif
-    return tmp;
-  }();
-  return state;
-}
-
-}  // namespace
-
-Randen::Randen() {
-  auto tmp = GetRandenState();
-  keys_ = tmp.keys;
-#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
-  has_crypto_ = tmp.has_crypto;
-#endif
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/randen.h b/third_party/abseil_cpp/absl/random/internal/randen.h
deleted file mode 100644
index c2834aaf3d2c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen.h
+++ /dev/null
@@ -1,102 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_RANDEN_H_
-#define ABSL_RANDOM_INTERNAL_RANDEN_H_
-
-#include <cstddef>
-
-#include "absl/random/internal/platform.h"
-#include "absl/random/internal/randen_hwaes.h"
-#include "absl/random/internal/randen_slow.h"
-#include "absl/random/internal/randen_traits.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// RANDen = RANDom generator or beetroots in Swiss German.
-// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
-// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
-//
-// Randen implements the basic state manipulation methods.
-class Randen {
- public:
-  static constexpr size_t kStateBytes = RandenTraits::kStateBytes;
-  static constexpr size_t kCapacityBytes = RandenTraits::kCapacityBytes;
-  static constexpr size_t kSeedBytes = RandenTraits::kSeedBytes;
-
-  ~Randen() = default;
-
-  Randen();
-
-  // Generate updates the randen sponge. The outer portion of the sponge
-  // (kCapacityBytes .. kStateBytes) may be consumed as PRNG state.
-  template <typename T, size_t N>
-  void Generate(T (&state)[N]) const {
-    static_assert(N * sizeof(T) == kStateBytes,
-                  "Randen::Generate() requires kStateBytes of state");
-#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
-    // HW AES Dispatch.
-    if (has_crypto_) {
-      RandenHwAes::Generate(keys_, state);
-    } else {
-      RandenSlow::Generate(keys_, state);
-    }
-#elif ABSL_HAVE_ACCELERATED_AES
-    // HW AES is enabled.
-    RandenHwAes::Generate(keys_, state);
-#else
-    // HW AES is disabled.
-    RandenSlow::Generate(keys_, state);
-#endif
-  }
-
-  // Absorb incorporates additional seed material into the randen sponge.  After
-  // absorb returns, Generate must be called before the state may be consumed.
-  template <typename S, size_t M, typename T, size_t N>
-  void Absorb(const S (&seed)[M], T (&state)[N]) const {
-    static_assert(M * sizeof(S) == RandenTraits::kSeedBytes,
-                  "Randen::Absorb() requires kSeedBytes of seed");
-
-    static_assert(N * sizeof(T) == RandenTraits::kStateBytes,
-                  "Randen::Absorb() requires kStateBytes of state");
-#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
-    // HW AES Dispatch.
-    if (has_crypto_) {
-      RandenHwAes::Absorb(seed, state);
-    } else {
-      RandenSlow::Absorb(seed, state);
-    }
-#elif ABSL_HAVE_ACCELERATED_AES
-    // HW AES is enabled.
-    RandenHwAes::Absorb(seed, state);
-#else
-    // HW AES is disabled.
-    RandenSlow::Absorb(seed, state);
-#endif
-  }
-
- private:
-  const void* keys_;
-#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
-  bool has_crypto_;
-#endif
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_RANDEN_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc b/third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc
deleted file mode 100644
index f589172c0466..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc
+++ /dev/null
@@ -1,174 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-#include "absl/random/internal/randen.h"
-
-#include <cstdint>
-#include <cstdio>
-#include <cstring>
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/random/internal/nanobenchmark.h"
-#include "absl/random/internal/platform.h"
-#include "absl/random/internal/randen_engine.h"
-#include "absl/random/internal/randen_hwaes.h"
-#include "absl/random/internal/randen_slow.h"
-#include "absl/strings/numbers.h"
-
-namespace {
-
-using absl::random_internal::Randen;
-using absl::random_internal::RandenHwAes;
-using absl::random_internal::RandenSlow;
-
-using absl::random_internal_nanobenchmark::FuncInput;
-using absl::random_internal_nanobenchmark::FuncOutput;
-using absl::random_internal_nanobenchmark::InvariantTicksPerSecond;
-using absl::random_internal_nanobenchmark::MeasureClosure;
-using absl::random_internal_nanobenchmark::Params;
-using absl::random_internal_nanobenchmark::PinThreadToCPU;
-using absl::random_internal_nanobenchmark::Result;
-
-// Local state parameters.
-static constexpr size_t kStateSizeT = Randen::kStateBytes / sizeof(uint64_t);
-static constexpr size_t kSeedSizeT = Randen::kSeedBytes / sizeof(uint32_t);
-
-// Randen implementation benchmarks.
-template <typename T>
-struct AbsorbFn : public T {
-  mutable uint64_t state[kStateSizeT] = {};
-  mutable uint32_t seed[kSeedSizeT] = {};
-
-  static constexpr size_t bytes() { return sizeof(seed); }
-
-  FuncOutput operator()(const FuncInput num_iters) const {
-    for (size_t i = 0; i < num_iters; ++i) {
-      this->Absorb(seed, state);
-    }
-    return state[0];
-  }
-};
-
-template <typename T>
-struct GenerateFn : public T {
-  mutable uint64_t state[kStateSizeT];
-  GenerateFn() { std::memset(state, 0, sizeof(state)); }
-
-  static constexpr size_t bytes() { return sizeof(state); }
-
-  FuncOutput operator()(const FuncInput num_iters) const {
-    const auto* keys = this->GetKeys();
-    for (size_t i = 0; i < num_iters; ++i) {
-      this->Generate(keys, state);
-    }
-    return state[0];
-  }
-};
-
-template <typename UInt>
-struct Engine {
-  mutable absl::random_internal::randen_engine<UInt> rng;
-
-  static constexpr size_t bytes() { return sizeof(UInt); }
-
-  FuncOutput operator()(const FuncInput num_iters) const {
-    for (size_t i = 0; i < num_iters - 1; ++i) {
-      rng();
-    }
-    return rng();
-  }
-};
-
-template <size_t N>
-void Print(const char* name, const size_t n, const Result (&results)[N],
-           const size_t bytes) {
-  if (n == 0) {
-    ABSL_RAW_LOG(
-        WARNING,
-        "WARNING: Measurement failed, should not happen when using "
-        "PinThreadToCPU unless the region to measure takes > 1 second.\n");
-    return;
-  }
-
-  static const double ns_per_tick = 1e9 / InvariantTicksPerSecond();
-  static constexpr const double kNsPerS = 1e9;                 // ns/s
-  static constexpr const double kMBPerByte = 1.0 / 1048576.0;  // Mb / b
-  static auto header = [] {
-    return printf("%20s %8s: %12s ticks; %9s  (%9s) %8s\n", "Name", "Count",
-                  "Total", "Variance", "Time", "bytes/s");
-  }();
-  (void)header;
-
-  for (size_t i = 0; i < n; ++i) {
-    const double ticks_per_call = results[i].ticks / results[i].input;
-    const double ns_per_call = ns_per_tick * ticks_per_call;
-    const double bytes_per_ns = bytes / ns_per_call;
-    const double mb_per_s = bytes_per_ns * kNsPerS * kMBPerByte;
-    // Output
-    printf("%20s %8zu: %12.2f ticks; MAD=%4.2f%%  (%6.1f ns) %8.1f Mb/s\n",
-           name, results[i].input, results[i].ticks,
-           results[i].variability * 100.0, ns_per_call, mb_per_s);
-  }
-}
-
-// Fails here
-template <typename Op, size_t N>
-void Measure(const char* name, const FuncInput (&inputs)[N]) {
-  Op op;
-
-  Result results[N];
-  Params params;
-  params.verbose = false;
-  params.max_evals = 6;  // avoid test timeout
-  const size_t num_results = MeasureClosure(op, inputs, N, results, params);
-  Print(name, num_results, results, op.bytes());
-}
-
-// unpredictable == 1 but the compiler does not know that.
-void RunAll(const int argc, char* argv[]) {
-  if (argc == 2) {
-    int cpu = -1;
-    if (!absl::SimpleAtoi(argv[1], &cpu)) {
-      ABSL_RAW_LOG(FATAL, "The optional argument must be a CPU number >= 0.\n");
-    }
-    PinThreadToCPU(cpu);
-  }
-
-  // The compiler cannot reduce this to a constant.
-  const FuncInput unpredictable = (argc != 999);
-  static const FuncInput inputs[] = {unpredictable * 100, unpredictable * 1000};
-
-#if !defined(ABSL_INTERNAL_DISABLE_AES) && ABSL_HAVE_ACCELERATED_AES
-  Measure<AbsorbFn<RandenHwAes>>("Absorb (HwAes)", inputs);
-#endif
-  Measure<AbsorbFn<RandenSlow>>("Absorb (Slow)", inputs);
-
-#if !defined(ABSL_INTERNAL_DISABLE_AES) && ABSL_HAVE_ACCELERATED_AES
-  Measure<GenerateFn<RandenHwAes>>("Generate (HwAes)", inputs);
-#endif
-  Measure<GenerateFn<RandenSlow>>("Generate (Slow)", inputs);
-
-  // Measure the production engine.
-  static const FuncInput inputs1[] = {unpredictable * 1000,
-                                      unpredictable * 10000};
-  Measure<Engine<uint64_t>>("randen_engine<uint64_t>", inputs1);
-  Measure<Engine<uint32_t>>("randen_engine<uint32_t>", inputs1);
-}
-
-}  // namespace
-
-int main(int argc, char* argv[]) {
-  RunAll(argc, argv);
-  return 0;
-}
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_detect.cc b/third_party/abseil_cpp/absl/random/internal/randen_detect.cc
deleted file mode 100644
index bbe7b965329c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_detect.cc
+++ /dev/null
@@ -1,221 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
-// symbols from arbitrary system and other headers, since it may be built
-// with different flags from other targets, using different levels of
-// optimization, potentially introducing ODR violations.
-
-#include "absl/random/internal/randen_detect.h"
-
-#include <cstdint>
-#include <cstring>
-
-#include "absl/random/internal/platform.h"
-
-#if defined(ABSL_ARCH_X86_64)
-#define ABSL_INTERNAL_USE_X86_CPUID
-#elif defined(ABSL_ARCH_PPC) || defined(ABSL_ARCH_ARM) || \
-    defined(ABSL_ARCH_AARCH64)
-#if defined(__ANDROID__)
-#define ABSL_INTERNAL_USE_ANDROID_GETAUXVAL
-#define ABSL_INTERNAL_USE_GETAUXVAL
-#elif defined(__linux__)
-#define ABSL_INTERNAL_USE_LINUX_GETAUXVAL
-#define ABSL_INTERNAL_USE_GETAUXVAL
-#endif
-#endif
-
-#if defined(ABSL_INTERNAL_USE_X86_CPUID)
-#if defined(_WIN32) || defined(_WIN64)
-#include <intrin.h>  // NOLINT(build/include_order)
-#pragma intrinsic(__cpuid)
-#else
-// MSVC-equivalent __cpuid intrinsic function.
-static void __cpuid(int cpu_info[4], int info_type) {
-  __asm__ volatile("cpuid \n\t"
-                   : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]),
-                     "=d"(cpu_info[3])
-                   : "a"(info_type), "c"(0));
-}
-#endif
-#endif  // ABSL_INTERNAL_USE_X86_CPUID
-
-// On linux, just use the c-library getauxval call.
-#if defined(ABSL_INTERNAL_USE_LINUX_GETAUXVAL)
-
-extern "C" unsigned long getauxval(unsigned long type);  // NOLINT(runtime/int)
-
-static uint32_t GetAuxval(uint32_t hwcap_type) {
-  return static_cast<uint32_t>(getauxval(hwcap_type));
-}
-
-#endif
-
-// On android, probe the system's C library for getauxval().
-// This is the same technique used by the android NDK cpu features library
-// as well as the google open-source cpu_features library.
-//
-// TODO(absl-team): Consider implementing a fallback of directly reading
-// /proc/self/auxval.
-#if defined(ABSL_INTERNAL_USE_ANDROID_GETAUXVAL)
-#include <dlfcn.h>
-
-static uint32_t GetAuxval(uint32_t hwcap_type) {
-  // NOLINTNEXTLINE(runtime/int)
-  typedef unsigned long (*getauxval_func_t)(unsigned long);
-
-  dlerror();  // Cleaning error state before calling dlopen.
-  void* libc_handle = dlopen("libc.so", RTLD_NOW);
-  if (!libc_handle) {
-    return 0;
-  }
-  uint32_t result = 0;
-  void* sym = dlsym(libc_handle, "getauxval");
-  if (sym) {
-    getauxval_func_t func;
-    memcpy(&func, &sym, sizeof(func));
-    result = static_cast<uint32_t>((*func)(hwcap_type));
-  }
-  dlclose(libc_handle);
-  return result;
-}
-
-#endif
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// The default return at the end of the function might be unreachable depending
-// on the configuration. Ignore that warning.
-#if defined(__clang__)
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunreachable-code-return"
-#endif
-
-// CPUSupportsRandenHwAes returns whether the CPU is a microarchitecture
-// which supports the crpyto/aes instructions or extensions necessary to use the
-// accelerated RandenHwAes implementation.
-//
-// 1. For x86 it is sufficient to use the CPUID instruction to detect whether
-//    the cpu supports AES instructions. Done.
-//
-// Fon non-x86 it is much more complicated.
-//
-// 2. When ABSL_INTERNAL_USE_GETAUXVAL is defined, use getauxval() (either
-//    the direct c-library version, or the android probing version which loads
-//    libc), and read the hardware capability bits.
-//    This is based on the technique used by boringssl uses to detect
-//    cpu capabilities, and should allow us to enable crypto in the android
-//    builds where it is supported.
-//
-// 3. Use the default for the compiler architecture.
-//
-
-bool CPUSupportsRandenHwAes() {
-#if defined(ABSL_INTERNAL_USE_X86_CPUID)
-  // 1. For x86: Use CPUID to detect the required AES instruction set.
-  int regs[4];
-  __cpuid(reinterpret_cast<int*>(regs), 1);
-  return regs[2] & (1 << 25);  // AES
-
-#elif defined(ABSL_INTERNAL_USE_GETAUXVAL)
-  // 2. Use getauxval() to read the hardware bits and determine
-  // cpu capabilities.
-
-#define AT_HWCAP 16
-#define AT_HWCAP2 26
-#if defined(ABSL_ARCH_PPC)
-  // For Power / PPC: Expect that the cpu supports VCRYPTO
-  // See https://members.openpowerfoundation.org/document/dl/576
-  // VCRYPTO should be present in POWER8 >= 2.07.
-  // Uses Linux kernel constants from arch/powerpc/include/uapi/asm/cputable.h
-  static const uint32_t kVCRYPTO = 0x02000000;
-  const uint32_t hwcap = GetAuxval(AT_HWCAP2);
-  return (hwcap & kVCRYPTO) != 0;
-
-#elif defined(ABSL_ARCH_ARM)
-  // For ARM: Require crypto+neon
-  // http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0500f/CIHBIBBA.html
-  // Uses Linux kernel constants from arch/arm64/include/asm/hwcap.h
-  static const uint32_t kNEON = 1 << 12;
-  uint32_t hwcap = GetAuxval(AT_HWCAP);
-  if ((hwcap & kNEON) == 0) {
-    return false;
-  }
-
-  // And use it again to detect AES.
-  static const uint32_t kAES = 1 << 0;
-  const uint32_t hwcap2 = GetAuxval(AT_HWCAP2);
-  return (hwcap2 & kAES) != 0;
-
-#elif defined(ABSL_ARCH_AARCH64)
-  // For AARCH64: Require crypto+neon
-  // http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0500f/CIHBIBBA.html
-  static const uint32_t kNEON = 1 << 1;
-  static const uint32_t kAES = 1 << 3;
-  const uint32_t hwcap = GetAuxval(AT_HWCAP);
-  return ((hwcap & kNEON) != 0) && ((hwcap & kAES) != 0);
-#endif
-
-#else  // ABSL_INTERNAL_USE_GETAUXVAL
-  // 3. By default, assume that the compiler default.
-  return ABSL_HAVE_ACCELERATED_AES ? true : false;
-
-#endif
-  // NOTE: There are some other techniques that may be worth trying:
-  //
-  // * Use an environment variable: ABSL_RANDOM_USE_HWAES
-  //
-  // * Rely on compiler-generated target-based dispatch.
-  // Using x86/gcc it might look something like this:
-  //
-  // int __attribute__((target("aes"))) HasAes() { return 1; }
-  // int __attribute__((target("default"))) HasAes() { return 0; }
-  //
-  // This does not work on all architecture/compiler combinations.
-  //
-  // * On Linux consider reading /proc/cpuinfo and/or /proc/self/auxv.
-  // These files have lines which are easy to parse; for ARM/AARCH64 it is quite
-  // easy to find the Features: line and extract aes / neon. Likewise for
-  // PPC.
-  //
-  // * Fork a process and test for SIGILL:
-  //
-  // * Many architectures have instructions to read the ISA. Unfortunately
-  //   most of those require that the code is running in ring 0 /
-  //   protected-mode.
-  //
-  //   There are several examples. e.g. Valgrind detects PPC ISA 2.07:
-  //   https://github.com/lu-zero/valgrind/blob/master/none/tests/ppc64/test_isa_2_07_part1.c
-  //
-  //   MRS <Xt>, ID_AA64ISAR0_EL1 ; Read ID_AA64ISAR0_EL1 into Xt
-  //
-  //   uint64_t val;
-  //   __asm __volatile("mrs %0, id_aa64isar0_el1" :"=&r" (val));
-  //
-  // * Use a CPUID-style heuristic database.
-  //
-  // * On Apple (__APPLE__), AES is available on Arm v8.
-  //   https://stackoverflow.com/questions/45637888/how-to-determine-armv8-features-at-runtime-on-ios
-}
-
-#if defined(__clang__)
-#pragma clang diagnostic pop
-#endif
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_detect.h b/third_party/abseil_cpp/absl/random/internal/randen_detect.h
deleted file mode 100644
index f283f4322647..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_detect.h
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_RANDEN_DETECT_H_
-#define ABSL_RANDOM_INTERNAL_RANDEN_DETECT_H_
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// Returns whether the current CPU supports RandenHwAes implementation.
-// This typically involves supporting cryptographic extensions on whichever
-// platform is currently running.
-bool CPUSupportsRandenHwAes();
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_RANDEN_DETECT_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_engine.h b/third_party/abseil_cpp/absl/random/internal/randen_engine.h
deleted file mode 100644
index 6b33731336e7..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_engine.h
+++ /dev/null
@@ -1,230 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_RANDEN_ENGINE_H_
-#define ABSL_RANDOM_INTERNAL_RANDEN_ENGINE_H_
-
-#include <algorithm>
-#include <cinttypes>
-#include <cstdlib>
-#include <iostream>
-#include <iterator>
-#include <limits>
-#include <type_traits>
-
-#include "absl/meta/type_traits.h"
-#include "absl/random/internal/iostream_state_saver.h"
-#include "absl/random/internal/randen.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// Deterministic pseudorandom byte generator with backtracking resistance
-// (leaking the state does not compromise prior outputs). Based on Reverie
-// (see "A Robust and Sponge-Like PRNG with Improved Efficiency") instantiated
-// with an improved Simpira-like permutation.
-// Returns values of type "T" (must be a built-in unsigned integer type).
-//
-// RANDen = RANDom generator or beetroots in Swiss High German.
-// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
-// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
-template <typename T>
-class alignas(16) randen_engine {
- public:
-  // C++11 URBG interface:
-  using result_type = T;
-  static_assert(std::is_unsigned<result_type>::value,
-                "randen_engine template argument must be a built-in unsigned "
-                "integer type");
-
-  static constexpr result_type(min)() {
-    return (std::numeric_limits<result_type>::min)();
-  }
-
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  explicit randen_engine(result_type seed_value = 0) { seed(seed_value); }
-
-  template <class SeedSequence,
-            typename = typename absl::enable_if_t<
-                !std::is_same<SeedSequence, randen_engine>::value>>
-  explicit randen_engine(SeedSequence&& seq) {
-    seed(seq);
-  }
-
-  randen_engine(const randen_engine&) = default;
-
-  // Returns random bits from the buffer in units of result_type.
-  result_type operator()() {
-    // Refill the buffer if needed (unlikely).
-    if (next_ >= kStateSizeT) {
-      next_ = kCapacityT;
-      impl_.Generate(state_);
-    }
-
-    return state_[next_++];
-  }
-
-  template <class SeedSequence>
-  typename absl::enable_if_t<
-      !std::is_convertible<SeedSequence, result_type>::value>
-  seed(SeedSequence&& seq) {
-    // Zeroes the state.
-    seed();
-    reseed(seq);
-  }
-
-  void seed(result_type seed_value = 0) {
-    next_ = kStateSizeT;
-    // Zeroes the inner state and fills the outer state with seed_value to
-    // mimics behaviour of reseed
-    std::fill(std::begin(state_), std::begin(state_) + kCapacityT, 0);
-    std::fill(std::begin(state_) + kCapacityT, std::end(state_), seed_value);
-  }
-
-  // Inserts entropy into (part of) the state. Calling this periodically with
-  // sufficient entropy ensures prediction resistance (attackers cannot predict
-  // future outputs even if state is compromised).
-  template <class SeedSequence>
-  void reseed(SeedSequence& seq) {
-    using sequence_result_type = typename SeedSequence::result_type;
-    static_assert(sizeof(sequence_result_type) == 4,
-                  "SeedSequence::result_type must be 32-bit");
-
-    constexpr size_t kBufferSize =
-        Randen::kSeedBytes / sizeof(sequence_result_type);
-    alignas(16) sequence_result_type buffer[kBufferSize];
-
-    // Randen::Absorb XORs the seed into state, which is then mixed by a call
-    // to Randen::Generate. Seeding with only the provided entropy is preferred
-    // to using an arbitrary generate() call, so use [rand.req.seed_seq]
-    // size as a proxy for the number of entropy units that can be generated
-    // without relying on seed sequence mixing...
-    const size_t entropy_size = seq.size();
-    if (entropy_size < kBufferSize) {
-      // ... and only request that many values, or 256-bits, when unspecified.
-      const size_t requested_entropy = (entropy_size == 0) ? 8u : entropy_size;
-      std::fill(std::begin(buffer) + requested_entropy, std::end(buffer), 0);
-      seq.generate(std::begin(buffer), std::begin(buffer) + requested_entropy);
-      // The Randen paper suggests preferentially initializing even-numbered
-      // 128-bit vectors of the randen state (there are 16 such vectors).
-      // The seed data is merged into the state offset by 128-bits, which
-      // implies prefering seed bytes [16..31, ..., 208..223]. Since the
-      // buffer is 32-bit values, we swap the corresponding buffer positions in
-      // 128-bit chunks.
-      size_t dst = kBufferSize;
-      while (dst > 7) {
-        // leave the odd bucket as-is.
-        dst -= 4;
-        size_t src = dst >> 1;
-        // swap 128-bits into the even bucket
-        std::swap(buffer[--dst], buffer[--src]);
-        std::swap(buffer[--dst], buffer[--src]);
-        std::swap(buffer[--dst], buffer[--src]);
-        std::swap(buffer[--dst], buffer[--src]);
-      }
-    } else {
-      seq.generate(std::begin(buffer), std::end(buffer));
-    }
-    impl_.Absorb(buffer, state_);
-
-    // Generate will be called when operator() is called
-    next_ = kStateSizeT;
-  }
-
-  void discard(uint64_t count) {
-    uint64_t step = std::min<uint64_t>(kStateSizeT - next_, count);
-    count -= step;
-
-    constexpr uint64_t kRateT = kStateSizeT - kCapacityT;
-    while (count > 0) {
-      next_ = kCapacityT;
-      impl_.Generate(state_);
-      step = std::min<uint64_t>(kRateT, count);
-      count -= step;
-    }
-    next_ += step;
-  }
-
-  bool operator==(const randen_engine& other) const {
-    return next_ == other.next_ &&
-           std::equal(std::begin(state_), std::end(state_),
-                      std::begin(other.state_));
-  }
-
-  bool operator!=(const randen_engine& other) const {
-    return !(*this == other);
-  }
-
-  template <class CharT, class Traits>
-  friend std::basic_ostream<CharT, Traits>& operator<<(
-      std::basic_ostream<CharT, Traits>& os,  // NOLINT(runtime/references)
-      const randen_engine<T>& engine) {       // NOLINT(runtime/references)
-    using numeric_type =
-        typename random_internal::stream_format_type<result_type>::type;
-    auto saver = random_internal::make_ostream_state_saver(os);
-    for (const auto& elem : engine.state_) {
-      // In the case that `elem` is `uint8_t`, it must be cast to something
-      // larger so that it prints as an integer rather than a character. For
-      // simplicity, apply the cast all circumstances.
-      os << static_cast<numeric_type>(elem) << os.fill();
-    }
-    os << engine.next_;
-    return os;
-  }
-
-  template <class CharT, class Traits>
-  friend std::basic_istream<CharT, Traits>& operator>>(
-      std::basic_istream<CharT, Traits>& is,  // NOLINT(runtime/references)
-      randen_engine<T>& engine) {             // NOLINT(runtime/references)
-    using numeric_type =
-        typename random_internal::stream_format_type<result_type>::type;
-    result_type state[kStateSizeT];
-    size_t next;
-    for (auto& elem : state) {
-      // It is not possible to read uint8_t from wide streams, so it is
-      // necessary to read a wider type and then cast it to uint8_t.
-      numeric_type value;
-      is >> value;
-      elem = static_cast<result_type>(value);
-    }
-    is >> next;
-    if (is.fail()) {
-      return is;
-    }
-    std::memcpy(engine.state_, state, sizeof(engine.state_));
-    engine.next_ = next;
-    return is;
-  }
-
- private:
-  static constexpr size_t kStateSizeT =
-      Randen::kStateBytes / sizeof(result_type);
-  static constexpr size_t kCapacityT =
-      Randen::kCapacityBytes / sizeof(result_type);
-
-  // First kCapacityT are `inner', the others are accessible random bits.
-  alignas(16) result_type state_[kStateSizeT];
-  size_t next_;  // index within state_
-  Randen impl_;
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_RANDEN_ENGINE_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_engine_test.cc b/third_party/abseil_cpp/absl/random/internal/randen_engine_test.cc
deleted file mode 100644
index c8e7685bddad..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_engine_test.cc
+++ /dev/null
@@ -1,656 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/randen_engine.h"
-
-#include <algorithm>
-#include <bitset>
-#include <random>
-#include <sstream>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/random/internal/explicit_seed_seq.h"
-#include "absl/strings/str_cat.h"
-#include "absl/time/clock.h"
-
-#define UPDATE_GOLDEN 0
-
-using randen_u64 = absl::random_internal::randen_engine<uint64_t>;
-using randen_u32 = absl::random_internal::randen_engine<uint32_t>;
-using absl::random_internal::ExplicitSeedSeq;
-
-namespace {
-
-template <typename UIntType>
-class RandenEngineTypedTest : public ::testing::Test {};
-
-using UIntTypes = ::testing::Types<uint8_t, uint16_t, uint32_t, uint64_t>;
-
-TYPED_TEST_SUITE(RandenEngineTypedTest, UIntTypes);
-
-TYPED_TEST(RandenEngineTypedTest, VerifyReseedChangesAllValues) {
-  using randen = typename absl::random_internal::randen_engine<TypeParam>;
-  using result_type = typename randen::result_type;
-
-  const size_t kNumOutputs = (sizeof(randen) * 2 / sizeof(TypeParam)) + 1;
-  randen engine;
-
-  // MSVC emits error 2719 without the use of std::ref below.
-  //  * formal parameter with __declspec(align('#')) won't be aligned
-
-  {
-    std::seed_seq seq1{1, 2, 3, 4, 5, 6, 7};
-    engine.seed(seq1);
-  }
-  result_type a[kNumOutputs];
-  std::generate(std::begin(a), std::end(a), std::ref(engine));
-
-  {
-    std::random_device rd;
-    std::seed_seq seq2{rd(), rd(), rd()};
-    engine.seed(seq2);
-  }
-  result_type b[kNumOutputs];
-  std::generate(std::begin(b), std::end(b), std::ref(engine));
-
-  // Test that generated sequence changed as sequence of bits, i.e. if about
-  // half of the bites were flipped between two non-correlated values.
-  size_t changed_bits = 0;
-  size_t unchanged_bits = 0;
-  size_t total_set = 0;
-  size_t total_bits = 0;
-  size_t equal_count = 0;
-  for (size_t i = 0; i < kNumOutputs; ++i) {
-    equal_count += (a[i] == b[i]) ? 1 : 0;
-    std::bitset<sizeof(result_type) * 8> bitset(a[i] ^ b[i]);
-    changed_bits += bitset.count();
-    unchanged_bits += bitset.size() - bitset.count();
-
-    std::bitset<sizeof(result_type) * 8> a_set(a[i]);
-    std::bitset<sizeof(result_type) * 8> b_set(b[i]);
-    total_set += a_set.count() + b_set.count();
-    total_bits += 2 * 8 * sizeof(result_type);
-  }
-  // On average, half the bits are changed between two calls.
-  EXPECT_LE(changed_bits, 0.60 * (changed_bits + unchanged_bits));
-  EXPECT_GE(changed_bits, 0.40 * (changed_bits + unchanged_bits));
-
-  // Verify using a quick normal-approximation to the binomial.
-  EXPECT_NEAR(total_set, total_bits * 0.5, 4 * std::sqrt(total_bits))
-      << "@" << total_set / static_cast<double>(total_bits);
-
-  // Also, A[i] == B[i] with probability (1/range) * N.
-  // Give this a pretty wide latitude, though.
-  const double kExpected = kNumOutputs / (1.0 * sizeof(result_type) * 8);
-  EXPECT_LE(equal_count, 1.0 + kExpected);
-}
-
-// Number of values that needs to be consumed to clean two sizes of buffer
-// and trigger third refresh. (slightly overestimates the actual state size).
-constexpr size_t kTwoBufferValues = sizeof(randen_u64) / sizeof(uint16_t) + 1;
-
-TYPED_TEST(RandenEngineTypedTest, VerifyDiscard) {
-  using randen = typename absl::random_internal::randen_engine<TypeParam>;
-
-  for (size_t num_used = 0; num_used < kTwoBufferValues; ++num_used) {
-    randen engine_used;
-    for (size_t i = 0; i < num_used; ++i) {
-      engine_used();
-    }
-
-    for (size_t num_discard = 0; num_discard < kTwoBufferValues;
-         ++num_discard) {
-      randen engine1 = engine_used;
-      randen engine2 = engine_used;
-      for (size_t i = 0; i < num_discard; ++i) {
-        engine1();
-      }
-      engine2.discard(num_discard);
-      for (size_t i = 0; i < kTwoBufferValues; ++i) {
-        const auto r1 = engine1();
-        const auto r2 = engine2();
-        ASSERT_EQ(r1, r2) << "used=" << num_used << " discard=" << num_discard;
-      }
-    }
-  }
-}
-
-TYPED_TEST(RandenEngineTypedTest, StreamOperatorsResult) {
-  using randen = typename absl::random_internal::randen_engine<TypeParam>;
-  std::wostringstream os;
-  std::wistringstream is;
-  randen engine;
-
-  EXPECT_EQ(&(os << engine), &os);
-  EXPECT_EQ(&(is >> engine), &is);
-}
-
-TYPED_TEST(RandenEngineTypedTest, StreamSerialization) {
-  using randen = typename absl::random_internal::randen_engine<TypeParam>;
-
-  for (size_t discard = 0; discard < kTwoBufferValues; ++discard) {
-    ExplicitSeedSeq seed_sequence{12, 34, 56};
-    randen engine(seed_sequence);
-    engine.discard(discard);
-
-    std::stringstream stream;
-    stream << engine;
-
-    randen new_engine;
-    stream >> new_engine;
-    for (size_t i = 0; i < 64; ++i) {
-      EXPECT_EQ(engine(), new_engine()) << " " << i;
-    }
-  }
-}
-
-constexpr size_t kNumGoldenOutputs = 127;
-
-// This test is checking if randen_engine is meets interface requirements
-// defined in [rand.req.urbg].
-TYPED_TEST(RandenEngineTypedTest, RandomNumberEngineInterface) {
-  using randen = typename absl::random_internal::randen_engine<TypeParam>;
-
-  using E = randen;
-  using T = typename E::result_type;
-
-  static_assert(std::is_copy_constructible<E>::value,
-                "randen_engine must be copy constructible");
-
-  static_assert(absl::is_copy_assignable<E>::value,
-                "randen_engine must be copy assignable");
-
-  static_assert(std::is_move_constructible<E>::value,
-                "randen_engine must be move constructible");
-
-  static_assert(absl::is_move_assignable<E>::value,
-                "randen_engine must be move assignable");
-
-  static_assert(std::is_same<decltype(std::declval<E>()()), T>::value,
-                "return type of operator() must be result_type");
-
-  // Names after definition of [rand.req.urbg] in C++ standard.
-  // e us a value of E
-  // v is a lvalue of E
-  // x, y are possibly const values of E
-  // s is a value of T
-  // q is a value satisfying requirements of seed_sequence
-  // z is a value of type unsigned long long
-  // os is a some specialization of basic_ostream
-  // is is a some specialization of basic_istream
-
-  E e, v;
-  const E x, y;
-  T s = 1;
-  std::seed_seq q{1, 2, 3};
-  unsigned long long z = 1;  // NOLINT(runtime/int)
-  std::wostringstream os;
-  std::wistringstream is;
-
-  E{};
-  E{x};
-  E{s};
-  E{q};
-
-  e.seed();
-
-  // MSVC emits error 2718 when using EXPECT_EQ(e, x)
-  //  * actual parameter with __declspec(align('#')) won't be aligned
-  EXPECT_TRUE(e == x);
-
-  e.seed(q);
-  {
-    E tmp(q);
-    EXPECT_TRUE(e == tmp);
-  }
-
-  e();
-  {
-    E tmp(q);
-    EXPECT_TRUE(e != tmp);
-  }
-
-  e.discard(z);
-
-  static_assert(std::is_same<decltype(x == y), bool>::value,
-                "return type of operator== must be bool");
-
-  static_assert(std::is_same<decltype(x != y), bool>::value,
-                "return type of operator== must be bool");
-}
-
-TYPED_TEST(RandenEngineTypedTest, RandenEngineSFINAETest) {
-  using randen = typename absl::random_internal::randen_engine<TypeParam>;
-  using result_type = typename randen::result_type;
-
-  {
-    randen engine(result_type(1));
-    engine.seed(result_type(1));
-  }
-
-  {
-    result_type n = 1;
-    randen engine(n);
-    engine.seed(n);
-  }
-
-  {
-    randen engine(1);
-    engine.seed(1);
-  }
-
-  {
-    int n = 1;
-    randen engine(n);
-    engine.seed(n);
-  }
-
-  {
-    std::seed_seq seed_seq;
-    randen engine(seed_seq);
-    engine.seed(seed_seq);
-  }
-
-  {
-    randen engine{std::seed_seq()};
-    engine.seed(std::seed_seq());
-  }
-}
-
-TEST(RandenTest, VerifyGoldenRanden64Default) {
-  constexpr uint64_t kGolden[kNumGoldenOutputs] = {
-      0xc3c14f134e433977, 0xdda9f47cd90410ee, 0x887bf3087fd8ca10,
-      0xf0b780f545c72912, 0x15dbb1d37696599f, 0x30ec63baff3c6d59,
-      0xb29f73606f7f20a6, 0x02808a316f49a54c, 0x3b8feaf9d5c8e50e,
-      0x9cbf605e3fd9de8a, 0xc970ae1a78183bbb, 0xd8b2ffd356301ed5,
-      0xf4b327fe0fc73c37, 0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d,
-      0xd5af05dd3eff9556, 0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c,
-      0x58d3575834956d42, 0xed1ef4c26b87b840, 0x8eef32a23e0b2df3,
-      0x497cabf3431154fc, 0x4e24370570029a8b, 0xd88b5749f090e5ea,
-      0xc651a582a970692f, 0x78fcec2cbb6342f5, 0x463cb745612f55db,
-      0x352ee4ad1816afe3, 0x026ff374c101da7e, 0x811ef0821c3de851,
-      0x6f7e616704c4fa59, 0xa0660379992d58fc, 0x04b0a374a3b795c7,
-      0x915f3445685da798, 0x26802a8ac76571ce, 0x4663352533ce1882,
-      0xb9fdefb4a24dc738, 0x5588ba3a4d6e6c51, 0xa2101a42d35f1956,
-      0x607195a5e200f5fd, 0x7e100308f3290764, 0xe1e5e03c759c0709,
-      0x082572cc5da6606f, 0xcbcf585399e432f1, 0xe8a2be4f8335d8f1,
-      0x0904469acbfee8f2, 0xf08bd31b6daecd51, 0x08e8a1f1a69da69a,
-      0x6542a20aad57bff5, 0x2e9705bb053d6b46, 0xda2fc9db0713c391,
-      0x78e3a810213b6ffb, 0xdc16a59cdd85f8a6, 0xc0932718cd55781f,
-      0xb9bfb29c2b20bfe5, 0xb97289c1be0f2f9c, 0xc0a2a0e403a892d4,
-      0x5524bb834771435b, 0x8265da3d39d1a750, 0xff4af3ab8d1b78c5,
-      0xf0ec5f424bcad77f, 0x66e455f627495189, 0xc82d3120b57e3270,
-      0x3424e47dc22596e3, 0xbc0c95129ccedcdd, 0xc191c595afc4dcbf,
-      0x120392bd2bb70939, 0x7f90650ea6cd6ab4, 0x7287491832695ad3,
-      0xa7c8fac5a7917eb0, 0xd088cb9418be0361, 0x7c1bf9839c7c1ce5,
-      0xe2e991fa58e1e79e, 0x78565cdefd28c4ad, 0x7351b9fef98bafad,
-      0x2a9eac28b08c96bf, 0x6c4f179696cb2225, 0x13a685861bab87e0,
-      0x64c6de5aa0501971, 0x30537425cac70991, 0x01590d9dc6c532b7,
-      0x7e05e3aa8ec720dc, 0x74a07d9c54e3e63f, 0x738184388f3bc1d2,
-      0x26ffdc5067be3acb, 0x6bcdf185561f255f, 0xa0eaf2e1cf99b1c6,
-      0x171df81934f68604, 0x7ea5a21665683e5a, 0x5d1cb02075ba1cea,
-      0x957f38cbd2123fdf, 0xba6364eff80de02f, 0x606e0a0e41d452ee,
-      0x892d8317de82f7a2, 0xe707b1db50f7b43e, 0x4eb28826766fcf5b,
-      0x5a362d56e80a0951, 0x6ee217df16527d78, 0xf6737962ba6b23dd,
-      0x443e63857d4076ca, 0x790d9a5f048adfeb, 0xd796b052151ee94d,
-      0x033ed95c12b04a03, 0x8b833ff84893da5d, 0x3d6724b1bb15eab9,
-      0x9877c4225061ca76, 0xd68d6810adf74fb3, 0x42e5352fe30ce989,
-      0x265b565a7431fde7, 0x3cdbf7e358df4b8b, 0x2922a47f6d3e8779,
-      0x52d2242f65b37f88, 0x5d836d6e2958d6b5, 0x29d40f00566d5e26,
-      0x288db0e1124b14a0, 0x6c056608b7d9c1b6, 0x0b9471bdb8f19d32,
-      0x8fb946504faa6c9d, 0x8943a9464540251c, 0xfd1fe27d144a09e0,
-      0xea6ac458da141bda, 0x8048f217633fce36, 0xfeda1384ade74d31,
-      0x4334b8b02ff7612f, 0xdbc8441f5227e216, 0x096d119a3605c85b,
-      0x2b72b31c21b7d7d0};
-
-  randen_u64 engine;
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%016lx, ", engine());
-    if (i % 3 == 2) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed();
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(RandenTest, VerifyGoldenRanden64Seeded) {
-  constexpr uint64_t kGolden[kNumGoldenOutputs] = {
-      0x83a9e58f94d3dcd5, 0x70bbdff3d97949fb, 0x0438481f7471c1b4,
-      0x34fdc58ee5fb5930, 0xceee4f2d2a937d17, 0xb5a26a68e432aea9,
-      0x8b64774a3fb51740, 0xd89ac1fc74249c74, 0x03910d1d23fc3fdf,
-      0xd38f630878aa897f, 0x0ee8f0f5615f7e44, 0x98f5a53df8279d52,
-      0xb403f52c25938d0e, 0x240072996ea6e838, 0xd3a791246190fa61,
-      0xaaedd3df7a7b4f80, 0xc6eacabe05deaf6e, 0xb7967dd8790edf4d,
-      0x9a0a8e67e049d279, 0x0494f606aebc23e7, 0x598dcd687bc3e0ee,
-      0x010ac81802d452a1, 0x6407c87160aa2842, 0x5a56e276486f93a0,
-      0xc887a399d46a8f02, 0x9e1e6100fe93b740, 0x12d02e330f8901f6,
-      0xc39ca52b47e790b7, 0xb0b0a2fa11e82e61, 0x1542d841a303806a,
-      0x1fe659fd7d6e9d86, 0xb8c90d80746541ac, 0x239d56a5669ddc94,
-      0xd40db57c8123d13c, 0x3abc2414153a0db0, 0x9bad665630cb8d61,
-      0x0bd1fb90ee3f4bbc, 0x8f0b4d7e079b4e42, 0xfa0fb0e0ee59e793,
-      0x51080b283e071100, 0x2c4b9e715081cc15, 0xbe10ed49de4941df,
-      0xf8eaac9d4b1b0d37, 0x4bcce4b54605e139, 0xa64722b76765dda6,
-      0xb9377d738ca28ab5, 0x779fad81a8ccc1af, 0x65cb3ee61ffd3ba7,
-      0xd74e79087862836f, 0xd05b9c584c3f25bf, 0x2ba93a4693579827,
-      0xd81530aff05420ce, 0xec06cea215478621, 0x4b1798a6796d65ad,
-      0xf142f3fb3a6f6fa6, 0x002b7bf7e237b560, 0xf47f2605ef65b4f8,
-      0x9804ec5517effc18, 0xaed3d7f8b7d481cd, 0x5651c24c1ce338d1,
-      0x3e7a38208bf0a3c6, 0x6796a7b614534aed, 0x0d0f3b848358460f,
-      0x0fa5fe7600b19524, 0x2b0cf38253faaedc, 0x10df9188233a9fd6,
-      0x3a10033880138b59, 0x5fb0b0d23948e80f, 0x9e76f7b02fbf5350,
-      0x0816052304b1a985, 0x30c9880db41fd218, 0x14aa399b65e20f28,
-      0xe1454a8cace787b4, 0x325ac971b6c6f0f5, 0x716b1aa2784f3d36,
-      0x3d5ce14accfd144f, 0x6c0c97710f651792, 0xbc5b0f59fb333532,
-      0x2a90a7d2140470bc, 0x8da269f55c1e1c8d, 0xcfc37143895792ca,
-      0xbe21eab1f30b238f, 0x8c47229dee4d65fd, 0x5743614ed1ed7d54,
-      0x351372a99e9c476e, 0x2bd5ea15e5db085f, 0x6925fde46e0af4ca,
-      0xed3eda2bdc1f45bd, 0xdef68c68d460fa6e, 0xe42a0de76253e2b5,
-      0x4e5176dcbc29c305, 0xbfd85fba9f810f6e, 0x76a5a2a9beb815c6,
-      0x01edc4ddceaf414c, 0xa4e98904b4bb3b4b, 0x00bd63ac7d2f1ddd,
-      0xb8491fe6e998ddbb, 0xb386a3463dda6800, 0x0081887688871619,
-      0x33d394b3344e9a38, 0x815dba65a3a8baf9, 0x4232f6ec02c2fd1a,
-      0xb5cff603edd20834, 0x580189243f687663, 0xa8d5a2cbdc27fe99,
-      0x725d881693fa0131, 0xa2be2c13db2c7ac5, 0x7b6a9614b509fd78,
-      0xb6b136d71e717636, 0x660f1a71aff046ea, 0x0ba10ae346c8ec9e,
-      0xe66dde53e3145b41, 0x3b18288c88c26be6, 0x4d9d9d2ff02db933,
-      0x4167da8c70f46e8a, 0xf183beef8c6318b4, 0x4d889e1e71eeeef1,
-      0x7175c71ad6689b6b, 0xfb9e42beacd1b7dd, 0xc33d0e91b29b5e0d,
-      0xd39b83291ce47922, 0xc4d570fb8493d12e, 0x23d5a5724f424ae6,
-      0x5245f161876b6616, 0x38d77dbd21ab578d, 0x9c3423311f4ecbfe,
-      0x76fe31389bacd9d5,
-  };
-
-  ExplicitSeedSeq seed_sequence{12, 34, 56};
-  randen_u64 engine(seed_sequence);
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%016lx, ", engine());
-    if (i % 3 == 2) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed(seed_sequence);
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(RandenTest, VerifyGoldenRanden32Default) {
-  constexpr uint64_t kGolden[2 * kNumGoldenOutputs] = {
-      0x4e433977, 0xc3c14f13, 0xd90410ee, 0xdda9f47c, 0x7fd8ca10, 0x887bf308,
-      0x45c72912, 0xf0b780f5, 0x7696599f, 0x15dbb1d3, 0xff3c6d59, 0x30ec63ba,
-      0x6f7f20a6, 0xb29f7360, 0x6f49a54c, 0x02808a31, 0xd5c8e50e, 0x3b8feaf9,
-      0x3fd9de8a, 0x9cbf605e, 0x78183bbb, 0xc970ae1a, 0x56301ed5, 0xd8b2ffd3,
-      0x0fc73c37, 0xf4b327fe, 0xeb8f9a19, 0xcdfd8d76, 0x91420c9d, 0xc3a506eb,
-      0x3eff9556, 0xd5af05dd, 0x8f83c4a1, 0x48db1bb7, 0x0d6bfe8c, 0x7023920e,
-      0x34956d42, 0x58d35758, 0x6b87b840, 0xed1ef4c2, 0x3e0b2df3, 0x8eef32a2,
-      0x431154fc, 0x497cabf3, 0x70029a8b, 0x4e243705, 0xf090e5ea, 0xd88b5749,
-      0xa970692f, 0xc651a582, 0xbb6342f5, 0x78fcec2c, 0x612f55db, 0x463cb745,
-      0x1816afe3, 0x352ee4ad, 0xc101da7e, 0x026ff374, 0x1c3de851, 0x811ef082,
-      0x04c4fa59, 0x6f7e6167, 0x992d58fc, 0xa0660379, 0xa3b795c7, 0x04b0a374,
-      0x685da798, 0x915f3445, 0xc76571ce, 0x26802a8a, 0x33ce1882, 0x46633525,
-      0xa24dc738, 0xb9fdefb4, 0x4d6e6c51, 0x5588ba3a, 0xd35f1956, 0xa2101a42,
-      0xe200f5fd, 0x607195a5, 0xf3290764, 0x7e100308, 0x759c0709, 0xe1e5e03c,
-      0x5da6606f, 0x082572cc, 0x99e432f1, 0xcbcf5853, 0x8335d8f1, 0xe8a2be4f,
-      0xcbfee8f2, 0x0904469a, 0x6daecd51, 0xf08bd31b, 0xa69da69a, 0x08e8a1f1,
-      0xad57bff5, 0x6542a20a, 0x053d6b46, 0x2e9705bb, 0x0713c391, 0xda2fc9db,
-      0x213b6ffb, 0x78e3a810, 0xdd85f8a6, 0xdc16a59c, 0xcd55781f, 0xc0932718,
-      0x2b20bfe5, 0xb9bfb29c, 0xbe0f2f9c, 0xb97289c1, 0x03a892d4, 0xc0a2a0e4,
-      0x4771435b, 0x5524bb83, 0x39d1a750, 0x8265da3d, 0x8d1b78c5, 0xff4af3ab,
-      0x4bcad77f, 0xf0ec5f42, 0x27495189, 0x66e455f6, 0xb57e3270, 0xc82d3120,
-      0xc22596e3, 0x3424e47d, 0x9ccedcdd, 0xbc0c9512, 0xafc4dcbf, 0xc191c595,
-      0x2bb70939, 0x120392bd, 0xa6cd6ab4, 0x7f90650e, 0x32695ad3, 0x72874918,
-      0xa7917eb0, 0xa7c8fac5, 0x18be0361, 0xd088cb94, 0x9c7c1ce5, 0x7c1bf983,
-      0x58e1e79e, 0xe2e991fa, 0xfd28c4ad, 0x78565cde, 0xf98bafad, 0x7351b9fe,
-      0xb08c96bf, 0x2a9eac28, 0x96cb2225, 0x6c4f1796, 0x1bab87e0, 0x13a68586,
-      0xa0501971, 0x64c6de5a, 0xcac70991, 0x30537425, 0xc6c532b7, 0x01590d9d,
-      0x8ec720dc, 0x7e05e3aa, 0x54e3e63f, 0x74a07d9c, 0x8f3bc1d2, 0x73818438,
-      0x67be3acb, 0x26ffdc50, 0x561f255f, 0x6bcdf185, 0xcf99b1c6, 0xa0eaf2e1,
-      0x34f68604, 0x171df819, 0x65683e5a, 0x7ea5a216, 0x75ba1cea, 0x5d1cb020,
-      0xd2123fdf, 0x957f38cb, 0xf80de02f, 0xba6364ef, 0x41d452ee, 0x606e0a0e,
-      0xde82f7a2, 0x892d8317, 0x50f7b43e, 0xe707b1db, 0x766fcf5b, 0x4eb28826,
-      0xe80a0951, 0x5a362d56, 0x16527d78, 0x6ee217df, 0xba6b23dd, 0xf6737962,
-      0x7d4076ca, 0x443e6385, 0x048adfeb, 0x790d9a5f, 0x151ee94d, 0xd796b052,
-      0x12b04a03, 0x033ed95c, 0x4893da5d, 0x8b833ff8, 0xbb15eab9, 0x3d6724b1,
-      0x5061ca76, 0x9877c422, 0xadf74fb3, 0xd68d6810, 0xe30ce989, 0x42e5352f,
-      0x7431fde7, 0x265b565a, 0x58df4b8b, 0x3cdbf7e3, 0x6d3e8779, 0x2922a47f,
-      0x65b37f88, 0x52d2242f, 0x2958d6b5, 0x5d836d6e, 0x566d5e26, 0x29d40f00,
-      0x124b14a0, 0x288db0e1, 0xb7d9c1b6, 0x6c056608, 0xb8f19d32, 0x0b9471bd,
-      0x4faa6c9d, 0x8fb94650, 0x4540251c, 0x8943a946, 0x144a09e0, 0xfd1fe27d,
-      0xda141bda, 0xea6ac458, 0x633fce36, 0x8048f217, 0xade74d31, 0xfeda1384,
-      0x2ff7612f, 0x4334b8b0, 0x5227e216, 0xdbc8441f, 0x3605c85b, 0x096d119a,
-      0x21b7d7d0, 0x2b72b31c};
-
-  randen_u32 engine;
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < 2 * kNumGoldenOutputs; ++i) {
-    printf("0x%08x, ", engine());
-    if (i % 6 == 5) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed();
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(RandenTest, VerifyGoldenRanden32Seeded) {
-  constexpr uint64_t kGolden[2 * kNumGoldenOutputs] = {
-      0x94d3dcd5, 0x83a9e58f, 0xd97949fb, 0x70bbdff3, 0x7471c1b4, 0x0438481f,
-      0xe5fb5930, 0x34fdc58e, 0x2a937d17, 0xceee4f2d, 0xe432aea9, 0xb5a26a68,
-      0x3fb51740, 0x8b64774a, 0x74249c74, 0xd89ac1fc, 0x23fc3fdf, 0x03910d1d,
-      0x78aa897f, 0xd38f6308, 0x615f7e44, 0x0ee8f0f5, 0xf8279d52, 0x98f5a53d,
-      0x25938d0e, 0xb403f52c, 0x6ea6e838, 0x24007299, 0x6190fa61, 0xd3a79124,
-      0x7a7b4f80, 0xaaedd3df, 0x05deaf6e, 0xc6eacabe, 0x790edf4d, 0xb7967dd8,
-      0xe049d279, 0x9a0a8e67, 0xaebc23e7, 0x0494f606, 0x7bc3e0ee, 0x598dcd68,
-      0x02d452a1, 0x010ac818, 0x60aa2842, 0x6407c871, 0x486f93a0, 0x5a56e276,
-      0xd46a8f02, 0xc887a399, 0xfe93b740, 0x9e1e6100, 0x0f8901f6, 0x12d02e33,
-      0x47e790b7, 0xc39ca52b, 0x11e82e61, 0xb0b0a2fa, 0xa303806a, 0x1542d841,
-      0x7d6e9d86, 0x1fe659fd, 0x746541ac, 0xb8c90d80, 0x669ddc94, 0x239d56a5,
-      0x8123d13c, 0xd40db57c, 0x153a0db0, 0x3abc2414, 0x30cb8d61, 0x9bad6656,
-      0xee3f4bbc, 0x0bd1fb90, 0x079b4e42, 0x8f0b4d7e, 0xee59e793, 0xfa0fb0e0,
-      0x3e071100, 0x51080b28, 0x5081cc15, 0x2c4b9e71, 0xde4941df, 0xbe10ed49,
-      0x4b1b0d37, 0xf8eaac9d, 0x4605e139, 0x4bcce4b5, 0x6765dda6, 0xa64722b7,
-      0x8ca28ab5, 0xb9377d73, 0xa8ccc1af, 0x779fad81, 0x1ffd3ba7, 0x65cb3ee6,
-      0x7862836f, 0xd74e7908, 0x4c3f25bf, 0xd05b9c58, 0x93579827, 0x2ba93a46,
-      0xf05420ce, 0xd81530af, 0x15478621, 0xec06cea2, 0x796d65ad, 0x4b1798a6,
-      0x3a6f6fa6, 0xf142f3fb, 0xe237b560, 0x002b7bf7, 0xef65b4f8, 0xf47f2605,
-      0x17effc18, 0x9804ec55, 0xb7d481cd, 0xaed3d7f8, 0x1ce338d1, 0x5651c24c,
-      0x8bf0a3c6, 0x3e7a3820, 0x14534aed, 0x6796a7b6, 0x8358460f, 0x0d0f3b84,
-      0x00b19524, 0x0fa5fe76, 0x53faaedc, 0x2b0cf382, 0x233a9fd6, 0x10df9188,
-      0x80138b59, 0x3a100338, 0x3948e80f, 0x5fb0b0d2, 0x2fbf5350, 0x9e76f7b0,
-      0x04b1a985, 0x08160523, 0xb41fd218, 0x30c9880d, 0x65e20f28, 0x14aa399b,
-      0xace787b4, 0xe1454a8c, 0xb6c6f0f5, 0x325ac971, 0x784f3d36, 0x716b1aa2,
-      0xccfd144f, 0x3d5ce14a, 0x0f651792, 0x6c0c9771, 0xfb333532, 0xbc5b0f59,
-      0x140470bc, 0x2a90a7d2, 0x5c1e1c8d, 0x8da269f5, 0x895792ca, 0xcfc37143,
-      0xf30b238f, 0xbe21eab1, 0xee4d65fd, 0x8c47229d, 0xd1ed7d54, 0x5743614e,
-      0x9e9c476e, 0x351372a9, 0xe5db085f, 0x2bd5ea15, 0x6e0af4ca, 0x6925fde4,
-      0xdc1f45bd, 0xed3eda2b, 0xd460fa6e, 0xdef68c68, 0x6253e2b5, 0xe42a0de7,
-      0xbc29c305, 0x4e5176dc, 0x9f810f6e, 0xbfd85fba, 0xbeb815c6, 0x76a5a2a9,
-      0xceaf414c, 0x01edc4dd, 0xb4bb3b4b, 0xa4e98904, 0x7d2f1ddd, 0x00bd63ac,
-      0xe998ddbb, 0xb8491fe6, 0x3dda6800, 0xb386a346, 0x88871619, 0x00818876,
-      0x344e9a38, 0x33d394b3, 0xa3a8baf9, 0x815dba65, 0x02c2fd1a, 0x4232f6ec,
-      0xedd20834, 0xb5cff603, 0x3f687663, 0x58018924, 0xdc27fe99, 0xa8d5a2cb,
-      0x93fa0131, 0x725d8816, 0xdb2c7ac5, 0xa2be2c13, 0xb509fd78, 0x7b6a9614,
-      0x1e717636, 0xb6b136d7, 0xaff046ea, 0x660f1a71, 0x46c8ec9e, 0x0ba10ae3,
-      0xe3145b41, 0xe66dde53, 0x88c26be6, 0x3b18288c, 0xf02db933, 0x4d9d9d2f,
-      0x70f46e8a, 0x4167da8c, 0x8c6318b4, 0xf183beef, 0x71eeeef1, 0x4d889e1e,
-      0xd6689b6b, 0x7175c71a, 0xacd1b7dd, 0xfb9e42be, 0xb29b5e0d, 0xc33d0e91,
-      0x1ce47922, 0xd39b8329, 0x8493d12e, 0xc4d570fb, 0x4f424ae6, 0x23d5a572,
-      0x876b6616, 0x5245f161, 0x21ab578d, 0x38d77dbd, 0x1f4ecbfe, 0x9c342331,
-      0x9bacd9d5, 0x76fe3138,
-  };
-
-  ExplicitSeedSeq seed_sequence{12, 34, 56};
-  randen_u32 engine(seed_sequence);
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  for (size_t i = 0; i < 2 * kNumGoldenOutputs; ++i) {
-    printf("0x%08x, ", engine());
-    if (i % 6 == 5) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-  engine.seed(seed_sequence);
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(RandenTest, VerifyGoldenFromDeserializedEngine) {
-  constexpr uint64_t kGolden[kNumGoldenOutputs] = {
-      0x067f9f9ab919657a, 0x0534605912988583, 0x8a303f72feaa673f,
-      0x77b7fd747909185c, 0xd9af90403c56d891, 0xd939c6cb204d14b5,
-      0x7fbe6b954a47b483, 0x8b31a47cc34c768d, 0x3a9e546da2701a9c,
-      0x5246539046253e71, 0x417191ffb2a848a1, 0x7b1c7bf5a5001d09,
-      0x9489b15d194f2361, 0xfcebdeea3bcd2461, 0xd643027c854cec97,
-      0x5885397f91e0d21c, 0x53173b0efae30d58, 0x1c9c71168449fac1,
-      0xe358202b711ed8aa, 0x94e3918ed1d8227c, 0x5bb4e251450144cf,
-      0xb5c7a519b489af3b, 0x6f8b560b1f7b3469, 0xfde11dd4a1c74eef,
-      0x33383d2f76457dcf, 0x3060c0ec6db9fce1, 0x18f451fcddeec766,
-      0xe73c5d6b9f26da2a, 0x8d4cc566671b32a4, 0xb8189b73776bc9ff,
-      0x497a70f9caf0bc23, 0x23afcc509791dcea, 0x18af70dc4b27d306,
-      0xd3853f955a0ce5b9, 0x441db6c01a0afb17, 0xd0136c3fb8e1f13f,
-      0x5e4fd6fc2f33783c, 0xe0d24548adb5da51, 0x0f4d8362a7d3485a,
-      0x9f572d68270fa563, 0x6351fbc823024393, 0xa66dbfc61810e9ab,
-      0x0ff17fc14b651af8, 0xd74c55dafb99e623, 0x36303bc1ad85c6c2,
-      0x4920cd6a2af7e897, 0x0b8848addc30fecd, 0x9e1562eda6488e93,
-      0x197553807d607828, 0xbef5eaeda5e21235, 0x18d91d2616aca527,
-      0xb7821937f5c873cd, 0x2cd4ae5650dbeefc, 0xb35a64376f75ffdf,
-      0x9226d414d647fe07, 0x663f3db455bbb35e, 0xa829eead6ae93247,
-      0x7fd69c204dd0d25f, 0xbe1411f891c9acb1, 0xd476f34a506d5f11,
-      0xf423d2831649c5ca, 0x1e503962951abd75, 0xeccc9e8b1e34b537,
-      0xb11a147294044854, 0xc4cf27f0abf4929d, 0xe9193abf6fa24c8c,
-      0xa94a259e3aba8808, 0x21dc414197deffa3, 0xa2ae211d1ff622ae,
-      0xfe3995c46be5a4f4, 0xe9984c284bf11128, 0xcb1ce9d2f0851a80,
-      0x42fee17971d87cd8, 0xac76a98d177adc88, 0xa0973b3dedc4af6f,
-      0xdf56d6bbcb1b8e86, 0xf1e6485f407b11c9, 0x2c63de4deccb15c0,
-      0x6fe69db32ed4fad7, 0xaa51a65f84bca1f1, 0x242f2ee81d608afc,
-      0x8eb88b2b69fc153b, 0x22c20098baf73fd1, 0x57759466f576488c,
-      0x075ca562cea1be9d, 0x9a74814d73d28891, 0x73d1555fc02f4d3d,
-      0xc17f8f210ee89337, 0x46cca7999eaeafd4, 0x5db8d6a327a0d8ac,
-      0xb79b4f93c738d7a1, 0x9994512f0036ded1, 0xd3883026f38747f4,
-      0xf31f7458078d097c, 0x736ce4d480680669, 0x7a496f4c7e1033e3,
-      0xecf85bf297fbc68c, 0x9e37e1d0f24f3c4e, 0x15b6e067ca0746fc,
-      0xdd4a39905c5db81c, 0xb5dfafa7bcfdf7da, 0xca6646fb6f92a276,
-      0x1c6b35f363ef0efd, 0x6a33d06037ad9f76, 0x45544241afd8f80f,
-      0x83f8d83f859c90c5, 0x22aea9c5365e8c19, 0xfac35b11f20b6a6a,
-      0xd1acf49d1a27dd2f, 0xf281cd09c4fed405, 0x076000a42cd38e4f,
-      0x6ace300565070445, 0x463a62781bddc4db, 0x1477126b46b569ac,
-      0x127f2bb15035fbb8, 0xdfa30946049c04a8, 0x89072a586ba8dd3e,
-      0x62c809582bb7e74d, 0x22c0c3641406c28b, 0x9b66e36c47ff004d,
-      0xb9cd2c7519653330, 0x18608d79cd7a598d, 0x92c0bd1323e53e32,
-      0x887ff00de8524aa5, 0xa074410b787abd10, 0x18ab41b8057a2063,
-      0x1560abf26bc5f987};
-
-#if UPDATE_GOLDEN
-  (void)kGolden;  // Silence warning.
-  std::seed_seq seed_sequence{1, 2, 3, 4, 5};
-  randen_u64 engine(seed_sequence);
-  std::ostringstream stream;
-  stream << engine;
-  auto str = stream.str();
-  printf("%s\n\n", str.c_str());
-  for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
-    printf("0x%016lx, ", engine());
-    if (i % 3 == 2) {
-      printf("\n");
-    }
-  }
-  printf("\n\n\n");
-#else
-  randen_u64 engine;
-  std::istringstream stream(
-      "0 0 9824501439887287479 3242284395352394785 243836530774933777 "
-      "4047941804708365596 17165468127298385802 949276103645889255 "
-      "10659970394998657921 1657570836810929787 11697746266668051452 "
-      "9967209969299905230 14140390331161524430 7383014124183271684 "
-      "13146719127702337852 13983155220295807171 11121125587542359264 "
-      "195757810993252695 17138580243103178492 11326030747260920501 "
-      "8585097322474965590 18342582839328350995 15052982824209724634 "
-      "7321861343874683609 1806786911778767826 10100850842665572955 "
-      "9249328950653985078 13600624835326909759 11137960060943860251 "
-      "10208781341792329629 9282723971471525577 16373271619486811032 32");
-  stream >> engine;
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, engine());
-  }
-#endif
-}
-
-TEST(RandenTest, IsFastOrSlow) {
-  // randen_engine typically costs ~5ns per value for the optimized code paths,
-  // and the ~1000ns per value for slow code paths.  However when running under
-  // msan, asan, etc. it can take much longer.
-  //
-  // The estimated operation time is something like:
-  //
-  // linux, optimized ~5ns
-  // ppc, optimized ~7ns
-  // nacl (slow), ~1100ns
-  //
-  // `kCount` is chosen below so that, in debug builds and without hardware
-  // acceleration, the test (assuming ~1us per call) should finish in ~0.1s
-  static constexpr size_t kCount = 100000;
-  randen_u64 engine;
-  randen_u64::result_type sum = 0;
-  auto start = absl::GetCurrentTimeNanos();
-  for (int i = 0; i < kCount; i++) {
-    sum += engine();
-  }
-  auto duration = absl::GetCurrentTimeNanos() - start;
-
-  ABSL_INTERNAL_LOG(INFO, absl::StrCat(static_cast<double>(duration) /
-                                           static_cast<double>(kCount),
-                                       "ns"));
-
-  EXPECT_GT(sum, 0);
-  EXPECT_GE(duration, kCount);  // Should be slower than 1ns per call.
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_hwaes.cc b/third_party/abseil_cpp/absl/random/internal/randen_hwaes.cc
deleted file mode 100644
index b5a3f90aee63..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_hwaes.cc
+++ /dev/null
@@ -1,573 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
-// symbols from arbitrary system and other headers, since it may be built
-// with different flags from other targets, using different levels of
-// optimization, potentially introducing ODR violations.
-
-#include "absl/random/internal/randen_hwaes.h"
-
-#include <cstdint>
-#include <cstring>
-
-#include "absl/base/attributes.h"
-#include "absl/random/internal/platform.h"
-#include "absl/random/internal/randen_traits.h"
-
-// ABSL_RANDEN_HWAES_IMPL indicates whether this file will contain
-// a hardware accelerated implementation of randen, or whether it
-// will contain stubs that exit the process.
-#if defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
-// The platform.h directives are sufficient to indicate whether
-// we should build accelerated implementations for x86.
-#if (ABSL_HAVE_ACCELERATED_AES || ABSL_RANDOM_INTERNAL_AES_DISPATCH)
-#define ABSL_RANDEN_HWAES_IMPL 1
-#endif
-#elif defined(ABSL_ARCH_PPC)
-// The platform.h directives are sufficient to indicate whether
-// we should build accelerated implementations for PPC.
-//
-// NOTE: This has mostly been tested on 64-bit Power variants,
-// and not embedded cpus such as powerpc32-8540
-#if ABSL_HAVE_ACCELERATED_AES
-#define ABSL_RANDEN_HWAES_IMPL 1
-#endif
-#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
-// ARM is somewhat more complicated. We might support crypto natively...
-#if ABSL_HAVE_ACCELERATED_AES || \
-    (defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO))
-#define ABSL_RANDEN_HWAES_IMPL 1
-
-#elif ABSL_RANDOM_INTERNAL_AES_DISPATCH && !defined(__APPLE__) && \
-    (defined(__GNUC__) && __GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ > 9)
-// ...or, on GCC, we can use an ASM directive to
-// instruct the assember to allow crypto instructions.
-#define ABSL_RANDEN_HWAES_IMPL 1
-#define ABSL_RANDEN_HWAES_IMPL_CRYPTO_DIRECTIVE 1
-#endif
-#else
-// HWAES is unsupported by these architectures / platforms:
-//   __myriad2__
-//   __mips__
-//
-// Other architectures / platforms are unknown.
-//
-// See the Abseil documentation on supported macros at:
-// https://abseil.io/docs/cpp/platforms/macros
-#endif
-
-#if !defined(ABSL_RANDEN_HWAES_IMPL)
-// No accelerated implementation is supported.
-// The RandenHwAes functions are stubs that print an error and exit.
-
-#include <cstdio>
-#include <cstdlib>
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// No accelerated implementation.
-bool HasRandenHwAesImplementation() { return false; }
-
-// NOLINTNEXTLINE
-const void* RandenHwAes::GetKeys() {
-  // Attempted to dispatch to an unsupported dispatch target.
-  const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
-  fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
-  exit(1);
-  return nullptr;
-}
-
-// NOLINTNEXTLINE
-void RandenHwAes::Absorb(const void*, void*) {
-  // Attempted to dispatch to an unsupported dispatch target.
-  const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
-  fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
-  exit(1);
-}
-
-// NOLINTNEXTLINE
-void RandenHwAes::Generate(const void*, void*) {
-  // Attempted to dispatch to an unsupported dispatch target.
-  const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
-  fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
-  exit(1);
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#else  // defined(ABSL_RANDEN_HWAES_IMPL)
-//
-// Accelerated implementations are supported.
-// We need the per-architecture includes and defines.
-//
-namespace {
-
-using absl::random_internal::RandenTraits;
-
-// Randen operates on 128-bit vectors.
-struct alignas(16) u64x2 {
-  uint64_t data[2];
-};
-
-}  // namespace
-
-// TARGET_CRYPTO defines a crypto attribute for each architecture.
-//
-// NOTE: Evaluate whether we should eliminate ABSL_TARGET_CRYPTO.
-#if (defined(__clang__) || defined(__GNUC__))
-#if defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
-#define ABSL_TARGET_CRYPTO __attribute__((target("aes")))
-#elif defined(ABSL_ARCH_PPC)
-#define ABSL_TARGET_CRYPTO __attribute__((target("crypto")))
-#else
-#define ABSL_TARGET_CRYPTO
-#endif
-#else
-#define ABSL_TARGET_CRYPTO
-#endif
-
-#if defined(ABSL_ARCH_PPC)
-// NOTE: Keep in mind that PPC can operate in little-endian or big-endian mode,
-// however the PPC altivec vector registers (and thus the AES instructions)
-// always operate in big-endian mode.
-
-#include <altivec.h>
-// <altivec.h> #defines vector __vector; in C++, this is bad form.
-#undef vector
-#undef bool
-
-// Rely on the PowerPC AltiVec vector operations for accelerated AES
-// instructions. GCC support of the PPC vector types is described in:
-// https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/PowerPC-AltiVec_002fVSX-Built-in-Functions.html
-//
-// Already provides operator^=.
-using Vector128 = __vector unsigned long long;  // NOLINT(runtime/int)
-
-namespace {
-inline ABSL_TARGET_CRYPTO Vector128 ReverseBytes(const Vector128& v) {
-  // Reverses the bytes of the vector.
-  const __vector unsigned char perm = {15, 14, 13, 12, 11, 10, 9, 8,
-                                       7,  6,  5,  4,  3,  2,  1, 0};
-  return vec_perm(v, v, perm);
-}
-
-// WARNING: these load/store in native byte order. It is OK to load and then
-// store an unchanged vector, but interpreting the bits as a number or input
-// to AES will have undefined results.
-inline ABSL_TARGET_CRYPTO Vector128 Vector128Load(const void* from) {
-  return vec_vsx_ld(0, reinterpret_cast<const Vector128*>(from));
-}
-
-inline ABSL_TARGET_CRYPTO void Vector128Store(const Vector128& v, void* to) {
-  vec_vsx_st(v, 0, reinterpret_cast<Vector128*>(to));
-}
-
-// One round of AES. "round_key" is a public constant for breaking the
-// symmetry of AES (ensures previously equal columns differ afterwards).
-inline ABSL_TARGET_CRYPTO Vector128 AesRound(const Vector128& state,
-                                             const Vector128& round_key) {
-  return Vector128(__builtin_crypto_vcipher(state, round_key));
-}
-
-// Enables native loads in the round loop by pre-swapping.
-inline ABSL_TARGET_CRYPTO void SwapEndian(u64x2* state) {
-  for (uint32_t block = 0; block < RandenTraits::kFeistelBlocks; ++block) {
-    Vector128Store(ReverseBytes(Vector128Load(state + block)), state + block);
-  }
-}
-
-}  // namespace
-
-#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
-
-// This asm directive will cause the file to be compiled with crypto extensions
-// whether or not the cpu-architecture supports it.
-#if ABSL_RANDEN_HWAES_IMPL_CRYPTO_DIRECTIVE
-asm(".arch_extension  crypto\n");
-
-// Override missing defines.
-#if !defined(__ARM_NEON)
-#define __ARM_NEON 1
-#endif
-
-#if !defined(__ARM_FEATURE_CRYPTO)
-#define __ARM_FEATURE_CRYPTO 1
-#endif
-
-#endif
-
-// Rely on the ARM NEON+Crypto advanced simd types, defined in <arm_neon.h>.
-// uint8x16_t is the user alias for underlying __simd128_uint8_t type.
-// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf
-//
-// <arm_neon> defines the following
-//
-// typedef __attribute__((neon_vector_type(16))) uint8_t uint8x16_t;
-// typedef __attribute__((neon_vector_type(16))) int8_t int8x16_t;
-// typedef __attribute__((neon_polyvector_type(16))) int8_t poly8x16_t;
-//
-// vld1q_v
-// vst1q_v
-// vaeseq_v
-// vaesmcq_v
-#include <arm_neon.h>
-
-// Already provides operator^=.
-using Vector128 = uint8x16_t;
-
-namespace {
-
-inline ABSL_TARGET_CRYPTO Vector128 Vector128Load(const void* from) {
-  return vld1q_u8(reinterpret_cast<const uint8_t*>(from));
-}
-
-inline ABSL_TARGET_CRYPTO void Vector128Store(const Vector128& v, void* to) {
-  vst1q_u8(reinterpret_cast<uint8_t*>(to), v);
-}
-
-// One round of AES. "round_key" is a public constant for breaking the
-// symmetry of AES (ensures previously equal columns differ afterwards).
-inline ABSL_TARGET_CRYPTO Vector128 AesRound(const Vector128& state,
-                                             const Vector128& round_key) {
-  // It is important to always use the full round function - omitting the
-  // final MixColumns reduces security [https://eprint.iacr.org/2010/041.pdf]
-  // and does not help because we never decrypt.
-  //
-  // Note that ARM divides AES instructions differently than x86 / PPC,
-  // And we need to skip the first AddRoundKey step and add an extra
-  // AddRoundKey step to the end. Lucky for us this is just XOR.
-  return vaesmcq_u8(vaeseq_u8(state, uint8x16_t{})) ^ round_key;
-}
-
-inline ABSL_TARGET_CRYPTO void SwapEndian(void*) {}
-
-}  // namespace
-
-#elif defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
-// On x86 we rely on the aesni instructions
-#include <wmmintrin.h>
-
-namespace {
-
-// Vector128 class is only wrapper for __m128i, benchmark indicates that it's
-// faster than using __m128i directly.
-class Vector128 {
- public:
-  // Convert from/to intrinsics.
-  inline explicit Vector128(const __m128i& Vector128) : data_(Vector128) {}
-
-  inline __m128i data() const { return data_; }
-
-  inline Vector128& operator^=(const Vector128& other) {
-    data_ = _mm_xor_si128(data_, other.data());
-    return *this;
-  }
-
- private:
-  __m128i data_;
-};
-
-inline ABSL_TARGET_CRYPTO Vector128 Vector128Load(const void* from) {
-  return Vector128(_mm_load_si128(reinterpret_cast<const __m128i*>(from)));
-}
-
-inline ABSL_TARGET_CRYPTO void Vector128Store(const Vector128& v, void* to) {
-  _mm_store_si128(reinterpret_cast<__m128i*>(to), v.data());
-}
-
-// One round of AES. "round_key" is a public constant for breaking the
-// symmetry of AES (ensures previously equal columns differ afterwards).
-inline ABSL_TARGET_CRYPTO Vector128 AesRound(const Vector128& state,
-                                             const Vector128& round_key) {
-  // It is important to always use the full round function - omitting the
-  // final MixColumns reduces security [https://eprint.iacr.org/2010/041.pdf]
-  // and does not help because we never decrypt.
-  return Vector128(_mm_aesenc_si128(state.data(), round_key.data()));
-}
-
-inline ABSL_TARGET_CRYPTO void SwapEndian(void*) {}
-
-}  // namespace
-
-#endif
-
-#ifdef __clang__
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunknown-pragmas"
-#endif
-
-// At this point, all of the platform-specific features have been defined /
-// implemented.
-//
-// REQUIRES: using Vector128 = ...
-// REQUIRES: Vector128 Vector128Load(void*) {...}
-// REQUIRES: void Vector128Store(Vector128, void*) {...}
-// REQUIRES: Vector128 AesRound(Vector128, Vector128) {...}
-// REQUIRES: void SwapEndian(uint64_t*) {...}
-//
-// PROVIDES: absl::random_internal::RandenHwAes::Absorb
-// PROVIDES: absl::random_internal::RandenHwAes::Generate
-namespace {
-
-// Block shuffles applies a shuffle to the entire state between AES rounds.
-// Improved odd-even shuffle from "New criterion for diffusion property".
-inline ABSL_TARGET_CRYPTO void BlockShuffle(u64x2* state) {
-  static_assert(RandenTraits::kFeistelBlocks == 16,
-                "Expecting 16 FeistelBlocks.");
-
-  constexpr size_t shuffle[RandenTraits::kFeistelBlocks] = {
-      7, 2, 13, 4, 11, 8, 3, 6, 15, 0, 9, 10, 1, 14, 5, 12};
-
-  const Vector128 v0 = Vector128Load(state + shuffle[0]);
-  const Vector128 v1 = Vector128Load(state + shuffle[1]);
-  const Vector128 v2 = Vector128Load(state + shuffle[2]);
-  const Vector128 v3 = Vector128Load(state + shuffle[3]);
-  const Vector128 v4 = Vector128Load(state + shuffle[4]);
-  const Vector128 v5 = Vector128Load(state + shuffle[5]);
-  const Vector128 v6 = Vector128Load(state + shuffle[6]);
-  const Vector128 v7 = Vector128Load(state + shuffle[7]);
-  const Vector128 w0 = Vector128Load(state + shuffle[8]);
-  const Vector128 w1 = Vector128Load(state + shuffle[9]);
-  const Vector128 w2 = Vector128Load(state + shuffle[10]);
-  const Vector128 w3 = Vector128Load(state + shuffle[11]);
-  const Vector128 w4 = Vector128Load(state + shuffle[12]);
-  const Vector128 w5 = Vector128Load(state + shuffle[13]);
-  const Vector128 w6 = Vector128Load(state + shuffle[14]);
-  const Vector128 w7 = Vector128Load(state + shuffle[15]);
-
-  Vector128Store(v0, state + 0);
-  Vector128Store(v1, state + 1);
-  Vector128Store(v2, state + 2);
-  Vector128Store(v3, state + 3);
-  Vector128Store(v4, state + 4);
-  Vector128Store(v5, state + 5);
-  Vector128Store(v6, state + 6);
-  Vector128Store(v7, state + 7);
-  Vector128Store(w0, state + 8);
-  Vector128Store(w1, state + 9);
-  Vector128Store(w2, state + 10);
-  Vector128Store(w3, state + 11);
-  Vector128Store(w4, state + 12);
-  Vector128Store(w5, state + 13);
-  Vector128Store(w6, state + 14);
-  Vector128Store(w7, state + 15);
-}
-
-// Feistel round function using two AES subrounds. Very similar to F()
-// from Simpira v2, but with independent subround keys. Uses 17 AES rounds
-// per 16 bytes (vs. 10 for AES-CTR). Computing eight round functions in
-// parallel hides the 7-cycle AESNI latency on HSW. Note that the Feistel
-// XORs are 'free' (included in the second AES instruction).
-inline ABSL_TARGET_CRYPTO const u64x2* FeistelRound(
-    u64x2* state, const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
-  static_assert(RandenTraits::kFeistelBlocks == 16,
-                "Expecting 16 FeistelBlocks.");
-
-  // MSVC does a horrible job at unrolling loops.
-  // So we unroll the loop by hand to improve the performance.
-  const Vector128 s0 = Vector128Load(state + 0);
-  const Vector128 s1 = Vector128Load(state + 1);
-  const Vector128 s2 = Vector128Load(state + 2);
-  const Vector128 s3 = Vector128Load(state + 3);
-  const Vector128 s4 = Vector128Load(state + 4);
-  const Vector128 s5 = Vector128Load(state + 5);
-  const Vector128 s6 = Vector128Load(state + 6);
-  const Vector128 s7 = Vector128Load(state + 7);
-  const Vector128 s8 = Vector128Load(state + 8);
-  const Vector128 s9 = Vector128Load(state + 9);
-  const Vector128 s10 = Vector128Load(state + 10);
-  const Vector128 s11 = Vector128Load(state + 11);
-  const Vector128 s12 = Vector128Load(state + 12);
-  const Vector128 s13 = Vector128Load(state + 13);
-  const Vector128 s14 = Vector128Load(state + 14);
-  const Vector128 s15 = Vector128Load(state + 15);
-
-  // Encode even blocks with keys.
-  const Vector128 e0 = AesRound(s0, Vector128Load(keys + 0));
-  const Vector128 e2 = AesRound(s2, Vector128Load(keys + 1));
-  const Vector128 e4 = AesRound(s4, Vector128Load(keys + 2));
-  const Vector128 e6 = AesRound(s6, Vector128Load(keys + 3));
-  const Vector128 e8 = AesRound(s8, Vector128Load(keys + 4));
-  const Vector128 e10 = AesRound(s10, Vector128Load(keys + 5));
-  const Vector128 e12 = AesRound(s12, Vector128Load(keys + 6));
-  const Vector128 e14 = AesRound(s14, Vector128Load(keys + 7));
-
-  // Encode odd blocks with even output from above.
-  const Vector128 o1 = AesRound(e0, s1);
-  const Vector128 o3 = AesRound(e2, s3);
-  const Vector128 o5 = AesRound(e4, s5);
-  const Vector128 o7 = AesRound(e6, s7);
-  const Vector128 o9 = AesRound(e8, s9);
-  const Vector128 o11 = AesRound(e10, s11);
-  const Vector128 o13 = AesRound(e12, s13);
-  const Vector128 o15 = AesRound(e14, s15);
-
-  // Store odd blocks. (These will be shuffled later).
-  Vector128Store(o1, state + 1);
-  Vector128Store(o3, state + 3);
-  Vector128Store(o5, state + 5);
-  Vector128Store(o7, state + 7);
-  Vector128Store(o9, state + 9);
-  Vector128Store(o11, state + 11);
-  Vector128Store(o13, state + 13);
-  Vector128Store(o15, state + 15);
-
-  return keys + 8;
-}
-
-// Cryptographic permutation based via type-2 Generalized Feistel Network.
-// Indistinguishable from ideal by chosen-ciphertext adversaries using less than
-// 2^64 queries if the round function is a PRF. This is similar to the b=8 case
-// of Simpira v2, but more efficient than its generic construction for b=16.
-inline ABSL_TARGET_CRYPTO void Permute(
-    u64x2* state, const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
-  // (Successfully unrolled; the first iteration jumps into the second half)
-#ifdef __clang__
-#pragma clang loop unroll_count(2)
-#endif
-  for (size_t round = 0; round < RandenTraits::kFeistelRounds; ++round) {
-    keys = FeistelRound(state, keys);
-    BlockShuffle(state);
-  }
-}
-
-}  // namespace
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-bool HasRandenHwAesImplementation() { return true; }
-
-const void* ABSL_TARGET_CRYPTO RandenHwAes::GetKeys() {
-  // Round keys for one AES per Feistel round and branch.
-  // The canonical implementation uses first digits of Pi.
-#if defined(ABSL_ARCH_PPC)
-  return kRandenRoundKeysBE;
-#else
-  return kRandenRoundKeys;
-#endif
-}
-
-// NOLINTNEXTLINE
-void ABSL_TARGET_CRYPTO RandenHwAes::Absorb(const void* seed_void,
-                                            void* state_void) {
-  static_assert(RandenTraits::kCapacityBytes / sizeof(Vector128) == 1,
-                "Unexpected Randen kCapacityBlocks");
-  static_assert(RandenTraits::kStateBytes / sizeof(Vector128) == 16,
-                "Unexpected Randen kStateBlocks");
-
-  auto* state =
-      reinterpret_cast<u64x2 * ABSL_RANDOM_INTERNAL_RESTRICT>(state_void);
-  const auto* seed =
-      reinterpret_cast<const u64x2 * ABSL_RANDOM_INTERNAL_RESTRICT>(seed_void);
-
-  Vector128 b1 = Vector128Load(state + 1);
-  b1 ^= Vector128Load(seed + 0);
-  Vector128Store(b1, state + 1);
-
-  Vector128 b2 = Vector128Load(state + 2);
-  b2 ^= Vector128Load(seed + 1);
-  Vector128Store(b2, state + 2);
-
-  Vector128 b3 = Vector128Load(state + 3);
-  b3 ^= Vector128Load(seed + 2);
-  Vector128Store(b3, state + 3);
-
-  Vector128 b4 = Vector128Load(state + 4);
-  b4 ^= Vector128Load(seed + 3);
-  Vector128Store(b4, state + 4);
-
-  Vector128 b5 = Vector128Load(state + 5);
-  b5 ^= Vector128Load(seed + 4);
-  Vector128Store(b5, state + 5);
-
-  Vector128 b6 = Vector128Load(state + 6);
-  b6 ^= Vector128Load(seed + 5);
-  Vector128Store(b6, state + 6);
-
-  Vector128 b7 = Vector128Load(state + 7);
-  b7 ^= Vector128Load(seed + 6);
-  Vector128Store(b7, state + 7);
-
-  Vector128 b8 = Vector128Load(state + 8);
-  b8 ^= Vector128Load(seed + 7);
-  Vector128Store(b8, state + 8);
-
-  Vector128 b9 = Vector128Load(state + 9);
-  b9 ^= Vector128Load(seed + 8);
-  Vector128Store(b9, state + 9);
-
-  Vector128 b10 = Vector128Load(state + 10);
-  b10 ^= Vector128Load(seed + 9);
-  Vector128Store(b10, state + 10);
-
-  Vector128 b11 = Vector128Load(state + 11);
-  b11 ^= Vector128Load(seed + 10);
-  Vector128Store(b11, state + 11);
-
-  Vector128 b12 = Vector128Load(state + 12);
-  b12 ^= Vector128Load(seed + 11);
-  Vector128Store(b12, state + 12);
-
-  Vector128 b13 = Vector128Load(state + 13);
-  b13 ^= Vector128Load(seed + 12);
-  Vector128Store(b13, state + 13);
-
-  Vector128 b14 = Vector128Load(state + 14);
-  b14 ^= Vector128Load(seed + 13);
-  Vector128Store(b14, state + 14);
-
-  Vector128 b15 = Vector128Load(state + 15);
-  b15 ^= Vector128Load(seed + 14);
-  Vector128Store(b15, state + 15);
-}
-
-// NOLINTNEXTLINE
-void ABSL_TARGET_CRYPTO RandenHwAes::Generate(const void* keys_void,
-                                              void* state_void) {
-  static_assert(RandenTraits::kCapacityBytes == sizeof(Vector128),
-                "Capacity mismatch");
-
-  auto* state = reinterpret_cast<u64x2*>(state_void);
-  const auto* keys = reinterpret_cast<const u64x2*>(keys_void);
-
-  const Vector128 prev_inner = Vector128Load(state);
-
-  SwapEndian(state);
-
-  Permute(state, keys);
-
-  SwapEndian(state);
-
-  // Ensure backtracking resistance.
-  Vector128 inner = Vector128Load(state);
-  inner ^= prev_inner;
-  Vector128Store(inner, state);
-}
-
-#ifdef __clang__
-#pragma clang diagnostic pop
-#endif
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // (ABSL_RANDEN_HWAES_IMPL)
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_hwaes.h b/third_party/abseil_cpp/absl/random/internal/randen_hwaes.h
deleted file mode 100644
index bce36b522609..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_hwaes.h
+++ /dev/null
@@ -1,50 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_
-#define ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_
-
-#include "absl/base/config.h"
-
-// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
-// symbols from arbitrary system and other headers, since it may be built
-// with different flags from other targets, using different levels of
-// optimization, potentially introducing ODR violations.
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// RANDen = RANDom generator or beetroots in Swiss German.
-// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
-// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
-//
-// RandenHwAes implements the basic state manipulation methods.
-class RandenHwAes {
- public:
-  static void Generate(const void* keys, void* state_void);
-  static void Absorb(const void* seed_void, void* state_void);
-  static const void* GetKeys();
-};
-
-// HasRandenHwAesImplementation returns true when there is an accelerated
-// implementation, and false otherwise.  If there is no implementation,
-// then attempting to use it will abort the program.
-bool HasRandenHwAesImplementation();
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_hwaes_test.cc b/third_party/abseil_cpp/absl/random/internal/randen_hwaes_test.cc
deleted file mode 100644
index 66ddb43fd6a7..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_hwaes_test.cc
+++ /dev/null
@@ -1,104 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/randen_hwaes.h"
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/random/internal/platform.h"
-#include "absl/random/internal/randen_detect.h"
-#include "absl/random/internal/randen_traits.h"
-#include "absl/strings/str_format.h"
-
-namespace {
-
-using absl::random_internal::RandenHwAes;
-using absl::random_internal::RandenTraits;
-
-// Local state parameters.
-constexpr size_t kSeedBytes =
-    RandenTraits::kStateBytes - RandenTraits::kCapacityBytes;
-constexpr size_t kStateSizeT = RandenTraits::kStateBytes / sizeof(uint64_t);
-constexpr size_t kSeedSizeT = kSeedBytes / sizeof(uint32_t);
-
-struct alignas(16) randen {
-  uint64_t state[kStateSizeT];
-  uint32_t seed[kSeedSizeT];
-};
-
-TEST(RandenHwAesTest, Default) {
-  EXPECT_TRUE(absl::random_internal::CPUSupportsRandenHwAes());
-
-  constexpr uint64_t kGolden[] = {
-      0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
-      0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
-      0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
-      0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
-      0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
-      0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
-      0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
-      0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
-      0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
-      0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
-      0x026ff374c101da7e, 0x811ef0821c3de851,
-  };
-
-  alignas(16) randen d;
-  memset(d.state, 0, sizeof(d.state));
-  RandenHwAes::Generate(RandenHwAes::GetKeys(), d.state);
-
-  uint64_t* id = d.state;
-  for (const auto& elem : kGolden) {
-    auto a = absl::StrFormat("%#x", elem);
-    auto b = absl::StrFormat("%#x", *id++);
-    EXPECT_EQ(a, b);
-  }
-}
-
-}  // namespace
-
-int main(int argc, char* argv[]) {
-  testing::InitGoogleTest(&argc, argv);
-
-  ABSL_RAW_LOG(INFO, "ABSL_HAVE_ACCELERATED_AES=%d", ABSL_HAVE_ACCELERATED_AES);
-  ABSL_RAW_LOG(INFO, "ABSL_RANDOM_INTERNAL_AES_DISPATCH=%d",
-               ABSL_RANDOM_INTERNAL_AES_DISPATCH);
-
-#if defined(ABSL_ARCH_X86_64)
-  ABSL_RAW_LOG(INFO, "ABSL_ARCH_X86_64");
-#elif defined(ABSL_ARCH_X86_32)
-  ABSL_RAW_LOG(INFO, "ABSL_ARCH_X86_32");
-#elif defined(ABSL_ARCH_AARCH64)
-  ABSL_RAW_LOG(INFO, "ABSL_ARCH_AARCH64");
-#elif defined(ABSL_ARCH_ARM)
-  ABSL_RAW_LOG(INFO, "ABSL_ARCH_ARM");
-#elif defined(ABSL_ARCH_PPC)
-  ABSL_RAW_LOG(INFO, "ABSL_ARCH_PPC");
-#else
-  ABSL_RAW_LOG(INFO, "ARCH Unknown");
-#endif
-
-  int x = absl::random_internal::HasRandenHwAesImplementation();
-  ABSL_RAW_LOG(INFO, "HasRandenHwAesImplementation = %d", x);
-
-  int y = absl::random_internal::CPUSupportsRandenHwAes();
-  ABSL_RAW_LOG(INFO, "CPUSupportsRandenHwAes = %d", x);
-
-  if (!x || !y) {
-    ABSL_RAW_LOG(INFO, "Skipping Randen HWAES tests.");
-    return 0;
-  }
-  return RUN_ALL_TESTS();
-}
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_round_keys.cc b/third_party/abseil_cpp/absl/random/internal/randen_round_keys.cc
deleted file mode 100644
index 5fb3ca556db6..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_round_keys.cc
+++ /dev/null
@@ -1,462 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/randen_traits.h"
-
-// This file contains only the round keys for randen.
-//
-// "Nothing up my sleeve" numbers from the first hex digits of Pi, obtained
-// from http://hexpi.sourceforge.net/. The array was generated by following
-// Python script:
-
-/*
-python >tmp.cc << EOF
-"""Generates Randen round keys array from pi-hex.62500.txt file."""
-import binascii
-
-KEYS = 17 * 8
-
-def chunks(l, n):
-    """Yield successive n-sized chunks from l."""
-    for i in range(0, len(l), n):
-        yield l[i:i + n]
-
-def pairwise(t):
-    """Transforms sequence into sequence of pairs."""
-    it = iter(t)
-    return zip(it,it)
-
-def digits_from_pi():
-  """Reads digits from hexpi.sourceforge.net file."""
-  with open("pi-hex.62500.txt") as file:
-    return file.read()
-
-def digits_from_urandom():
-  """Reads digits from /dev/urandom."""
-  with open("/dev/urandom") as file:
-    return binascii.hexlify(file.read(KEYS * 16))
-
-def print_row(b)
-  print("  0x{0}, 0x{1}, 0x{2}, 0x{3}, 0x{4}, 0x{5}, 0x{6}, 0x{7}, 0x{8}, 0x{9},
-0x{10}, 0x{11}, 0x{12}, 0x{13}, 0x{14}, 0x{15},".format(*b))
-
-
-digits = digits_from_pi()
-#digits = digits_from_urandom()
-
-print("namespace {")
-print("static constexpr size_t kKeyBytes = {0};\n".format(KEYS * 16))
-print("}")
-
-print("alignas(16) const unsigned char kRandenRoundKeysBE[kKeyBytes] = {")
-
-for i, u16 in zip(range(KEYS), chunks(digits, 32)):
-  b = list(chunks(u16, 2))
-  print_row(b)
-
-print("};")
-
-print("alignas(16) const unsigned char kRandenRoundKeys[kKeyBytes] = {")
-
-for i, u16 in zip(range(KEYS), chunks(digits, 32)):
-  b = list(chunks(u16, 2))
-  b.reverse()
-  print_row(b)
-
-print("};")
-
-EOF
-
-*/
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-static constexpr size_t kKeyBytes = 2176;
-}
-
-alignas(16) const unsigned char kRandenRoundKeysBE[kKeyBytes] = {
-    0x24, 0x3F, 0x6A, 0x88, 0x85, 0xA3, 0x08, 0xD3, 0x13, 0x19, 0x8A, 0x2E,
-    0x03, 0x70, 0x73, 0x44, 0xA4, 0x09, 0x38, 0x22, 0x29, 0x9F, 0x31, 0xD0,
-    0x08, 0x2E, 0xFA, 0x98, 0xEC, 0x4E, 0x6C, 0x89, 0x45, 0x28, 0x21, 0xE6,
-    0x38, 0xD0, 0x13, 0x77, 0xBE, 0x54, 0x66, 0xCF, 0x34, 0xE9, 0x0C, 0x6C,
-    0xC0, 0xAC, 0x29, 0xB7, 0xC9, 0x7C, 0x50, 0xDD, 0x3F, 0x84, 0xD5, 0xB5,
-    0xB5, 0x47, 0x09, 0x17, 0x92, 0x16, 0xD5, 0xD9, 0x89, 0x79, 0xFB, 0x1B,
-    0xD1, 0x31, 0x0B, 0xA6, 0x98, 0xDF, 0xB5, 0xAC, 0x2F, 0xFD, 0x72, 0xDB,
-    0xD0, 0x1A, 0xDF, 0xB7, 0xB8, 0xE1, 0xAF, 0xED, 0x6A, 0x26, 0x7E, 0x96,
-    0xBA, 0x7C, 0x90, 0x45, 0xF1, 0x2C, 0x7F, 0x99, 0x24, 0xA1, 0x99, 0x47,
-    0xB3, 0x91, 0x6C, 0xF7, 0x08, 0x01, 0xF2, 0xE2, 0x85, 0x8E, 0xFC, 0x16,
-    0x63, 0x69, 0x20, 0xD8, 0x71, 0x57, 0x4E, 0x69, 0xA4, 0x58, 0xFE, 0xA3,
-    0xF4, 0x93, 0x3D, 0x7E, 0x0D, 0x95, 0x74, 0x8F, 0x72, 0x8E, 0xB6, 0x58,
-    0x71, 0x8B, 0xCD, 0x58, 0x82, 0x15, 0x4A, 0xEE, 0x7B, 0x54, 0xA4, 0x1D,
-    0xC2, 0x5A, 0x59, 0xB5, 0x9C, 0x30, 0xD5, 0x39, 0x2A, 0xF2, 0x60, 0x13,
-    0xC5, 0xD1, 0xB0, 0x23, 0x28, 0x60, 0x85, 0xF0, 0xCA, 0x41, 0x79, 0x18,
-    0xB8, 0xDB, 0x38, 0xEF, 0x8E, 0x79, 0xDC, 0xB0, 0x60, 0x3A, 0x18, 0x0E,
-    0x6C, 0x9E, 0x0E, 0x8B, 0xB0, 0x1E, 0x8A, 0x3E, 0xD7, 0x15, 0x77, 0xC1,
-    0xBD, 0x31, 0x4B, 0x27, 0x78, 0xAF, 0x2F, 0xDA, 0x55, 0x60, 0x5C, 0x60,
-    0xE6, 0x55, 0x25, 0xF3, 0xAA, 0x55, 0xAB, 0x94, 0x57, 0x48, 0x98, 0x62,
-    0x63, 0xE8, 0x14, 0x40, 0x55, 0xCA, 0x39, 0x6A, 0x2A, 0xAB, 0x10, 0xB6,
-    0xB4, 0xCC, 0x5C, 0x34, 0x11, 0x41, 0xE8, 0xCE, 0xA1, 0x54, 0x86, 0xAF,
-    0x7C, 0x72, 0xE9, 0x93, 0xB3, 0xEE, 0x14, 0x11, 0x63, 0x6F, 0xBC, 0x2A,
-    0x2B, 0xA9, 0xC5, 0x5D, 0x74, 0x18, 0x31, 0xF6, 0xCE, 0x5C, 0x3E, 0x16,
-    0x9B, 0x87, 0x93, 0x1E, 0xAF, 0xD6, 0xBA, 0x33, 0x6C, 0x24, 0xCF, 0x5C,
-    0x7A, 0x32, 0x53, 0x81, 0x28, 0x95, 0x86, 0x77, 0x3B, 0x8F, 0x48, 0x98,
-    0x6B, 0x4B, 0xB9, 0xAF, 0xC4, 0xBF, 0xE8, 0x1B, 0x66, 0x28, 0x21, 0x93,
-    0x61, 0xD8, 0x09, 0xCC, 0xFB, 0x21, 0xA9, 0x91, 0x48, 0x7C, 0xAC, 0x60,
-    0x5D, 0xEC, 0x80, 0x32, 0xEF, 0x84, 0x5D, 0x5D, 0xE9, 0x85, 0x75, 0xB1,
-    0xDC, 0x26, 0x23, 0x02, 0xEB, 0x65, 0x1B, 0x88, 0x23, 0x89, 0x3E, 0x81,
-    0xD3, 0x96, 0xAC, 0xC5, 0x0F, 0x6D, 0x6F, 0xF3, 0x83, 0xF4, 0x42, 0x39,
-    0x2E, 0x0B, 0x44, 0x82, 0xA4, 0x84, 0x20, 0x04, 0x69, 0xC8, 0xF0, 0x4A,
-    0x9E, 0x1F, 0x9B, 0x5E, 0x21, 0xC6, 0x68, 0x42, 0xF6, 0xE9, 0x6C, 0x9A,
-    0x67, 0x0C, 0x9C, 0x61, 0xAB, 0xD3, 0x88, 0xF0, 0x6A, 0x51, 0xA0, 0xD2,
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-    0x41, 0x15, 0x20, 0xF7, 0x76, 0x02, 0xD4, 0xF7, 0xBC, 0xF4, 0x6B, 0x2E,
-    0xD4, 0xA1, 0x00, 0x68, 0xD4, 0x08, 0x24, 0x71, 0x33, 0x20, 0xF4, 0x6A,
-    0x43, 0xB7, 0xD4, 0xB7, 0x50, 0x00, 0x61, 0xAF, 0x1E, 0x39, 0xF6, 0x2E,
-    0x97, 0x24, 0x45, 0x46,
-};
-
-alignas(16) const unsigned char kRandenRoundKeys[kKeyBytes] = {
-    0x44, 0x73, 0x70, 0x03, 0x2E, 0x8A, 0x19, 0x13, 0xD3, 0x08, 0xA3, 0x85,
-    0x88, 0x6A, 0x3F, 0x24, 0x89, 0x6C, 0x4E, 0xEC, 0x98, 0xFA, 0x2E, 0x08,
-    0xD0, 0x31, 0x9F, 0x29, 0x22, 0x38, 0x09, 0xA4, 0x6C, 0x0C, 0xE9, 0x34,
-    0xCF, 0x66, 0x54, 0xBE, 0x77, 0x13, 0xD0, 0x38, 0xE6, 0x21, 0x28, 0x45,
-    0x17, 0x09, 0x47, 0xB5, 0xB5, 0xD5, 0x84, 0x3F, 0xDD, 0x50, 0x7C, 0xC9,
-    0xB7, 0x29, 0xAC, 0xC0, 0xAC, 0xB5, 0xDF, 0x98, 0xA6, 0x0B, 0x31, 0xD1,
-    0x1B, 0xFB, 0x79, 0x89, 0xD9, 0xD5, 0x16, 0x92, 0x96, 0x7E, 0x26, 0x6A,
-    0xED, 0xAF, 0xE1, 0xB8, 0xB7, 0xDF, 0x1A, 0xD0, 0xDB, 0x72, 0xFD, 0x2F,
-    0xF7, 0x6C, 0x91, 0xB3, 0x47, 0x99, 0xA1, 0x24, 0x99, 0x7F, 0x2C, 0xF1,
-    0x45, 0x90, 0x7C, 0xBA, 0x69, 0x4E, 0x57, 0x71, 0xD8, 0x20, 0x69, 0x63,
-    0x16, 0xFC, 0x8E, 0x85, 0xE2, 0xF2, 0x01, 0x08, 0x58, 0xB6, 0x8E, 0x72,
-    0x8F, 0x74, 0x95, 0x0D, 0x7E, 0x3D, 0x93, 0xF4, 0xA3, 0xFE, 0x58, 0xA4,
-    0xB5, 0x59, 0x5A, 0xC2, 0x1D, 0xA4, 0x54, 0x7B, 0xEE, 0x4A, 0x15, 0x82,
-    0x58, 0xCD, 0x8B, 0x71, 0xF0, 0x85, 0x60, 0x28, 0x23, 0xB0, 0xD1, 0xC5,
-    0x13, 0x60, 0xF2, 0x2A, 0x39, 0xD5, 0x30, 0x9C, 0x0E, 0x18, 0x3A, 0x60,
-    0xB0, 0xDC, 0x79, 0x8E, 0xEF, 0x38, 0xDB, 0xB8, 0x18, 0x79, 0x41, 0xCA,
-    0x27, 0x4B, 0x31, 0xBD, 0xC1, 0x77, 0x15, 0xD7, 0x3E, 0x8A, 0x1E, 0xB0,
-    0x8B, 0x0E, 0x9E, 0x6C, 0x94, 0xAB, 0x55, 0xAA, 0xF3, 0x25, 0x55, 0xE6,
-    0x60, 0x5C, 0x60, 0x55, 0xDA, 0x2F, 0xAF, 0x78, 0xB6, 0x10, 0xAB, 0x2A,
-    0x6A, 0x39, 0xCA, 0x55, 0x40, 0x14, 0xE8, 0x63, 0x62, 0x98, 0x48, 0x57,
-    0x93, 0xE9, 0x72, 0x7C, 0xAF, 0x86, 0x54, 0xA1, 0xCE, 0xE8, 0x41, 0x11,
-    0x34, 0x5C, 0xCC, 0xB4, 0xF6, 0x31, 0x18, 0x74, 0x5D, 0xC5, 0xA9, 0x2B,
-    0x2A, 0xBC, 0x6F, 0x63, 0x11, 0x14, 0xEE, 0xB3, 0x5C, 0xCF, 0x24, 0x6C,
-    0x33, 0xBA, 0xD6, 0xAF, 0x1E, 0x93, 0x87, 0x9B, 0x16, 0x3E, 0x5C, 0xCE,
-    0xAF, 0xB9, 0x4B, 0x6B, 0x98, 0x48, 0x8F, 0x3B, 0x77, 0x86, 0x95, 0x28,
-    0x81, 0x53, 0x32, 0x7A, 0x91, 0xA9, 0x21, 0xFB, 0xCC, 0x09, 0xD8, 0x61,
-    0x93, 0x21, 0x28, 0x66, 0x1B, 0xE8, 0xBF, 0xC4, 0xB1, 0x75, 0x85, 0xE9,
-    0x5D, 0x5D, 0x84, 0xEF, 0x32, 0x80, 0xEC, 0x5D, 0x60, 0xAC, 0x7C, 0x48,
-    0xC5, 0xAC, 0x96, 0xD3, 0x81, 0x3E, 0x89, 0x23, 0x88, 0x1B, 0x65, 0xEB,
-    0x02, 0x23, 0x26, 0xDC, 0x04, 0x20, 0x84, 0xA4, 0x82, 0x44, 0x0B, 0x2E,
-    0x39, 0x42, 0xF4, 0x83, 0xF3, 0x6F, 0x6D, 0x0F, 0x9A, 0x6C, 0xE9, 0xF6,
-    0x42, 0x68, 0xC6, 0x21, 0x5E, 0x9B, 0x1F, 0x9E, 0x4A, 0xF0, 0xC8, 0x69,
-    0x68, 0x2F, 0x54, 0xD8, 0xD2, 0xA0, 0x51, 0x6A, 0xF0, 0x88, 0xD3, 0xAB,
-    0x61, 0x9C, 0x0C, 0x67, 0xE4, 0x3B, 0x7A, 0x13, 0x6C, 0x0B, 0xEF, 0x6E,
-    0xA3, 0x33, 0x51, 0xAB, 0x28, 0xA7, 0x0F, 0x96, 0x76, 0x01, 0xAF, 0x39,
-    0x1D, 0x65, 0xF1, 0xA1, 0x98, 0x2A, 0xFB, 0x7E, 0x50, 0xF0, 0x3B, 0xBA,
-    0xB4, 0x9F, 0x6F, 0x45, 0x19, 0x86, 0xEE, 0x8C, 0x88, 0x0E, 0x43, 0x82,
-    0x3E, 0x59, 0xCA, 0x66, 0x73, 0x20, 0xC1, 0x85, 0xD8, 0x75, 0x6F, 0xE0,
-    0xBE, 0x5E, 0x8B, 0x3B, 0xC3, 0xA5, 0x84, 0x7D, 0x06, 0x77, 0x3F, 0x36,
-    0x62, 0xAA, 0xD3, 0x4E, 0xA6, 0x6A, 0xC1, 0x56, 0x9F, 0x44, 0x1A, 0x40,
-    0x48, 0x12, 0x0A, 0xD0, 0x24, 0xD7, 0xD0, 0x37, 0x3D, 0x02, 0x9B, 0x42,
-    0x72, 0xDF, 0xFE, 0x1B, 0x7B, 0x1B, 0x99, 0x80, 0xC9, 0x72, 0x53, 0x07,
-    0x9B, 0xC0, 0xF1, 0x49, 0xD3, 0xEA, 0x0F, 0xDB, 0x3B, 0x4C, 0x79, 0xB6,
-    0x1A, 0x50, 0xFE, 0xE3, 0xF7, 0xDE, 0xE8, 0xF6, 0xD8, 0x79, 0xD4, 0x25,
-    0xC4, 0x60, 0x9F, 0x40, 0xB6, 0x4F, 0xA9, 0xC1, 0xBA, 0x06, 0xC0, 0x04,
-    0xBD, 0xE0, 0x6C, 0x97, 0xB5, 0x53, 0x6C, 0x3E, 0xAF, 0x6F, 0xFB, 0x68,
-    0x63, 0x24, 0x6A, 0x19, 0xC2, 0x9E, 0x5C, 0x5E, 0x2C, 0x95, 0x30, 0x9B,
-    0x1F, 0x51, 0xFC, 0x6D, 0x6F, 0xEC, 0x52, 0x3B, 0xEB, 0xB2, 0x39, 0x13,
-    0xFD, 0x4A, 0x33, 0xDE, 0x04, 0xD0, 0xE3, 0xBE, 0x09, 0xBD, 0x5E, 0xAF,
-    0x44, 0x45, 0x81, 0xCC, 0x0F, 0x74, 0xC8, 0x45, 0x57, 0xA8, 0xCB, 0xC0,
-    0xB3, 0x4B, 0x2E, 0x19, 0x07, 0x28, 0x0F, 0x66, 0x0A, 0x32, 0x60, 0x1A,
-    0xBD, 0xC0, 0x79, 0x55, 0xDB, 0xFB, 0xD3, 0xB9, 0x39, 0x5F, 0x0B, 0xD2,
-    0xCC, 0xA3, 0x1F, 0xFB, 0xFE, 0x25, 0x9F, 0x67, 0x79, 0x72, 0x2C, 0x40,
-    0xC6, 0x00, 0xA1, 0xD6, 0x15, 0x6B, 0x61, 0xFD, 0xDF, 0x16, 0x75, 0x3C,
-    0xF8, 0x22, 0x32, 0xDB, 0xF8, 0xE9, 0xA5, 0x8E, 0x60, 0x87, 0x23, 0xFD,
-    0xFA, 0xB5, 0x3D, 0x32, 0xAB, 0x52, 0x05, 0xAD, 0xC8, 0x1E, 0x50, 0x2F,
-    0xA0, 0x8C, 0x6F, 0xCA, 0xBB, 0x57, 0x5C, 0x9E, 0x82, 0xDF, 0x00, 0x3E,
-    0x48, 0x7B, 0x31, 0x53, 0xC3, 0xFF, 0x7E, 0x28, 0xF6, 0xA8, 0x42, 0xD5,
-    0xDB, 0x69, 0x17, 0xDF, 0x2E, 0x56, 0x87, 0x1A, 0xC8, 0x58, 0xCA, 0xBB,
-    0xB0, 0x27, 0x5B, 0x69, 0x73, 0x55, 0x4F, 0x8C, 0xC6, 0x32, 0x67, 0xAC,
-    0xB8, 0x83, 0x21, 0xFD, 0x98, 0x3D, 0xFA, 0x10, 0xA0, 0x11, 0xF0, 0xB8,
-    0x5D, 0xA3, 0xFF, 0xE1, 0x65, 0x45, 0xF8, 0xB6, 0x79, 0xE4, 0x53, 0x9A,
-    0x5B, 0xD3, 0xD1, 0x2D, 0x6C, 0xB5, 0xFC, 0x4A, 0x33, 0x7E, 0xCB, 0xA4,
-    0xDA, 0xF2, 0xDD, 0xE1, 0x90, 0x97, 0xFB, 0x4B, 0xBC, 0x49, 0x8E, 0xD2,
-    0x01, 0x4C, 0x77, 0x36, 0xDA, 0xCA, 0x20, 0xEF, 0xE8, 0xC6, 0xE4, 0xCE,
-    0x41, 0x13, 0xFB, 0x62, 0x98, 0x91, 0x90, 0xAE, 0x4D, 0xDA, 0xDB, 0x95,
-    0xB4, 0x1F, 0xF1, 0x2B, 0xFE, 0x9E, 0x7E, 0xD0, 0xE0, 0x25, 0xC7, 0xAF,
-    0xD0, 0xD1, 0x8E, 0xD0, 0xA0, 0xD5, 0x93, 0x6B, 0x71, 0x8E, 0xAD, 0xEA,
-    0x64, 0x2B, 0x12, 0xF2, 0xFB, 0xE2, 0xF6, 0x8F, 0xB7, 0x94, 0x75, 0x8E,
-    0x2F, 0x5B, 0x3C, 0x8E, 0x1C, 0xC3, 0x8F, 0x68, 0xA0, 0x5E, 0xAD, 0x4F,
-    0x1C, 0xF0, 0x0D, 0x90, 0x12, 0xB8, 0x88, 0x88, 0x77, 0x17, 0x0E, 0xBE,
-    0x18, 0x22, 0x2F, 0x2F, 0xAD, 0xC1, 0xA8, 0xB3, 0x91, 0xF1, 0xCF, 0xD1,
-    0xE8, 0x74, 0x6F, 0xB5, 0x0F, 0xCC, 0xA0, 0xE5, 0xA1, 0x1F, 0x02, 0x8B,
-    0xFE, 0x2D, 0x75, 0xEA, 0xB7, 0xE0, 0x13, 0xFD, 0xE0, 0x4F, 0xA8, 0xB4,
-    0x99, 0xE2, 0x89, 0xCE, 0xD6, 0xF3, 0xAC, 0x18, 0x05, 0x77, 0x95, 0x80,
-    0x66, 0xA2, 0x5F, 0x16, 0xD9, 0xA8, 0xAD, 0xD2, 0x81, 0x3B, 0xC4, 0x7C,
-    0x86, 0xFA, 0xB5, 0x77, 0x65, 0x20, 0xAD, 0xE6, 0x77, 0x14, 0x1A, 0x21,
-    0x14, 0x73, 0xCC, 0x93, 0xA0, 0x89, 0x3E, 0x7B, 0x0C, 0xAF, 0xCD, 0xEB,
-    0xCF, 0x35, 0x9D, 0xFB, 0xF5, 0x42, 0x54, 0xC7, 0x5E, 0xB3, 0x71, 0x20,
-    0x2D, 0x0E, 0x25, 0x00, 0x49, 0x7E, 0x1E, 0xAE, 0xD3, 0x1B, 0x41, 0xD6,
-    0x1E, 0xB9, 0x09, 0xF0, 0x9B, 0x36, 0x64, 0x24, 0xAF, 0xE0, 0xB8, 0x57,
-    0xBB, 0x00, 0x68, 0x22, 0x7F, 0x53, 0x5A, 0xD9, 0x89, 0x43, 0xC1, 0x78,
-    0xAA, 0xA6, 0xDF, 0x59, 0x1D, 0x91, 0x63, 0x55, 0xA9, 0xCF, 0x95, 0x62,
-    0x76, 0x03, 0x26, 0x83, 0xC5, 0xB9, 0xE5, 0x02, 0xA2, 0x5B, 0x7D, 0x20,
-    0x4A, 0xA9, 0x14, 0x7B, 0xCA, 0x2D, 0x47, 0xB3, 0x41, 0x4A, 0x73, 0x4E,
-    0x68, 0x19, 0xC8, 0x11, 0xE4, 0xC6, 0x9B, 0xBC, 0x3F, 0x57, 0x0F, 0xD6,
-    0x15, 0x29, 0x53, 0x9A, 0x52, 0x00, 0x51, 0x1B, 0x1F, 0xE9, 0x1B, 0x57,
-    0xB5, 0x6F, 0xBA, 0x08, 0x00, 0x74, 0xE6, 0x81, 0x76, 0xA4, 0x60, 0x2B,
-    0xB6, 0xF9, 0xB9, 0xE7, 0x21, 0x65, 0x63, 0xB6, 0x15, 0xD9, 0x0D, 0x2A,
-    0x6B, 0xEC, 0x96, 0xF2, 0xA1, 0x8F, 0x9F, 0xA9, 0x5D, 0x2D, 0xB0, 0x53,
-    0x64, 0x56, 0x85, 0xC5, 0x2E, 0x05, 0x34, 0xFF, 0x44, 0x29, 0xB3, 0xB5,
-    0xE9, 0x70, 0x7A, 0x4B, 0x6A, 0x07, 0x85, 0x6E, 0x99, 0x47, 0xBA, 0x08,
-    0x7D, 0xDF, 0xA7, 0x49, 0xB0, 0xA6, 0x6E, 0xAD, 0x23, 0x26, 0x19, 0xC4,
-    0x2E, 0x09, 0x75, 0xDB, 0xFF, 0x18, 0x9A, 0x69, 0x71, 0x8C, 0xAA, 0xEC,
-    0x66, 0xB2, 0xED, 0x8F, 0xB8, 0x60, 0xEE, 0x9C, 0x29, 0x4C, 0x09, 0x75,
-    0xA5, 0x02, 0x36, 0x19, 0xE1, 0x9E, 0xB1, 0xC2, 0x6C, 0x52, 0x64, 0x56,
-    0x65, 0x9D, 0x42, 0x5B, 0x9A, 0x98, 0x54, 0x3F, 0x3E, 0x3A, 0x18, 0xE4,
-    0x40, 0x13, 0x59, 0xA0, 0xF5, 0x30, 0xE8, 0xEF, 0x07, 0x9C, 0xD2, 0xA1,
-    0xD6, 0x3F, 0xF7, 0x99, 0xD6, 0xE4, 0x8F, 0x6B, 0x26, 0xEB, 0x70, 0x84,
-    0x86, 0x20, 0xDD, 0x4C, 0xC1, 0x5D, 0x25, 0xF0, 0xE6, 0x38, 0x2D, 0x4D,
-    0xC9, 0xEF, 0xBA, 0x3E, 0x3F, 0x6B, 0x68, 0x09, 0x5E, 0xCC, 0x1E, 0x02,
-    0xC6, 0xE9, 0x82, 0x63, 0x86, 0xE2, 0xA0, 0x52, 0x84, 0x35, 0x7F, 0x68,
-    0xA1, 0x70, 0x6A, 0x6B, 0x14, 0x18, 0x97, 0x3C, 0x5C, 0xAE, 0xDE, 0x7F,
-    0x1C, 0x84, 0x07, 0x3E, 0x37, 0x07, 0x50, 0xAA, 0x05, 0x53, 0x9C, 0xB7,
-    0x0D, 0x0C, 0x50, 0xF0, 0x37, 0xDA, 0x3A, 0xB0, 0xB8, 0xF2, 0x16, 0x57,
-    0xEC, 0x44, 0x7D, 0x8E, 0xB2, 0x74, 0xB5, 0x3C, 0x1A, 0xF5, 0x0C, 0xAE,
-    0xFF, 0xB3, 0x00, 0x02, 0x04, 0x1F, 0x1C, 0xF0, 0xF6, 0x2F, 0xA9, 0x7C,
-    0xF9, 0x13, 0x91, 0xD1, 0xBD, 0x21, 0x09, 0xDC, 0x58, 0x7A, 0x83, 0x25,
-    0xDC, 0xDA, 0xC2, 0x37, 0x81, 0xE5, 0xE5, 0x3A, 0x01, 0x47, 0xF5, 0x22,
-    0x73, 0x47, 0x32, 0x94, 0x0E, 0x03, 0xD0, 0x0F, 0x46, 0x61, 0x44, 0xA9,
-    0xA7, 0xDD, 0xF3, 0x9A, 0x34, 0x76, 0xB5, 0xC8, 0x2F, 0x0E, 0xEA, 0x3B,
-    0x99, 0xCD, 0x38, 0xE2, 0x41, 0x1E, 0x75, 0xA4, 0x3E, 0xC7, 0xC8, 0xEC,
-    0x08, 0xB9, 0x6D, 0x4F, 0x38, 0x8B, 0x54, 0x4E, 0x31, 0xB3, 0x3E, 0x18,
-    0xA1, 0xBB, 0x80, 0x32, 0x79, 0x7C, 0x97, 0x24, 0x90, 0x12, 0xB8, 0x2C,
-    0xBF, 0x04, 0x0A, 0xF6, 0x03, 0x0D, 0x42, 0x6F, 0x10, 0x08, 0x93, 0xD9,
-    0x1F, 0x77, 0x9A, 0xDE, 0xAF, 0x89, 0xAF, 0xBC, 0x72, 0xB0, 0x79, 0x56,
-    0x24, 0x71, 0x6B, 0x2E, 0x1F, 0x72, 0x12, 0x55, 0x2E, 0x3F, 0xCF, 0xDC,
-    0x12, 0xAE, 0x8B, 0xB3, 0x17, 0xDA, 0x08, 0x74, 0x18, 0x47, 0x58, 0x7A,
-    0x87, 0xCD, 0x84, 0x9F, 0xE6, 0xDD, 0x1A, 0x50, 0xFA, 0x1D, 0x85, 0xDB,
-    0x3A, 0xEC, 0x7A, 0xEC, 0x8C, 0x7D, 0x4B, 0xE9, 0xBC, 0x9A, 0x9F, 0xBC,
-    0x08, 0xD8, 0x15, 0x32, 0x47, 0x18, 0x1C, 0xEF, 0xD2, 0xC3, 0x64, 0xC4,
-    0x66, 0x43, 0x09, 0x63, 0x51, 0xC4, 0x65, 0x2A, 0x43, 0x4D, 0xA1, 0x12,
-    0x16, 0xBA, 0xC2, 0x24, 0x37, 0x3B, 0x43, 0xDD, 0x55, 0x4E, 0x31, 0x10,
-    0x9E, 0xF8, 0xDF, 0x71, 0xDD, 0xE4, 0x3A, 0x13, 0x02, 0x00, 0x94, 0x50,
-    0x6B, 0xC7, 0xA3, 0xD7, 0xF1, 0x56, 0x35, 0x04, 0x9B, 0x19, 0x11, 0x5F,
-    0xD6, 0x77, 0xAC, 0x81, 0xFA, 0xFB, 0xF1, 0x97, 0xED, 0xE6, 0x8F, 0xF2,
-    0x09, 0xA5, 0x24, 0x59, 0x3B, 0x18, 0x11, 0x3C, 0xB1, 0x6F, 0xE9, 0xEA,
-    0x70, 0x45, 0xE3, 0x86, 0x6E, 0x3C, 0x15, 0x1E, 0x2C, 0xBF, 0xBA, 0x9E,
-    0xFA, 0x06, 0x3D, 0x4E, 0x1C, 0xE7, 0x1F, 0x77, 0xB3, 0x2A, 0x3E, 0x5A,
-    0x0A, 0x5E, 0x0E, 0x86, 0x25, 0xC8, 0x66, 0x52, 0xD6, 0x89, 0x3E, 0x80,
-    0x0F, 0x1D, 0xE7, 0x99, 0xB9, 0xDC, 0x65, 0x29, 0x78, 0xEA, 0xE2, 0x94,
-    0xBA, 0x0E, 0x15, 0xC6, 0x6A, 0xB3, 0x10, 0x9C, 0x78, 0xC9, 0x4C, 0x2E,
-    0x3D, 0x2B, 0x1D, 0x36, 0xA7, 0x4E, 0xF7, 0xF2, 0xF4, 0x2D, 0x0A, 0x1E,
-    0x53, 0x3C, 0xFC, 0xA6, 0xB6, 0x12, 0x13, 0xF7, 0x08, 0xA7, 0x23, 0x52,
-    0x60, 0x79, 0xC2, 0x19, 0x0F, 0x26, 0x39, 0x19, 0x83, 0xC8, 0x7B, 0xA6,
-    0x95, 0x45, 0xBC, 0xE3, 0x66, 0x1F, 0xC3, 0xEA, 0x6E, 0xFE, 0xAD, 0xEB,
-    0xA5, 0x5A, 0x6C, 0xBE, 0xEF, 0xDD, 0x32, 0xC3, 0x28, 0xFF, 0x8C, 0x01,
-    0xD1, 0x37, 0x7F, 0xB1, 0x3B, 0x95, 0x2F, 0xDB, 0x0F, 0xA5, 0xCE, 0xEE,
-    0x02, 0x97, 0xAB, 0x68, 0x85, 0x21, 0x58, 0x65, 0x70, 0x61, 0x07, 0x29,
-    0x28, 0xB6, 0x21, 0x15, 0x84, 0x2F, 0x6E, 0x5B, 0xAD, 0x7D, 0xEF, 0x2A,
-    0x96, 0xBD, 0x61, 0xEB, 0x30, 0xA8, 0xCC, 0x13, 0x10, 0x15, 0x9F, 0x61,
-    0x75, 0x47, 0xDD, 0xEC, 0x39, 0xA2, 0x70, 0x4C, 0x90, 0x5C, 0x73, 0xB5,
-    0xCF, 0x63, 0x03, 0xAA, 0x1E, 0xFE, 0x34, 0x03, 0xA7, 0x2C, 0x62, 0x60,
-    0xBC, 0x86, 0xCC, 0xEE, 0x14, 0xDE, 0xAA, 0xCB, 0x0B, 0x9E, 0x9E, 0xD5,
-    0xCA, 0xF0, 0xBD, 0x19, 0xAF, 0x1E, 0x8B, 0x64, 0x6E, 0x84, 0xF3, 0xB2,
-    0xAB, 0x5C, 0xAB, 0x9C, 0xB3, 0xB4, 0x2A, 0x3C, 0x32, 0x5A, 0x68, 0x40,
-    0x50, 0xBB, 0x5A, 0x65, 0xB9, 0x69, 0x23, 0xA0, 0x99, 0xA0, 0x5F, 0x87,
-    0x19, 0x0B, 0x54, 0x9B, 0xF7, 0xB8, 0x21, 0xC0, 0xD5, 0xE9, 0x9E, 0x31,
-    0x77, 0x2D, 0xE3, 0x97, 0x9A, 0x88, 0x37, 0xF8, 0xA8, 0x7D, 0x3D, 0x62,
-    0x7E, 0x99, 0xF7, 0x95, 0xD6, 0x1F, 0xE6, 0xC7, 0x29, 0x88, 0x35, 0x0E,
-    0x81, 0x12, 0x68, 0x16, 0x5F, 0x93, 0xED, 0x11, 0x63, 0x72, 0x22, 0x1B,
-    0xA5, 0x84, 0xF5, 0x57, 0x99, 0xBA, 0x58, 0x78, 0xA1, 0xDF, 0xDE, 0x96,
-    0x54, 0x30, 0x2E, 0x53, 0xEB, 0x0A, 0xB3, 0xCD, 0x96, 0x46, 0xC2, 0x1A,
-    0xFF, 0xC3, 0x83, 0x9B, 0xEA, 0xFF, 0xC6, 0x34, 0xEF, 0xF2, 0xEB, 0x58,
-    0x28, 0x31, 0xBC, 0x6D, 0xE4, 0x48, 0xD9, 0x8F, 0xE3, 0xB7, 0x64, 0xE8,
-    0xD9, 0x14, 0x4A, 0x5D, 0x73, 0x3C, 0x7C, 0xEE, 0x61, 0xED, 0x28, 0xFE,
-    0xEA, 0xAB, 0xAA, 0xA3, 0xB6, 0xE2, 0xEE, 0x45, 0xE0, 0x13, 0x3E, 0x20,
-    0x14, 0x5D, 0x10, 0x42, 0xB5, 0xBB, 0x6A, 0xEF, 0x42, 0xF4, 0x42, 0xC7,
-    0xD0, 0x4F, 0xCB, 0xFA, 0x15, 0x4F, 0x6C, 0xDB, 0xC7, 0x4D, 0x85, 0x86,
-    0x9E, 0x79, 0x1E, 0xD8, 0x05, 0x21, 0xCD, 0x41, 0x1D, 0x3B, 0x4F, 0x65,
-    0x46, 0x26, 0x8D, 0x5B, 0xF2, 0xA1, 0x62, 0xCF, 0x50, 0x62, 0x81, 0x3D,
-    0x6A, 0x47, 0x4B, 0xE4, 0x92, 0x74, 0xCB, 0x69, 0xC3, 0x24, 0x15, 0x7F,
-    0xA3, 0xB6, 0xC7, 0xC1, 0xA0, 0x83, 0x88, 0xFC, 0x9D, 0x48, 0x19, 0xAD,
-    0x00, 0xBF, 0x5B, 0x09, 0x85, 0xB2, 0x92, 0x56, 0x0B, 0x8A, 0x84, 0x47,
-    0xEA, 0xF5, 0x55, 0x0C, 0x2A, 0x8D, 0x42, 0x58, 0x00, 0x0D, 0x82, 0x23,
-    0x74, 0xB1, 0x62, 0x14, 0x41, 0x7E, 0x93, 0x8D, 0x92, 0xF0, 0x72, 0x33,
-    0x61, 0x70, 0x3F, 0x23, 0x3E, 0xF4, 0xAD, 0x1D, 0x60, 0x74, 0xEE, 0xCB,
-    0x59, 0x37, 0xDE, 0x7C, 0xDB, 0x3B, 0x22, 0x6C, 0xF1, 0xEC, 0x5F, 0xD6,
-    0x9E, 0x50, 0xF8, 0x19, 0x84, 0x80, 0x07, 0xA6, 0x6E, 0x32, 0x77, 0xCE,
-    0xA7, 0xF2, 0x85, 0x40, 0xC2, 0x06, 0x0C, 0xC5, 0xAA, 0xA7, 0x69, 0xA9,
-    0x35, 0x97, 0xD9, 0x61, 0x55, 0xD8, 0xEF, 0xE8, 0x84, 0x34, 0x45, 0xC3,
-    0x2E, 0x7A, 0x44, 0x9E, 0xDC, 0xCA, 0x0B, 0x80, 0xFC, 0xAB, 0x04, 0x5A,
-    0xCD, 0x88, 0x55, 0x10, 0xD3, 0xDB, 0x73, 0xDB, 0xC9, 0x9E, 0x1E, 0x0E,
-    0x05, 0x67, 0xD5, 0xFD, 0xD8, 0x38, 0x3E, 0x71, 0x65, 0x34, 0xC4, 0xC5,
-    0x40, 0x43, 0x67, 0xE3, 0x79, 0xDA, 0x5F, 0x67, 0x4A, 0x3D, 0xB0, 0x8F,
-    0xE7, 0x21, 0x3E, 0x15, 0x20, 0xFF, 0x6D, 0xF1, 0x9E, 0xF8, 0x28, 0x3D,
-    0xF7, 0x40, 0x81, 0x94, 0x68, 0x5A, 0x3D, 0xE9, 0xF7, 0xAD, 0x83, 0xDB,
-    0x2B, 0x9F, 0xE3, 0xE6, 0xF7, 0xD4, 0x02, 0x76, 0xF7, 0x20, 0x15, 0x41,
-    0x34, 0x29, 0x69, 0x94, 0x1C, 0x26, 0x4C, 0xF6, 0x6A, 0xF4, 0x20, 0x33,
-    0x71, 0x24, 0x08, 0xD4, 0x68, 0x00, 0xA1, 0xD4, 0x2E, 0x6B, 0xF4, 0xBC,
-    0x46, 0x45, 0x24, 0x97, 0x2E, 0xF6, 0x39, 0x1E, 0xAF, 0x61, 0x00, 0x50,
-    0xB7, 0xD4, 0xB7, 0x43,
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_slow.cc b/third_party/abseil_cpp/absl/random/internal/randen_slow.cc
deleted file mode 100644
index 4e5f3dc1c7b7..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_slow.cc
+++ /dev/null
@@ -1,457 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/randen_slow.h"
-
-#include <cstddef>
-#include <cstdint>
-#include <cstring>
-
-#include "absl/base/attributes.h"
-#include "absl/random/internal/platform.h"
-#include "absl/random/internal/randen_traits.h"
-
-#if ABSL_HAVE_ATTRIBUTE(always_inline) || \
-    (defined(__GNUC__) && !defined(__clang__))
-#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE \
-  __attribute__((always_inline))
-#elif defined(_MSC_VER)
-// We can achieve something similar to attribute((always_inline)) with MSVC by
-// using the __forceinline keyword, however this is not perfect. MSVC is
-// much less aggressive about inlining, and even with the __forceinline keyword.
-#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE __forceinline
-#else
-#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE
-#endif
-
-namespace {
-
-// AES portions based on rijndael-alg-fst.c,
-// https://fastcrypto.org/front/misc/rijndael-alg-fst.c
-//
-// Implementation of
-// http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf
-constexpr uint32_t te0[256] = {
-    0xc66363a5, 0xf87c7c84, 0xee777799, 0xf67b7b8d, 0xfff2f20d, 0xd66b6bbd,
-    0xde6f6fb1, 0x91c5c554, 0x60303050, 0x02010103, 0xce6767a9, 0x562b2b7d,
-    0xe7fefe19, 0xb5d7d762, 0x4dababe6, 0xec76769a, 0x8fcaca45, 0x1f82829d,
-    0x89c9c940, 0xfa7d7d87, 0xeffafa15, 0xb25959eb, 0x8e4747c9, 0xfbf0f00b,
-    0x41adadec, 0xb3d4d467, 0x5fa2a2fd, 0x45afafea, 0x239c9cbf, 0x53a4a4f7,
-    0xe4727296, 0x9bc0c05b, 0x75b7b7c2, 0xe1fdfd1c, 0x3d9393ae, 0x4c26266a,
-    0x6c36365a, 0x7e3f3f41, 0xf5f7f702, 0x83cccc4f, 0x6834345c, 0x51a5a5f4,
-    0xd1e5e534, 0xf9f1f108, 0xe2717193, 0xabd8d873, 0x62313153, 0x2a15153f,
-    0x0804040c, 0x95c7c752, 0x46232365, 0x9dc3c35e, 0x30181828, 0x379696a1,
-    0x0a05050f, 0x2f9a9ab5, 0x0e070709, 0x24121236, 0x1b80809b, 0xdfe2e23d,
-    0xcdebeb26, 0x4e272769, 0x7fb2b2cd, 0xea75759f, 0x1209091b, 0x1d83839e,
-    0x582c2c74, 0x341a1a2e, 0x361b1b2d, 0xdc6e6eb2, 0xb45a5aee, 0x5ba0a0fb,
-    0xa45252f6, 0x763b3b4d, 0xb7d6d661, 0x7db3b3ce, 0x5229297b, 0xdde3e33e,
-    0x5e2f2f71, 0x13848497, 0xa65353f5, 0xb9d1d168, 0x00000000, 0xc1eded2c,
-    0x40202060, 0xe3fcfc1f, 0x79b1b1c8, 0xb65b5bed, 0xd46a6abe, 0x8dcbcb46,
-    0x67bebed9, 0x7239394b, 0x944a4ade, 0x984c4cd4, 0xb05858e8, 0x85cfcf4a,
-    0xbbd0d06b, 0xc5efef2a, 0x4faaaae5, 0xedfbfb16, 0x864343c5, 0x9a4d4dd7,
-    0x66333355, 0x11858594, 0x8a4545cf, 0xe9f9f910, 0x04020206, 0xfe7f7f81,
-    0xa05050f0, 0x783c3c44, 0x259f9fba, 0x4ba8a8e3, 0xa25151f3, 0x5da3a3fe,
-    0x804040c0, 0x058f8f8a, 0x3f9292ad, 0x219d9dbc, 0x70383848, 0xf1f5f504,
-    0x63bcbcdf, 0x77b6b6c1, 0xafdada75, 0x42212163, 0x20101030, 0xe5ffff1a,
-    0xfdf3f30e, 0xbfd2d26d, 0x81cdcd4c, 0x180c0c14, 0x26131335, 0xc3ecec2f,
-    0xbe5f5fe1, 0x359797a2, 0x884444cc, 0x2e171739, 0x93c4c457, 0x55a7a7f2,
-    0xfc7e7e82, 0x7a3d3d47, 0xc86464ac, 0xba5d5de7, 0x3219192b, 0xe6737395,
-    0xc06060a0, 0x19818198, 0x9e4f4fd1, 0xa3dcdc7f, 0x44222266, 0x542a2a7e,
-    0x3b9090ab, 0x0b888883, 0x8c4646ca, 0xc7eeee29, 0x6bb8b8d3, 0x2814143c,
-    0xa7dede79, 0xbc5e5ee2, 0x160b0b1d, 0xaddbdb76, 0xdbe0e03b, 0x64323256,
-    0x743a3a4e, 0x140a0a1e, 0x924949db, 0x0c06060a, 0x4824246c, 0xb85c5ce4,
-    0x9fc2c25d, 0xbdd3d36e, 0x43acacef, 0xc46262a6, 0x399191a8, 0x319595a4,
-    0xd3e4e437, 0xf279798b, 0xd5e7e732, 0x8bc8c843, 0x6e373759, 0xda6d6db7,
-    0x018d8d8c, 0xb1d5d564, 0x9c4e4ed2, 0x49a9a9e0, 0xd86c6cb4, 0xac5656fa,
-    0xf3f4f407, 0xcfeaea25, 0xca6565af, 0xf47a7a8e, 0x47aeaee9, 0x10080818,
-    0x6fbabad5, 0xf0787888, 0x4a25256f, 0x5c2e2e72, 0x381c1c24, 0x57a6a6f1,
-    0x73b4b4c7, 0x97c6c651, 0xcbe8e823, 0xa1dddd7c, 0xe874749c, 0x3e1f1f21,
-    0x964b4bdd, 0x61bdbddc, 0x0d8b8b86, 0x0f8a8a85, 0xe0707090, 0x7c3e3e42,
-    0x71b5b5c4, 0xcc6666aa, 0x904848d8, 0x06030305, 0xf7f6f601, 0x1c0e0e12,
-    0xc26161a3, 0x6a35355f, 0xae5757f9, 0x69b9b9d0, 0x17868691, 0x99c1c158,
-    0x3a1d1d27, 0x279e9eb9, 0xd9e1e138, 0xebf8f813, 0x2b9898b3, 0x22111133,
-    0xd26969bb, 0xa9d9d970, 0x078e8e89, 0x339494a7, 0x2d9b9bb6, 0x3c1e1e22,
-    0x15878792, 0xc9e9e920, 0x87cece49, 0xaa5555ff, 0x50282878, 0xa5dfdf7a,
-    0x038c8c8f, 0x59a1a1f8, 0x09898980, 0x1a0d0d17, 0x65bfbfda, 0xd7e6e631,
-    0x844242c6, 0xd06868b8, 0x824141c3, 0x299999b0, 0x5a2d2d77, 0x1e0f0f11,
-    0x7bb0b0cb, 0xa85454fc, 0x6dbbbbd6, 0x2c16163a,
-};
-
-constexpr uint32_t te1[256] = {
-    0xa5c66363, 0x84f87c7c, 0x99ee7777, 0x8df67b7b, 0x0dfff2f2, 0xbdd66b6b,
-    0xb1de6f6f, 0x5491c5c5, 0x50603030, 0x03020101, 0xa9ce6767, 0x7d562b2b,
-    0x19e7fefe, 0x62b5d7d7, 0xe64dabab, 0x9aec7676, 0x458fcaca, 0x9d1f8282,
-    0x4089c9c9, 0x87fa7d7d, 0x15effafa, 0xebb25959, 0xc98e4747, 0x0bfbf0f0,
-    0xec41adad, 0x67b3d4d4, 0xfd5fa2a2, 0xea45afaf, 0xbf239c9c, 0xf753a4a4,
-    0x96e47272, 0x5b9bc0c0, 0xc275b7b7, 0x1ce1fdfd, 0xae3d9393, 0x6a4c2626,
-    0x5a6c3636, 0x417e3f3f, 0x02f5f7f7, 0x4f83cccc, 0x5c683434, 0xf451a5a5,
-    0x34d1e5e5, 0x08f9f1f1, 0x93e27171, 0x73abd8d8, 0x53623131, 0x3f2a1515,
-    0x0c080404, 0x5295c7c7, 0x65462323, 0x5e9dc3c3, 0x28301818, 0xa1379696,
-    0x0f0a0505, 0xb52f9a9a, 0x090e0707, 0x36241212, 0x9b1b8080, 0x3ddfe2e2,
-    0x26cdebeb, 0x694e2727, 0xcd7fb2b2, 0x9fea7575, 0x1b120909, 0x9e1d8383,
-    0x74582c2c, 0x2e341a1a, 0x2d361b1b, 0xb2dc6e6e, 0xeeb45a5a, 0xfb5ba0a0,
-    0xf6a45252, 0x4d763b3b, 0x61b7d6d6, 0xce7db3b3, 0x7b522929, 0x3edde3e3,
-    0x715e2f2f, 0x97138484, 0xf5a65353, 0x68b9d1d1, 0x00000000, 0x2cc1eded,
-    0x60402020, 0x1fe3fcfc, 0xc879b1b1, 0xedb65b5b, 0xbed46a6a, 0x468dcbcb,
-    0xd967bebe, 0x4b723939, 0xde944a4a, 0xd4984c4c, 0xe8b05858, 0x4a85cfcf,
-    0x6bbbd0d0, 0x2ac5efef, 0xe54faaaa, 0x16edfbfb, 0xc5864343, 0xd79a4d4d,
-    0x55663333, 0x94118585, 0xcf8a4545, 0x10e9f9f9, 0x06040202, 0x81fe7f7f,
-    0xf0a05050, 0x44783c3c, 0xba259f9f, 0xe34ba8a8, 0xf3a25151, 0xfe5da3a3,
-    0xc0804040, 0x8a058f8f, 0xad3f9292, 0xbc219d9d, 0x48703838, 0x04f1f5f5,
-    0xdf63bcbc, 0xc177b6b6, 0x75afdada, 0x63422121, 0x30201010, 0x1ae5ffff,
-    0x0efdf3f3, 0x6dbfd2d2, 0x4c81cdcd, 0x14180c0c, 0x35261313, 0x2fc3ecec,
-    0xe1be5f5f, 0xa2359797, 0xcc884444, 0x392e1717, 0x5793c4c4, 0xf255a7a7,
-    0x82fc7e7e, 0x477a3d3d, 0xacc86464, 0xe7ba5d5d, 0x2b321919, 0x95e67373,
-    0xa0c06060, 0x98198181, 0xd19e4f4f, 0x7fa3dcdc, 0x66442222, 0x7e542a2a,
-    0xab3b9090, 0x830b8888, 0xca8c4646, 0x29c7eeee, 0xd36bb8b8, 0x3c281414,
-    0x79a7dede, 0xe2bc5e5e, 0x1d160b0b, 0x76addbdb, 0x3bdbe0e0, 0x56643232,
-    0x4e743a3a, 0x1e140a0a, 0xdb924949, 0x0a0c0606, 0x6c482424, 0xe4b85c5c,
-    0x5d9fc2c2, 0x6ebdd3d3, 0xef43acac, 0xa6c46262, 0xa8399191, 0xa4319595,
-    0x37d3e4e4, 0x8bf27979, 0x32d5e7e7, 0x438bc8c8, 0x596e3737, 0xb7da6d6d,
-    0x8c018d8d, 0x64b1d5d5, 0xd29c4e4e, 0xe049a9a9, 0xb4d86c6c, 0xfaac5656,
-    0x07f3f4f4, 0x25cfeaea, 0xafca6565, 0x8ef47a7a, 0xe947aeae, 0x18100808,
-    0xd56fbaba, 0x88f07878, 0x6f4a2525, 0x725c2e2e, 0x24381c1c, 0xf157a6a6,
-    0xc773b4b4, 0x5197c6c6, 0x23cbe8e8, 0x7ca1dddd, 0x9ce87474, 0x213e1f1f,
-    0xdd964b4b, 0xdc61bdbd, 0x860d8b8b, 0x850f8a8a, 0x90e07070, 0x427c3e3e,
-    0xc471b5b5, 0xaacc6666, 0xd8904848, 0x05060303, 0x01f7f6f6, 0x121c0e0e,
-    0xa3c26161, 0x5f6a3535, 0xf9ae5757, 0xd069b9b9, 0x91178686, 0x5899c1c1,
-    0x273a1d1d, 0xb9279e9e, 0x38d9e1e1, 0x13ebf8f8, 0xb32b9898, 0x33221111,
-    0xbbd26969, 0x70a9d9d9, 0x89078e8e, 0xa7339494, 0xb62d9b9b, 0x223c1e1e,
-    0x92158787, 0x20c9e9e9, 0x4987cece, 0xffaa5555, 0x78502828, 0x7aa5dfdf,
-    0x8f038c8c, 0xf859a1a1, 0x80098989, 0x171a0d0d, 0xda65bfbf, 0x31d7e6e6,
-    0xc6844242, 0xb8d06868, 0xc3824141, 0xb0299999, 0x775a2d2d, 0x111e0f0f,
-    0xcb7bb0b0, 0xfca85454, 0xd66dbbbb, 0x3a2c1616,
-};
-
-constexpr uint32_t te2[256] = {
-    0x63a5c663, 0x7c84f87c, 0x7799ee77, 0x7b8df67b, 0xf20dfff2, 0x6bbdd66b,
-    0x6fb1de6f, 0xc55491c5, 0x30506030, 0x01030201, 0x67a9ce67, 0x2b7d562b,
-    0xfe19e7fe, 0xd762b5d7, 0xabe64dab, 0x769aec76, 0xca458fca, 0x829d1f82,
-    0xc94089c9, 0x7d87fa7d, 0xfa15effa, 0x59ebb259, 0x47c98e47, 0xf00bfbf0,
-    0xadec41ad, 0xd467b3d4, 0xa2fd5fa2, 0xafea45af, 0x9cbf239c, 0xa4f753a4,
-    0x7296e472, 0xc05b9bc0, 0xb7c275b7, 0xfd1ce1fd, 0x93ae3d93, 0x266a4c26,
-    0x365a6c36, 0x3f417e3f, 0xf702f5f7, 0xcc4f83cc, 0x345c6834, 0xa5f451a5,
-    0xe534d1e5, 0xf108f9f1, 0x7193e271, 0xd873abd8, 0x31536231, 0x153f2a15,
-    0x040c0804, 0xc75295c7, 0x23654623, 0xc35e9dc3, 0x18283018, 0x96a13796,
-    0x050f0a05, 0x9ab52f9a, 0x07090e07, 0x12362412, 0x809b1b80, 0xe23ddfe2,
-    0xeb26cdeb, 0x27694e27, 0xb2cd7fb2, 0x759fea75, 0x091b1209, 0x839e1d83,
-    0x2c74582c, 0x1a2e341a, 0x1b2d361b, 0x6eb2dc6e, 0x5aeeb45a, 0xa0fb5ba0,
-    0x52f6a452, 0x3b4d763b, 0xd661b7d6, 0xb3ce7db3, 0x297b5229, 0xe33edde3,
-    0x2f715e2f, 0x84971384, 0x53f5a653, 0xd168b9d1, 0x00000000, 0xed2cc1ed,
-    0x20604020, 0xfc1fe3fc, 0xb1c879b1, 0x5bedb65b, 0x6abed46a, 0xcb468dcb,
-    0xbed967be, 0x394b7239, 0x4ade944a, 0x4cd4984c, 0x58e8b058, 0xcf4a85cf,
-    0xd06bbbd0, 0xef2ac5ef, 0xaae54faa, 0xfb16edfb, 0x43c58643, 0x4dd79a4d,
-    0x33556633, 0x85941185, 0x45cf8a45, 0xf910e9f9, 0x02060402, 0x7f81fe7f,
-    0x50f0a050, 0x3c44783c, 0x9fba259f, 0xa8e34ba8, 0x51f3a251, 0xa3fe5da3,
-    0x40c08040, 0x8f8a058f, 0x92ad3f92, 0x9dbc219d, 0x38487038, 0xf504f1f5,
-    0xbcdf63bc, 0xb6c177b6, 0xda75afda, 0x21634221, 0x10302010, 0xff1ae5ff,
-    0xf30efdf3, 0xd26dbfd2, 0xcd4c81cd, 0x0c14180c, 0x13352613, 0xec2fc3ec,
-    0x5fe1be5f, 0x97a23597, 0x44cc8844, 0x17392e17, 0xc45793c4, 0xa7f255a7,
-    0x7e82fc7e, 0x3d477a3d, 0x64acc864, 0x5de7ba5d, 0x192b3219, 0x7395e673,
-    0x60a0c060, 0x81981981, 0x4fd19e4f, 0xdc7fa3dc, 0x22664422, 0x2a7e542a,
-    0x90ab3b90, 0x88830b88, 0x46ca8c46, 0xee29c7ee, 0xb8d36bb8, 0x143c2814,
-    0xde79a7de, 0x5ee2bc5e, 0x0b1d160b, 0xdb76addb, 0xe03bdbe0, 0x32566432,
-    0x3a4e743a, 0x0a1e140a, 0x49db9249, 0x060a0c06, 0x246c4824, 0x5ce4b85c,
-    0xc25d9fc2, 0xd36ebdd3, 0xacef43ac, 0x62a6c462, 0x91a83991, 0x95a43195,
-    0xe437d3e4, 0x798bf279, 0xe732d5e7, 0xc8438bc8, 0x37596e37, 0x6db7da6d,
-    0x8d8c018d, 0xd564b1d5, 0x4ed29c4e, 0xa9e049a9, 0x6cb4d86c, 0x56faac56,
-    0xf407f3f4, 0xea25cfea, 0x65afca65, 0x7a8ef47a, 0xaee947ae, 0x08181008,
-    0xbad56fba, 0x7888f078, 0x256f4a25, 0x2e725c2e, 0x1c24381c, 0xa6f157a6,
-    0xb4c773b4, 0xc65197c6, 0xe823cbe8, 0xdd7ca1dd, 0x749ce874, 0x1f213e1f,
-    0x4bdd964b, 0xbddc61bd, 0x8b860d8b, 0x8a850f8a, 0x7090e070, 0x3e427c3e,
-    0xb5c471b5, 0x66aacc66, 0x48d89048, 0x03050603, 0xf601f7f6, 0x0e121c0e,
-    0x61a3c261, 0x355f6a35, 0x57f9ae57, 0xb9d069b9, 0x86911786, 0xc15899c1,
-    0x1d273a1d, 0x9eb9279e, 0xe138d9e1, 0xf813ebf8, 0x98b32b98, 0x11332211,
-    0x69bbd269, 0xd970a9d9, 0x8e89078e, 0x94a73394, 0x9bb62d9b, 0x1e223c1e,
-    0x87921587, 0xe920c9e9, 0xce4987ce, 0x55ffaa55, 0x28785028, 0xdf7aa5df,
-    0x8c8f038c, 0xa1f859a1, 0x89800989, 0x0d171a0d, 0xbfda65bf, 0xe631d7e6,
-    0x42c68442, 0x68b8d068, 0x41c38241, 0x99b02999, 0x2d775a2d, 0x0f111e0f,
-    0xb0cb7bb0, 0x54fca854, 0xbbd66dbb, 0x163a2c16,
-};
-
-constexpr uint32_t te3[256] = {
-    0x6363a5c6, 0x7c7c84f8, 0x777799ee, 0x7b7b8df6, 0xf2f20dff, 0x6b6bbdd6,
-    0x6f6fb1de, 0xc5c55491, 0x30305060, 0x01010302, 0x6767a9ce, 0x2b2b7d56,
-    0xfefe19e7, 0xd7d762b5, 0xababe64d, 0x76769aec, 0xcaca458f, 0x82829d1f,
-    0xc9c94089, 0x7d7d87fa, 0xfafa15ef, 0x5959ebb2, 0x4747c98e, 0xf0f00bfb,
-    0xadadec41, 0xd4d467b3, 0xa2a2fd5f, 0xafafea45, 0x9c9cbf23, 0xa4a4f753,
-    0x727296e4, 0xc0c05b9b, 0xb7b7c275, 0xfdfd1ce1, 0x9393ae3d, 0x26266a4c,
-    0x36365a6c, 0x3f3f417e, 0xf7f702f5, 0xcccc4f83, 0x34345c68, 0xa5a5f451,
-    0xe5e534d1, 0xf1f108f9, 0x717193e2, 0xd8d873ab, 0x31315362, 0x15153f2a,
-    0x04040c08, 0xc7c75295, 0x23236546, 0xc3c35e9d, 0x18182830, 0x9696a137,
-    0x05050f0a, 0x9a9ab52f, 0x0707090e, 0x12123624, 0x80809b1b, 0xe2e23ddf,
-    0xebeb26cd, 0x2727694e, 0xb2b2cd7f, 0x75759fea, 0x09091b12, 0x83839e1d,
-    0x2c2c7458, 0x1a1a2e34, 0x1b1b2d36, 0x6e6eb2dc, 0x5a5aeeb4, 0xa0a0fb5b,
-    0x5252f6a4, 0x3b3b4d76, 0xd6d661b7, 0xb3b3ce7d, 0x29297b52, 0xe3e33edd,
-    0x2f2f715e, 0x84849713, 0x5353f5a6, 0xd1d168b9, 0x00000000, 0xeded2cc1,
-    0x20206040, 0xfcfc1fe3, 0xb1b1c879, 0x5b5bedb6, 0x6a6abed4, 0xcbcb468d,
-    0xbebed967, 0x39394b72, 0x4a4ade94, 0x4c4cd498, 0x5858e8b0, 0xcfcf4a85,
-    0xd0d06bbb, 0xefef2ac5, 0xaaaae54f, 0xfbfb16ed, 0x4343c586, 0x4d4dd79a,
-    0x33335566, 0x85859411, 0x4545cf8a, 0xf9f910e9, 0x02020604, 0x7f7f81fe,
-    0x5050f0a0, 0x3c3c4478, 0x9f9fba25, 0xa8a8e34b, 0x5151f3a2, 0xa3a3fe5d,
-    0x4040c080, 0x8f8f8a05, 0x9292ad3f, 0x9d9dbc21, 0x38384870, 0xf5f504f1,
-    0xbcbcdf63, 0xb6b6c177, 0xdada75af, 0x21216342, 0x10103020, 0xffff1ae5,
-    0xf3f30efd, 0xd2d26dbf, 0xcdcd4c81, 0x0c0c1418, 0x13133526, 0xecec2fc3,
-    0x5f5fe1be, 0x9797a235, 0x4444cc88, 0x1717392e, 0xc4c45793, 0xa7a7f255,
-    0x7e7e82fc, 0x3d3d477a, 0x6464acc8, 0x5d5de7ba, 0x19192b32, 0x737395e6,
-    0x6060a0c0, 0x81819819, 0x4f4fd19e, 0xdcdc7fa3, 0x22226644, 0x2a2a7e54,
-    0x9090ab3b, 0x8888830b, 0x4646ca8c, 0xeeee29c7, 0xb8b8d36b, 0x14143c28,
-    0xdede79a7, 0x5e5ee2bc, 0x0b0b1d16, 0xdbdb76ad, 0xe0e03bdb, 0x32325664,
-    0x3a3a4e74, 0x0a0a1e14, 0x4949db92, 0x06060a0c, 0x24246c48, 0x5c5ce4b8,
-    0xc2c25d9f, 0xd3d36ebd, 0xacacef43, 0x6262a6c4, 0x9191a839, 0x9595a431,
-    0xe4e437d3, 0x79798bf2, 0xe7e732d5, 0xc8c8438b, 0x3737596e, 0x6d6db7da,
-    0x8d8d8c01, 0xd5d564b1, 0x4e4ed29c, 0xa9a9e049, 0x6c6cb4d8, 0x5656faac,
-    0xf4f407f3, 0xeaea25cf, 0x6565afca, 0x7a7a8ef4, 0xaeaee947, 0x08081810,
-    0xbabad56f, 0x787888f0, 0x25256f4a, 0x2e2e725c, 0x1c1c2438, 0xa6a6f157,
-    0xb4b4c773, 0xc6c65197, 0xe8e823cb, 0xdddd7ca1, 0x74749ce8, 0x1f1f213e,
-    0x4b4bdd96, 0xbdbddc61, 0x8b8b860d, 0x8a8a850f, 0x707090e0, 0x3e3e427c,
-    0xb5b5c471, 0x6666aacc, 0x4848d890, 0x03030506, 0xf6f601f7, 0x0e0e121c,
-    0x6161a3c2, 0x35355f6a, 0x5757f9ae, 0xb9b9d069, 0x86869117, 0xc1c15899,
-    0x1d1d273a, 0x9e9eb927, 0xe1e138d9, 0xf8f813eb, 0x9898b32b, 0x11113322,
-    0x6969bbd2, 0xd9d970a9, 0x8e8e8907, 0x9494a733, 0x9b9bb62d, 0x1e1e223c,
-    0x87879215, 0xe9e920c9, 0xcece4987, 0x5555ffaa, 0x28287850, 0xdfdf7aa5,
-    0x8c8c8f03, 0xa1a1f859, 0x89898009, 0x0d0d171a, 0xbfbfda65, 0xe6e631d7,
-    0x4242c684, 0x6868b8d0, 0x4141c382, 0x9999b029, 0x2d2d775a, 0x0f0f111e,
-    0xb0b0cb7b, 0x5454fca8, 0xbbbbd66d, 0x16163a2c,
-};
-
-// Software implementation of the Vector128 class, using uint32_t
-// as an underlying vector register.
-struct alignas(16) Vector128 {
-  uint32_t s[4];
-};
-
-inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
-Vector128Load(const void* from) {
-  Vector128 result;
-  const uint8_t* src = reinterpret_cast<const uint8_t*>(from);
-  result.s[0] = static_cast<uint32_t>(src[0]) << 24 |
-                static_cast<uint32_t>(src[1]) << 16 |
-                static_cast<uint32_t>(src[2]) << 8 |
-                static_cast<uint32_t>(src[3]);
-  result.s[1] = static_cast<uint32_t>(src[4]) << 24 |
-                static_cast<uint32_t>(src[5]) << 16 |
-                static_cast<uint32_t>(src[6]) << 8 |
-                static_cast<uint32_t>(src[7]);
-  result.s[2] = static_cast<uint32_t>(src[8]) << 24 |
-                static_cast<uint32_t>(src[9]) << 16 |
-                static_cast<uint32_t>(src[10]) << 8 |
-                static_cast<uint32_t>(src[11]);
-  result.s[3] = static_cast<uint32_t>(src[12]) << 24 |
-                static_cast<uint32_t>(src[13]) << 16 |
-                static_cast<uint32_t>(src[14]) << 8 |
-                static_cast<uint32_t>(src[15]);
-  return result;
-}
-
-inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void Vector128Store(
-    const Vector128& v, void* to) {
-  uint8_t* dst = reinterpret_cast<uint8_t*>(to);
-  dst[0] = static_cast<uint8_t>(v.s[0] >> 24);
-  dst[1] = static_cast<uint8_t>(v.s[0] >> 16);
-  dst[2] = static_cast<uint8_t>(v.s[0] >> 8);
-  dst[3] = static_cast<uint8_t>(v.s[0]);
-  dst[4] = static_cast<uint8_t>(v.s[1] >> 24);
-  dst[5] = static_cast<uint8_t>(v.s[1] >> 16);
-  dst[6] = static_cast<uint8_t>(v.s[1] >> 8);
-  dst[7] = static_cast<uint8_t>(v.s[1]);
-  dst[8] = static_cast<uint8_t>(v.s[2] >> 24);
-  dst[9] = static_cast<uint8_t>(v.s[2] >> 16);
-  dst[10] = static_cast<uint8_t>(v.s[2] >> 8);
-  dst[11] = static_cast<uint8_t>(v.s[2]);
-  dst[12] = static_cast<uint8_t>(v.s[3] >> 24);
-  dst[13] = static_cast<uint8_t>(v.s[3] >> 16);
-  dst[14] = static_cast<uint8_t>(v.s[3] >> 8);
-  dst[15] = static_cast<uint8_t>(v.s[3]);
-}
-
-// One round of AES. "round_key" is a public constant for breaking the
-// symmetry of AES (ensures previously equal columns differ afterwards).
-inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
-AesRound(const Vector128& state, const Vector128& round_key) {
-  Vector128 result;
-  result.s[0] = round_key.s[0] ^                  //
-                te0[uint8_t(state.s[0] >> 24)] ^  //
-                te1[uint8_t(state.s[1] >> 16)] ^  //
-                te2[uint8_t(state.s[2] >> 8)] ^   //
-                te3[uint8_t(state.s[3])];
-  result.s[1] = round_key.s[1] ^                  //
-                te0[uint8_t(state.s[1] >> 24)] ^  //
-                te1[uint8_t(state.s[2] >> 16)] ^  //
-                te2[uint8_t(state.s[3] >> 8)] ^   //
-                te3[uint8_t(state.s[0])];
-  result.s[2] = round_key.s[2] ^                  //
-                te0[uint8_t(state.s[2] >> 24)] ^  //
-                te1[uint8_t(state.s[3] >> 16)] ^  //
-                te2[uint8_t(state.s[0] >> 8)] ^   //
-                te3[uint8_t(state.s[1])];
-  result.s[3] = round_key.s[3] ^                  //
-                te0[uint8_t(state.s[3] >> 24)] ^  //
-                te1[uint8_t(state.s[0] >> 16)] ^  //
-                te2[uint8_t(state.s[1] >> 8)] ^   //
-                te3[uint8_t(state.s[2])];
-  return result;
-}
-
-using ::absl::random_internal::RandenTraits;
-
-// Randen operates on 128-bit vectors.
-struct alignas(16) u64x2 {
-  uint64_t data[2];
-};
-
-// The improved Feistel block shuffle function for 16 blocks.
-inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void BlockShuffle(
-    u64x2* state) {
-  static_assert(RandenTraits::kFeistelBlocks == 16,
-                "Feistel block shuffle only works for 16 blocks.");
-
-  constexpr size_t shuffle[RandenTraits::kFeistelBlocks] = {
-      7, 2, 13, 4, 11, 8, 3, 6, 15, 0, 9, 10, 1, 14, 5, 12};
-
-  // The fully unrolled loop without the memcpy improves the speed by about
-  // 30% over the equivalent:
-#if 0
-  u64x2 source[RandenTraits::kFeistelBlocks];
-  std::memcpy(source, state, sizeof(source));
-  for (size_t i = 0; i < RandenTraits::kFeistelBlocks; i++) {
-    const u64x2 v0 = source[shuffle[i]];
-    state[i] = v0;
-  }
-  return;
-#endif
-
-  const u64x2 v0 = state[shuffle[0]];
-  const u64x2 v1 = state[shuffle[1]];
-  const u64x2 v2 = state[shuffle[2]];
-  const u64x2 v3 = state[shuffle[3]];
-  const u64x2 v4 = state[shuffle[4]];
-  const u64x2 v5 = state[shuffle[5]];
-  const u64x2 v6 = state[shuffle[6]];
-  const u64x2 v7 = state[shuffle[7]];
-  const u64x2 w0 = state[shuffle[8]];
-  const u64x2 w1 = state[shuffle[9]];
-  const u64x2 w2 = state[shuffle[10]];
-  const u64x2 w3 = state[shuffle[11]];
-  const u64x2 w4 = state[shuffle[12]];
-  const u64x2 w5 = state[shuffle[13]];
-  const u64x2 w6 = state[shuffle[14]];
-  const u64x2 w7 = state[shuffle[15]];
-  state[0] = v0;
-  state[1] = v1;
-  state[2] = v2;
-  state[3] = v3;
-  state[4] = v4;
-  state[5] = v5;
-  state[6] = v6;
-  state[7] = v7;
-  state[8] = w0;
-  state[9] = w1;
-  state[10] = w2;
-  state[11] = w3;
-  state[12] = w4;
-  state[13] = w5;
-  state[14] = w6;
-  state[15] = w7;
-}
-
-// Feistel round function using two AES subrounds. Very similar to F()
-// from Simpira v2, but with independent subround keys. Uses 17 AES rounds
-// per 16 bytes (vs. 10 for AES-CTR). Computing eight round functions in
-// parallel hides the 7-cycle AESNI latency on HSW. Note that the Feistel
-// XORs are 'free' (included in the second AES instruction).
-inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE const u64x2* FeistelRound(
-    u64x2* ABSL_RANDOM_INTERNAL_RESTRICT state,
-    const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
-  for (size_t branch = 0; branch < RandenTraits::kFeistelBlocks; branch += 4) {
-    const Vector128 s0 = Vector128Load(state + branch);
-    const Vector128 s1 = Vector128Load(state + branch + 1);
-    const Vector128 f0 = AesRound(s0, Vector128Load(keys));
-    keys++;
-    const Vector128 o1 = AesRound(f0, s1);
-    Vector128Store(o1, state + branch + 1);
-
-    // Manually unroll this loop once. about 10% better than not unrolled.
-    const Vector128 s2 = Vector128Load(state + branch + 2);
-    const Vector128 s3 = Vector128Load(state + branch + 3);
-    const Vector128 f2 = AesRound(s2, Vector128Load(keys));
-    keys++;
-    const Vector128 o3 = AesRound(f2, s3);
-    Vector128Store(o3, state + branch + 3);
-  }
-  return keys;
-}
-
-// Cryptographic permutation based via type-2 Generalized Feistel Network.
-// Indistinguishable from ideal by chosen-ciphertext adversaries using less than
-// 2^64 queries if the round function is a PRF. This is similar to the b=8 case
-// of Simpira v2, but more efficient than its generic construction for b=16.
-inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void Permute(
-    u64x2* state, const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
-  for (size_t round = 0; round < RandenTraits::kFeistelRounds; ++round) {
-    keys = FeistelRound(state, keys);
-    BlockShuffle(state);
-  }
-}
-
-}  // namespace
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-const void* RandenSlow::GetKeys() {
-  // Round keys for one AES per Feistel round and branch.
-  // The canonical implementation uses first digits of Pi.
-  return kRandenRoundKeys;
-}
-
-void RandenSlow::Absorb(const void* seed_void, void* state_void) {
-  auto* state =
-      reinterpret_cast<uint64_t * ABSL_RANDOM_INTERNAL_RESTRICT>(state_void);
-  const auto* seed =
-      reinterpret_cast<const uint64_t * ABSL_RANDOM_INTERNAL_RESTRICT>(
-          seed_void);
-
-  constexpr size_t kCapacityBlocks =
-      RandenTraits::kCapacityBytes / sizeof(uint64_t);
-  static_assert(
-      kCapacityBlocks * sizeof(uint64_t) == RandenTraits::kCapacityBytes,
-      "Not i*V");
-
-  for (size_t i = kCapacityBlocks;
-       i < RandenTraits::kStateBytes / sizeof(uint64_t); ++i) {
-    state[i] ^= seed[i - kCapacityBlocks];
-  }
-}
-
-void RandenSlow::Generate(const void* keys_void, void* state_void) {
-  static_assert(RandenTraits::kCapacityBytes == sizeof(u64x2),
-                "Capacity mismatch");
-
-  auto* state = reinterpret_cast<u64x2*>(state_void);
-  const auto* keys = reinterpret_cast<const u64x2*>(keys_void);
-
-  const u64x2 prev_inner = state[0];
-
-  Permute(state, keys);
-
-  // Ensure backtracking resistance.
-  state[0].data[0] ^= prev_inner.data[0];
-  state[0].data[1] ^= prev_inner.data[1];
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_slow.h b/third_party/abseil_cpp/absl/random/internal/randen_slow.h
deleted file mode 100644
index b6f137eb94b1..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_slow.h
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
-#define ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
-
-#include <cstddef>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// RANDen = RANDom generator or beetroots in Swiss German.
-// RandenSlow implements the basic state manipulation methods for
-// architectures lacking AES hardware acceleration intrinsics.
-class RandenSlow {
- public:
-  static void Generate(const void* keys, void* state_void);
-  static void Absorb(const void* seed_void, void* state_void);
-  static const void* GetKeys();
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_slow_test.cc b/third_party/abseil_cpp/absl/random/internal/randen_slow_test.cc
deleted file mode 100644
index 4a5358370586..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_slow_test.cc
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/randen_slow.h"
-
-#include <cstring>
-
-#include "gtest/gtest.h"
-#include "absl/random/internal/randen_traits.h"
-
-namespace {
-
-using absl::random_internal::RandenSlow;
-using absl::random_internal::RandenTraits;
-
-// Local state parameters.
-constexpr size_t kSeedBytes =
-    RandenTraits::kStateBytes - RandenTraits::kCapacityBytes;
-constexpr size_t kStateSizeT = RandenTraits::kStateBytes / sizeof(uint64_t);
-constexpr size_t kSeedSizeT = kSeedBytes / sizeof(uint32_t);
-
-struct alignas(16) randen {
-  uint64_t state[kStateSizeT];
-  uint32_t seed[kSeedSizeT];
-};
-
-TEST(RandenSlowTest, Default) {
-  constexpr uint64_t kGolden[] = {
-      0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
-      0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
-      0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
-      0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
-      0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
-      0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
-      0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
-      0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
-      0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
-      0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
-      0x026ff374c101da7e, 0x811ef0821c3de851,
-  };
-
-  alignas(16) randen d;
-  std::memset(d.state, 0, sizeof(d.state));
-  RandenSlow::Generate(RandenSlow::GetKeys(), d.state);
-
-  uint64_t* id = d.state;
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, *id++);
-  }
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_test.cc b/third_party/abseil_cpp/absl/random/internal/randen_test.cc
deleted file mode 100644
index c186fe0d686b..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_test.cc
+++ /dev/null
@@ -1,70 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/randen.h"
-
-#include <cstring>
-
-#include "gtest/gtest.h"
-#include "absl/meta/type_traits.h"
-
-namespace {
-
-using absl::random_internal::Randen;
-
-// Local state parameters.
-constexpr size_t kStateSizeT = Randen::kStateBytes / sizeof(uint64_t);
-
-TEST(RandenTest, CopyAndMove) {
-  static_assert(std::is_copy_constructible<Randen>::value,
-                "Randen must be copy constructible");
-
-  static_assert(absl::is_copy_assignable<Randen>::value,
-                "Randen must be copy assignable");
-
-  static_assert(std::is_move_constructible<Randen>::value,
-                "Randen must be move constructible");
-
-  static_assert(absl::is_move_assignable<Randen>::value,
-                "Randen must be move assignable");
-}
-
-TEST(RandenTest, Default) {
-  constexpr uint64_t kGolden[] = {
-      0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
-      0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
-      0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
-      0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
-      0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
-      0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
-      0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
-      0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
-      0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
-      0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
-      0x026ff374c101da7e, 0x811ef0821c3de851,
-  };
-
-  alignas(16) uint64_t state[kStateSizeT];
-  std::memset(state, 0, sizeof(state));
-
-  Randen r;
-  r.Generate(state);
-
-  auto id = std::begin(state);
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(elem, *id++);
-  }
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_traits.h b/third_party/abseil_cpp/absl/random/internal/randen_traits.h
deleted file mode 100644
index 53caa936140a..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/randen_traits.h
+++ /dev/null
@@ -1,88 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_
-#define ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_
-
-// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
-// symbols from arbitrary system and other headers, since it may be built
-// with different flags from other targets, using different levels of
-// optimization, potentially introducing ODR violations.
-
-#include <cstddef>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// RANDen = RANDom generator or beetroots in Swiss German.
-// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
-// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
-//
-// High-level summary:
-// 1) Reverie (see "A Robust and Sponge-Like PRNG with Improved Efficiency") is
-//    a sponge-like random generator that requires a cryptographic permutation.
-//    It improves upon "Provably Robust Sponge-Based PRNGs and KDFs" by
-//    achieving backtracking resistance with only one Permute() per buffer.
-//
-// 2) "Simpira v2: A Family of Efficient Permutations Using the AES Round
-//    Function" constructs up to 1024-bit permutations using an improved
-//    Generalized Feistel network with 2-round AES-128 functions. This Feistel
-//    block shuffle achieves diffusion faster and is less vulnerable to
-//    sliced-biclique attacks than the Type-2 cyclic shuffle.
-//
-// 3) "Improving the Generalized Feistel" and "New criterion for diffusion
-//    property" extends the same kind of improved Feistel block shuffle to 16
-//    branches, which enables a 2048-bit permutation.
-//
-// Combine these three ideas and also change Simpira's subround keys from
-// structured/low-entropy counters to digits of Pi (or other random source).
-
-// RandenTraits contains the basic algorithm traits, such as the size of the
-// state, seed, sponge, etc.
-struct RandenTraits {
-  // Size of the entire sponge / state for the randen PRNG.
-  static constexpr size_t kStateBytes = 256;  // 2048-bit
-
-  // Size of the 'inner' (inaccessible) part of the sponge. Larger values would
-  // require more frequent calls to RandenGenerate.
-  static constexpr size_t kCapacityBytes = 16;  // 128-bit
-
-  // Size of the default seed consumed by the sponge.
-  static constexpr size_t kSeedBytes = kStateBytes - kCapacityBytes;
-
-  // Assuming 128-bit blocks, the number of blocks in the state.
-  // Largest size for which security proofs are known.
-  static constexpr size_t kFeistelBlocks = 16;
-
-  // Ensures SPRP security and two full subblock diffusions.
-  // Must be > 4 * log2(kFeistelBlocks).
-  static constexpr size_t kFeistelRounds = 16 + 1;
-
-  // Size of the key. A 128-bit key block is used for every-other
-  // feistel block (Type-2 generalized Feistel network) in each round.
-  static constexpr size_t kKeyBytes = 16 * kFeistelRounds * kFeistelBlocks / 2;
-};
-
-// Randen key arrays. In randen_round_keys.cc
-extern const unsigned char kRandenRoundKeys[RandenTraits::kKeyBytes];
-extern const unsigned char kRandenRoundKeysBE[RandenTraits::kKeyBytes];
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/salted_seed_seq.h b/third_party/abseil_cpp/absl/random/internal/salted_seed_seq.h
deleted file mode 100644
index 5953a090f80c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/salted_seed_seq.h
+++ /dev/null
@@ -1,167 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_SALTED_SEED_SEQ_H_
-#define ABSL_RANDOM_INTERNAL_SALTED_SEED_SEQ_H_
-
-#include <cstdint>
-#include <cstdlib>
-#include <initializer_list>
-#include <iterator>
-#include <memory>
-#include <type_traits>
-#include <utility>
-
-#include "absl/container/inlined_vector.h"
-#include "absl/meta/type_traits.h"
-#include "absl/random/internal/seed_material.h"
-#include "absl/types/optional.h"
-#include "absl/types/span.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// This class conforms to the C++ Standard "Seed Sequence" concept
-// [rand.req.seedseq].
-//
-// A `SaltedSeedSeq` is meant to wrap an existing seed sequence and modify
-// generated sequence by mixing with extra entropy. This entropy may be
-// build-dependent or process-dependent. The implementation may change to be
-// have either or both kinds of entropy. If salt is not available sequence is
-// not modified.
-template <typename SSeq>
-class SaltedSeedSeq {
- public:
-  using inner_sequence_type = SSeq;
-  using result_type = typename SSeq::result_type;
-
-  SaltedSeedSeq() : seq_(absl::make_unique<SSeq>()) {}
-
-  template <typename Iterator>
-  SaltedSeedSeq(Iterator begin, Iterator end)
-      : seq_(absl::make_unique<SSeq>(begin, end)) {}
-
-  template <typename T>
-  SaltedSeedSeq(std::initializer_list<T> il)
-      : SaltedSeedSeq(il.begin(), il.end()) {}
-
-  SaltedSeedSeq(const SaltedSeedSeq&) = delete;
-  SaltedSeedSeq& operator=(const SaltedSeedSeq&) = delete;
-
-  SaltedSeedSeq(SaltedSeedSeq&&) = default;
-  SaltedSeedSeq& operator=(SaltedSeedSeq&&) = default;
-
-  template <typename RandomAccessIterator>
-  void generate(RandomAccessIterator begin, RandomAccessIterator end) {
-    // The common case is that generate is called with ContiguousIterators
-    // to uint arrays. Such contiguous memory regions may be optimized,
-    // which we detect here.
-    using tag = absl::conditional_t<
-        (std::is_pointer<RandomAccessIterator>::value &&
-         std::is_same<absl::decay_t<decltype(*begin)>, uint32_t>::value),
-        ContiguousAndUint32Tag, DefaultTag>;
-    if (begin != end) {
-      generate_impl(begin, end, tag{});
-    }
-  }
-
-  template <typename OutIterator>
-  void param(OutIterator out) const {
-    seq_->param(out);
-  }
-
-  size_t size() const { return seq_->size(); }
-
- private:
-  struct ContiguousAndUint32Tag {};
-  struct DefaultTag {};
-
-  // Generate which requires the iterators are contiguous pointers to uint32_t.
-  void generate_impl(uint32_t* begin, uint32_t* end, ContiguousAndUint32Tag) {
-    generate_contiguous(absl::MakeSpan(begin, end));
-  }
-
-  // The uncommon case for generate is that it is called with iterators over
-  // some other buffer type which is assignable from a 32-bit value. In this
-  // case we allocate a temporary 32-bit buffer and then copy-assign back
-  // to the initial inputs.
-  template <typename RandomAccessIterator>
-  void generate_impl(RandomAccessIterator begin, RandomAccessIterator end,
-                     DefaultTag) {
-    return generate_and_copy(std::distance(begin, end), begin);
-  }
-
-  // Fills the initial seed buffer the underlying SSeq::generate() call,
-  // mixing in the salt material.
-  void generate_contiguous(absl::Span<uint32_t> buffer) {
-    seq_->generate(buffer.begin(), buffer.end());
-    const uint32_t salt = absl::random_internal::GetSaltMaterial().value_or(0);
-    MixIntoSeedMaterial(absl::MakeConstSpan(&salt, 1), buffer);
-  }
-
-  // Allocates a seed buffer of `n` elements, generates the seed, then
-  // copies the result into the `out` iterator.
-  template <typename Iterator>
-  void generate_and_copy(size_t n, Iterator out) {
-    // Allocate a temporary buffer, generate, and then copy.
-    absl::InlinedVector<uint32_t, 8> data(n, 0);
-    generate_contiguous(absl::MakeSpan(data.data(), data.size()));
-    std::copy(data.begin(), data.end(), out);
-  }
-
-  // Because [rand.req.seedseq] is not required to be copy-constructible,
-  // copy-assignable nor movable, we wrap it with unique pointer to be able
-  // to move SaltedSeedSeq.
-  std::unique_ptr<SSeq> seq_;
-};
-
-// is_salted_seed_seq indicates whether the type is a SaltedSeedSeq.
-template <typename T, typename = void>
-struct is_salted_seed_seq : public std::false_type {};
-
-template <typename T>
-struct is_salted_seed_seq<
-    T, typename std::enable_if<std::is_same<
-           T, SaltedSeedSeq<typename T::inner_sequence_type>>::value>::type>
-    : public std::true_type {};
-
-// MakeSaltedSeedSeq returns a salted variant of the seed sequence.
-// When provided with an existing SaltedSeedSeq, returns the input parameter,
-// otherwise constructs a new SaltedSeedSeq which embodies the original
-// non-salted seed parameters.
-template <
-    typename SSeq,  //
-    typename EnableIf = absl::enable_if_t<is_salted_seed_seq<SSeq>::value>>
-SSeq MakeSaltedSeedSeq(SSeq&& seq) {
-  return SSeq(std::forward<SSeq>(seq));
-}
-
-template <
-    typename SSeq,  //
-    typename EnableIf = absl::enable_if_t<!is_salted_seed_seq<SSeq>::value>>
-SaltedSeedSeq<typename std::decay<SSeq>::type> MakeSaltedSeedSeq(SSeq&& seq) {
-  using sseq_type = typename std::decay<SSeq>::type;
-  using result_type = typename sseq_type::result_type;
-
-  absl::InlinedVector<result_type, 8> data;
-  seq.param(std::back_inserter(data));
-  return SaltedSeedSeq<sseq_type>(data.begin(), data.end());
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_SALTED_SEED_SEQ_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/salted_seed_seq_test.cc b/third_party/abseil_cpp/absl/random/internal/salted_seed_seq_test.cc
deleted file mode 100644
index 0bf19a63ef8c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/salted_seed_seq_test.cc
+++ /dev/null
@@ -1,168 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/salted_seed_seq.h"
-
-#include <iterator>
-#include <random>
-#include <utility>
-#include <vector>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-
-using absl::random_internal::GetSaltMaterial;
-using absl::random_internal::MakeSaltedSeedSeq;
-using absl::random_internal::SaltedSeedSeq;
-using testing::Eq;
-using testing::Pointwise;
-
-namespace {
-
-template <typename Sseq>
-void ConformsToInterface() {
-  // Check that the SeedSequence can be default-constructed.
-  { Sseq default_constructed_seq; }
-  // Check that the SeedSequence can be constructed with two iterators.
-  {
-    uint32_t init_array[] = {1, 3, 5, 7, 9};
-    Sseq iterator_constructed_seq(std::begin(init_array), std::end(init_array));
-  }
-  // Check that the SeedSequence can be std::initializer_list-constructed.
-  { Sseq list_constructed_seq = {1, 3, 5, 7, 9, 11, 13}; }
-  // Check that param() and size() return state provided to constructor.
-  {
-    uint32_t init_array[] = {1, 2, 3, 4, 5};
-    Sseq seq(std::begin(init_array), std::end(init_array));
-    EXPECT_EQ(seq.size(), ABSL_ARRAYSIZE(init_array));
-
-    std::vector<uint32_t> state_vector;
-    seq.param(std::back_inserter(state_vector));
-
-    EXPECT_EQ(state_vector.size(), ABSL_ARRAYSIZE(init_array));
-    for (int i = 0; i < state_vector.size(); i++) {
-      EXPECT_EQ(state_vector[i], i + 1);
-    }
-  }
-  // Check for presence of generate() method.
-  {
-    Sseq seq;
-    uint32_t seeds[5];
-
-    seq.generate(std::begin(seeds), std::end(seeds));
-  }
-}
-
-TEST(SaltedSeedSeq, CheckInterfaces) {
-  // Control case
-  ConformsToInterface<std::seed_seq>();
-
-  // Abseil classes
-  ConformsToInterface<SaltedSeedSeq<std::seed_seq>>();
-}
-
-TEST(SaltedSeedSeq, CheckConstructingFromOtherSequence) {
-  std::vector<uint32_t> seed_values(10, 1);
-  std::seed_seq seq(seed_values.begin(), seed_values.end());
-  auto salted_seq = MakeSaltedSeedSeq(std::move(seq));
-
-  EXPECT_EQ(seq.size(), salted_seq.size());
-
-  std::vector<uint32_t> param_result;
-  seq.param(std::back_inserter(param_result));
-
-  EXPECT_EQ(seed_values, param_result);
-}
-
-TEST(SaltedSeedSeq, SaltedSaltedSeedSeqIsNotDoubleSalted) {
-  uint32_t init[] = {1, 3, 5, 7, 9};
-
-  std::seed_seq seq(std::begin(init), std::end(init));
-
-  // The first salting.
-  SaltedSeedSeq<std::seed_seq> salted_seq = MakeSaltedSeedSeq(std::move(seq));
-  uint32_t a[16];
-  salted_seq.generate(std::begin(a), std::end(a));
-
-  // The second salting.
-  SaltedSeedSeq<std::seed_seq> salted_salted_seq =
-      MakeSaltedSeedSeq(std::move(salted_seq));
-  uint32_t b[16];
-  salted_salted_seq.generate(std::begin(b), std::end(b));
-
-  // ... both should be equal.
-  EXPECT_THAT(b, Pointwise(Eq(), a)) << "a[0] " << a[0];
-}
-
-TEST(SaltedSeedSeq, SeedMaterialIsSalted) {
-  const size_t kNumBlocks = 16;
-
-  uint32_t seed_material[kNumBlocks];
-  std::random_device urandom{"/dev/urandom"};
-  for (uint32_t& seed : seed_material) {
-    seed = urandom();
-  }
-
-  std::seed_seq seq(std::begin(seed_material), std::end(seed_material));
-  SaltedSeedSeq<std::seed_seq> salted_seq(std::begin(seed_material),
-                                          std::end(seed_material));
-
-  bool salt_is_available = GetSaltMaterial().has_value();
-
-  // If salt is available generated sequence should be different.
-  if (salt_is_available) {
-    uint32_t outputs[kNumBlocks];
-    uint32_t salted_outputs[kNumBlocks];
-
-    seq.generate(std::begin(outputs), std::end(outputs));
-    salted_seq.generate(std::begin(salted_outputs), std::end(salted_outputs));
-
-    EXPECT_THAT(outputs, Pointwise(testing::Ne(), salted_outputs));
-  }
-}
-
-TEST(SaltedSeedSeq, GenerateAcceptsDifferentTypes) {
-  const size_t kNumBlocks = 4;
-
-  SaltedSeedSeq<std::seed_seq> seq({1, 2, 3});
-
-  uint32_t expected[kNumBlocks];
-  seq.generate(std::begin(expected), std::end(expected));
-
-  // 32-bit outputs
-  {
-    unsigned long seed_material[kNumBlocks];  // NOLINT(runtime/int)
-    seq.generate(std::begin(seed_material), std::end(seed_material));
-    EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
-  }
-  {
-    unsigned int seed_material[kNumBlocks];  // NOLINT(runtime/int)
-    seq.generate(std::begin(seed_material), std::end(seed_material));
-    EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
-  }
-
-  // 64-bit outputs.
-  {
-    uint64_t seed_material[kNumBlocks];
-    seq.generate(std::begin(seed_material), std::end(seed_material));
-    EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
-  }
-  {
-    int64_t seed_material[kNumBlocks];
-    seq.generate(std::begin(seed_material), std::end(seed_material));
-    EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
-  }
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/seed_material.cc b/third_party/abseil_cpp/absl/random/internal/seed_material.cc
deleted file mode 100644
index 4d38a57419ec..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/seed_material.cc
+++ /dev/null
@@ -1,219 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/seed_material.h"
-
-#include <fcntl.h>
-
-#ifndef _WIN32
-#include <unistd.h>
-#else
-#include <io.h>
-#endif
-
-#include <algorithm>
-#include <cerrno>
-#include <cstdint>
-#include <cstdlib>
-#include <cstring>
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/strings/ascii.h"
-#include "absl/strings/escaping.h"
-#include "absl/strings/string_view.h"
-#include "absl/strings/strip.h"
-
-#if defined(__native_client__)
-
-#include <nacl/nacl_random.h>
-#define ABSL_RANDOM_USE_NACL_SECURE_RANDOM 1
-
-#elif defined(_WIN32)
-
-#include <windows.h>
-#define ABSL_RANDOM_USE_BCRYPT 1
-#pragma comment(lib, "bcrypt.lib")
-
-#elif defined(__Fuchsia__)
-#include <zircon/syscalls.h>
-
-#endif
-
-#if defined(ABSL_RANDOM_USE_BCRYPT)
-#include <bcrypt.h>
-
-#ifndef BCRYPT_SUCCESS
-#define BCRYPT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
-#endif
-// Also link bcrypt; this can be done via linker options or:
-// #pragma comment(lib, "bcrypt.lib")
-#endif
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-namespace {
-
-// Read OS Entropy for random number seeds.
-// TODO(absl-team): Possibly place a cap on how much entropy may be read at a
-// time.
-
-#if defined(ABSL_RANDOM_USE_BCRYPT)
-
-// On Windows potentially use the BCRYPT CNG API to read available entropy.
-bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
-  BCRYPT_ALG_HANDLE hProvider;
-  NTSTATUS ret;
-  ret = BCryptOpenAlgorithmProvider(&hProvider, BCRYPT_RNG_ALGORITHM,
-                                    MS_PRIMITIVE_PROVIDER, 0);
-  if (!(BCRYPT_SUCCESS(ret))) {
-    ABSL_RAW_LOG(ERROR, "Failed to open crypto provider.");
-    return false;
-  }
-  ret = BCryptGenRandom(
-      hProvider,                                             // provider
-      reinterpret_cast<UCHAR*>(values.data()),               // buffer
-      static_cast<ULONG>(sizeof(uint32_t) * values.size()),  // bytes
-      0);                                                    // flags
-  BCryptCloseAlgorithmProvider(hProvider, 0);
-  return BCRYPT_SUCCESS(ret);
-}
-
-#elif defined(ABSL_RANDOM_USE_NACL_SECURE_RANDOM)
-
-// On NaCL use nacl_secure_random to acquire bytes.
-bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
-  auto buffer = reinterpret_cast<uint8_t*>(values.data());
-  size_t buffer_size = sizeof(uint32_t) * values.size();
-
-  uint8_t* output_ptr = buffer;
-  while (buffer_size > 0) {
-    size_t nread = 0;
-    const int error = nacl_secure_random(output_ptr, buffer_size, &nread);
-    if (error != 0 || nread > buffer_size) {
-      ABSL_RAW_LOG(ERROR, "Failed to read secure_random seed data: %d", error);
-      return false;
-    }
-    output_ptr += nread;
-    buffer_size -= nread;
-  }
-  return true;
-}
-
-#elif defined(__Fuchsia__)
-
-bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
-  auto buffer = reinterpret_cast<uint8_t*>(values.data());
-  size_t buffer_size = sizeof(uint32_t) * values.size();
-  zx_cprng_draw(buffer, buffer_size);
-  return true;
-}
-
-#else
-
-// On *nix, read entropy from /dev/urandom.
-bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
-  const char kEntropyFile[] = "/dev/urandom";
-
-  auto buffer = reinterpret_cast<uint8_t*>(values.data());
-  size_t buffer_size = sizeof(uint32_t) * values.size();
-
-  int dev_urandom = open(kEntropyFile, O_RDONLY);
-  bool success = (-1 != dev_urandom);
-  if (!success) {
-    return false;
-  }
-
-  while (success && buffer_size > 0) {
-    int bytes_read = read(dev_urandom, buffer, buffer_size);
-    int read_error = errno;
-    success = (bytes_read > 0);
-    if (success) {
-      buffer += bytes_read;
-      buffer_size -= bytes_read;
-    } else if (bytes_read == -1 && read_error == EINTR) {
-      success = true;  // Need to try again.
-    }
-  }
-  close(dev_urandom);
-  return success;
-}
-
-#endif
-
-}  // namespace
-
-bool ReadSeedMaterialFromOSEntropy(absl::Span<uint32_t> values) {
-  assert(values.data() != nullptr);
-  if (values.data() == nullptr) {
-    return false;
-  }
-  if (values.empty()) {
-    return true;
-  }
-  return ReadSeedMaterialFromOSEntropyImpl(values);
-}
-
-void MixIntoSeedMaterial(absl::Span<const uint32_t> sequence,
-                         absl::Span<uint32_t> seed_material) {
-  // Algorithm is based on code available at
-  // https://gist.github.com/imneme/540829265469e673d045
-  constexpr uint32_t kInitVal = 0x43b0d7e5;
-  constexpr uint32_t kHashMul = 0x931e8875;
-  constexpr uint32_t kMixMulL = 0xca01f9dd;
-  constexpr uint32_t kMixMulR = 0x4973f715;
-  constexpr uint32_t kShiftSize = sizeof(uint32_t) * 8 / 2;
-
-  uint32_t hash_const = kInitVal;
-  auto hash = [&](uint32_t value) {
-    value ^= hash_const;
-    hash_const *= kHashMul;
-    value *= hash_const;
-    value ^= value >> kShiftSize;
-    return value;
-  };
-
-  auto mix = [&](uint32_t x, uint32_t y) {
-    uint32_t result = kMixMulL * x - kMixMulR * y;
-    result ^= result >> kShiftSize;
-    return result;
-  };
-
-  for (const auto& seq_val : sequence) {
-    for (auto& elem : seed_material) {
-      elem = mix(elem, hash(seq_val));
-    }
-  }
-}
-
-absl::optional<uint32_t> GetSaltMaterial() {
-  // Salt must be common for all generators within the same process so read it
-  // only once and store in static variable.
-  static const auto salt_material = []() -> absl::optional<uint32_t> {
-    uint32_t salt_value = 0;
-
-    if (random_internal::ReadSeedMaterialFromOSEntropy(
-            MakeSpan(&salt_value, 1))) {
-      return salt_value;
-    }
-
-    return absl::nullopt;
-  }();
-
-  return salt_material;
-}
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/random/internal/seed_material.h b/third_party/abseil_cpp/absl/random/internal/seed_material.h
deleted file mode 100644
index 4be10e925685..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/seed_material.h
+++ /dev/null
@@ -1,104 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_SEED_MATERIAL_H_
-#define ABSL_RANDOM_INTERNAL_SEED_MATERIAL_H_
-
-#include <cassert>
-#include <cstdint>
-#include <cstdlib>
-#include <string>
-#include <vector>
-
-#include "absl/base/attributes.h"
-#include "absl/random/internal/fast_uniform_bits.h"
-#include "absl/types/optional.h"
-#include "absl/types/span.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// Returns the number of 32-bit blocks needed to contain the given number of
-// bits.
-constexpr size_t SeedBitsToBlocks(size_t seed_size) {
-  return (seed_size + 31) / 32;
-}
-
-// Amount of entropy (measured in bits) used to instantiate a Seed Sequence,
-// with which to create a URBG.
-constexpr size_t kEntropyBitsNeeded = 256;
-
-// Amount of entropy (measured in 32-bit blocks) used to instantiate a Seed
-// Sequence, with which to create a URBG.
-constexpr size_t kEntropyBlocksNeeded =
-    random_internal::SeedBitsToBlocks(kEntropyBitsNeeded);
-
-static_assert(kEntropyBlocksNeeded > 0,
-              "Entropy used to seed URBGs must be nonzero.");
-
-// Attempts to fill a span of uint32_t-values using an OS-provided source of
-// true entropy (eg. /dev/urandom) into an array of uint32_t blocks of data. The
-// resulting array may be used to initialize an instance of a class conforming
-// to the C++ Standard "Seed Sequence" concept [rand.req.seedseq].
-//
-// If values.data() == nullptr, the behavior is undefined.
-ABSL_MUST_USE_RESULT
-bool ReadSeedMaterialFromOSEntropy(absl::Span<uint32_t> values);
-
-// Attempts to fill a span of uint32_t-values using variates generated by an
-// existing instance of a class conforming to the C++ Standard "Uniform Random
-// Bit Generator" concept [rand.req.urng]. The resulting data may be used to
-// initialize an instance of a class conforming to the C++ Standard
-// "Seed Sequence" concept [rand.req.seedseq].
-//
-// If urbg == nullptr or values.data() == nullptr, the behavior is undefined.
-template <typename URBG>
-ABSL_MUST_USE_RESULT bool ReadSeedMaterialFromURBG(
-    URBG* urbg, absl::Span<uint32_t> values) {
-  random_internal::FastUniformBits<uint32_t> distr;
-
-  assert(urbg != nullptr && values.data() != nullptr);
-  if (urbg == nullptr || values.data() == nullptr) {
-    return false;
-  }
-
-  for (uint32_t& seed_value : values) {
-    seed_value = distr(*urbg);
-  }
-  return true;
-}
-
-// Mixes given sequence of values with into given sequence of seed material.
-// Time complexity of this function is O(sequence.size() *
-// seed_material.size()).
-//
-// Algorithm is based on code available at
-// https://gist.github.com/imneme/540829265469e673d045
-// by Melissa O'Neill.
-void MixIntoSeedMaterial(absl::Span<const uint32_t> sequence,
-                         absl::Span<uint32_t> seed_material);
-
-// Returns salt value.
-//
-// Salt is obtained only once and stored in static variable.
-//
-// May return empty value if optaining the salt was not possible.
-absl::optional<uint32_t> GetSaltMaterial();
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_SEED_MATERIAL_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/seed_material_test.cc b/third_party/abseil_cpp/absl/random/internal/seed_material_test.cc
deleted file mode 100644
index 6db2820ec707..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/seed_material_test.cc
+++ /dev/null
@@ -1,202 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/seed_material.h"
-
-#include <bitset>
-#include <cstdlib>
-#include <cstring>
-#include <random>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-
-#ifdef __ANDROID__
-// Android assert messages only go to system log, so death tests cannot inspect
-// the message for matching.
-#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
-  EXPECT_DEATH_IF_SUPPORTED(statement, ".*")
-#else
-#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
-  EXPECT_DEATH_IF_SUPPORTED(statement, regex)
-#endif
-
-namespace {
-
-using testing::Each;
-using testing::ElementsAre;
-using testing::Eq;
-using testing::Ne;
-using testing::Pointwise;
-
-TEST(SeedBitsToBlocks, VerifyCases) {
-  EXPECT_EQ(0, absl::random_internal::SeedBitsToBlocks(0));
-  EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(1));
-  EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(31));
-  EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(32));
-  EXPECT_EQ(2, absl::random_internal::SeedBitsToBlocks(33));
-  EXPECT_EQ(4, absl::random_internal::SeedBitsToBlocks(127));
-  EXPECT_EQ(4, absl::random_internal::SeedBitsToBlocks(128));
-  EXPECT_EQ(5, absl::random_internal::SeedBitsToBlocks(129));
-}
-
-TEST(ReadSeedMaterialFromOSEntropy, SuccessiveReadsAreDistinct) {
-  constexpr size_t kSeedMaterialSize = 64;
-  uint32_t seed_material_1[kSeedMaterialSize] = {};
-  uint32_t seed_material_2[kSeedMaterialSize] = {};
-
-  EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
-      absl::Span<uint32_t>(seed_material_1, kSeedMaterialSize)));
-  EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
-      absl::Span<uint32_t>(seed_material_2, kSeedMaterialSize)));
-
-  EXPECT_THAT(seed_material_1, Pointwise(Ne(), seed_material_2));
-}
-
-TEST(ReadSeedMaterialFromOSEntropy, ReadZeroBytesIsNoOp) {
-  uint32_t seed_material[32] = {};
-  std::memset(seed_material, 0xAA, sizeof(seed_material));
-  EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
-      absl::Span<uint32_t>(seed_material, 0)));
-
-  EXPECT_THAT(seed_material, Each(Eq(0xAAAAAAAA)));
-}
-
-TEST(ReadSeedMaterialFromOSEntropy, NullPtrVectorArgument) {
-#ifdef NDEBUG
-  EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
-      absl::Span<uint32_t>(nullptr, 32)));
-#else
-  bool result;
-  ABSL_EXPECT_DEATH_IF_SUPPORTED(
-      result = absl::random_internal::ReadSeedMaterialFromOSEntropy(
-          absl::Span<uint32_t>(nullptr, 32)),
-      "!= nullptr");
-  (void)result;  // suppress unused-variable warning
-#endif
-}
-
-TEST(ReadSeedMaterialFromURBG, SeedMaterialEqualsVariateSequence) {
-  // Two default-constructed instances of std::mt19937_64 are guaranteed to
-  // produce equal variate-sequences.
-  std::mt19937 urbg_1;
-  std::mt19937 urbg_2;
-  constexpr size_t kSeedMaterialSize = 1024;
-  uint32_t seed_material[kSeedMaterialSize] = {};
-
-  EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromURBG(
-      &urbg_1, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)));
-  for (uint32_t seed : seed_material) {
-    EXPECT_EQ(seed, urbg_2());
-  }
-}
-
-TEST(ReadSeedMaterialFromURBG, ReadZeroBytesIsNoOp) {
-  std::mt19937_64 urbg;
-  uint32_t seed_material[32];
-  std::memset(seed_material, 0xAA, sizeof(seed_material));
-  EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromURBG(
-      &urbg, absl::Span<uint32_t>(seed_material, 0)));
-
-  EXPECT_THAT(seed_material, Each(Eq(0xAAAAAAAA)));
-}
-
-TEST(ReadSeedMaterialFromURBG, NullUrbgArgument) {
-  constexpr size_t kSeedMaterialSize = 32;
-  uint32_t seed_material[kSeedMaterialSize];
-#ifdef NDEBUG
-  EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromURBG<std::mt19937_64>(
-      nullptr, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)));
-#else
-  bool result;
-  ABSL_EXPECT_DEATH_IF_SUPPORTED(
-      result = absl::random_internal::ReadSeedMaterialFromURBG<std::mt19937_64>(
-          nullptr, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)),
-      "!= nullptr");
-  (void)result;  // suppress unused-variable warning
-#endif
-}
-
-TEST(ReadSeedMaterialFromURBG, NullPtrVectorArgument) {
-  std::mt19937_64 urbg;
-#ifdef NDEBUG
-  EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromURBG(
-      &urbg, absl::Span<uint32_t>(nullptr, 32)));
-#else
-  bool result;
-  ABSL_EXPECT_DEATH_IF_SUPPORTED(
-      result = absl::random_internal::ReadSeedMaterialFromURBG(
-          &urbg, absl::Span<uint32_t>(nullptr, 32)),
-      "!= nullptr");
-  (void)result;  // suppress unused-variable warning
-#endif
-}
-
-// The avalanche effect is a desirable cryptographic property of hashes in which
-// changing a single bit in the input causes each bit of the output to be
-// changed with probability near 50%.
-//
-// https://en.wikipedia.org/wiki/Avalanche_effect
-
-TEST(MixSequenceIntoSeedMaterial, AvalancheEffectTestOneBitLong) {
-  std::vector<uint32_t> seed_material = {1, 2, 3, 4, 5, 6, 7, 8};
-
-  // For every 32-bit number with exactly one bit set, verify the avalanche
-  // effect holds.  In order to reduce flakiness of tests, accept values
-  // anywhere in the range of 30%-70%.
-  for (uint32_t v = 1; v != 0; v <<= 1) {
-    std::vector<uint32_t> seed_material_copy = seed_material;
-    absl::random_internal::MixIntoSeedMaterial(
-        absl::Span<uint32_t>(&v, 1),
-        absl::Span<uint32_t>(seed_material_copy.data(),
-                             seed_material_copy.size()));
-
-    uint32_t changed_bits = 0;
-    for (size_t i = 0; i < seed_material.size(); i++) {
-      std::bitset<sizeof(uint32_t) * 8> bitset(seed_material[i] ^
-                                               seed_material_copy[i]);
-      changed_bits += bitset.count();
-    }
-
-    EXPECT_LE(changed_bits, 0.7 * sizeof(uint32_t) * 8 * seed_material.size());
-    EXPECT_GE(changed_bits, 0.3 * sizeof(uint32_t) * 8 * seed_material.size());
-  }
-}
-
-TEST(MixSequenceIntoSeedMaterial, AvalancheEffectTestOneBitShort) {
-  std::vector<uint32_t> seed_material = {1};
-
-  // For every 32-bit number with exactly one bit set, verify the avalanche
-  // effect holds.  In order to reduce flakiness of tests, accept values
-  // anywhere in the range of 30%-70%.
-  for (uint32_t v = 1; v != 0; v <<= 1) {
-    std::vector<uint32_t> seed_material_copy = seed_material;
-    absl::random_internal::MixIntoSeedMaterial(
-        absl::Span<uint32_t>(&v, 1),
-        absl::Span<uint32_t>(seed_material_copy.data(),
-                             seed_material_copy.size()));
-
-    uint32_t changed_bits = 0;
-    for (size_t i = 0; i < seed_material.size(); i++) {
-      std::bitset<sizeof(uint32_t) * 8> bitset(seed_material[i] ^
-                                               seed_material_copy[i]);
-      changed_bits += bitset.count();
-    }
-
-    EXPECT_LE(changed_bits, 0.7 * sizeof(uint32_t) * 8 * seed_material.size());
-    EXPECT_GE(changed_bits, 0.3 * sizeof(uint32_t) * 8 * seed_material.size());
-  }
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/sequence_urbg.h b/third_party/abseil_cpp/absl/random/internal/sequence_urbg.h
deleted file mode 100644
index bc96a12cd29c..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/sequence_urbg.h
+++ /dev/null
@@ -1,60 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
-#define ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
-
-#include <cstdint>
-#include <cstring>
-#include <limits>
-#include <type_traits>
-#include <vector>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// `sequence_urbg` is a simple random number generator which meets the
-// requirements of [rand.req.urbg], and is solely for testing absl
-// distributions.
-class sequence_urbg {
- public:
-  using result_type = uint64_t;
-
-  static constexpr result_type(min)() {
-    return (std::numeric_limits<result_type>::min)();
-  }
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  sequence_urbg(std::initializer_list<result_type> data) : i_(0), data_(data) {}
-  void reset() { i_ = 0; }
-
-  result_type operator()() { return data_[i_++ % data_.size()]; }
-
-  size_t invocations() const { return i_; }
-
- private:
-  size_t i_;
-  std::vector<result_type> data_;
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/traits.h b/third_party/abseil_cpp/absl/random/internal/traits.h
deleted file mode 100644
index 75772bd9abb4..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/traits.h
+++ /dev/null
@@ -1,101 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_TRAITS_H_
-#define ABSL_RANDOM_INTERNAL_TRAITS_H_
-
-#include <cstdint>
-#include <limits>
-#include <type_traits>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// random_internal::is_widening_convertible<A, B>
-//
-// Returns whether a type A is widening-convertible to a type B.
-//
-// A is widening-convertible to B means:
-//   A a = <any number>;
-//   B b = a;
-//   A c = b;
-//   EXPECT_EQ(a, c);
-template <typename A, typename B>
-class is_widening_convertible {
-  // As long as there are enough bits in the exact part of a number:
-  // - unsigned can fit in float, signed, unsigned
-  // - signed can fit in float, signed
-  // - float can fit in float
-  // So we define rank to be:
-  // - rank(float) -> 2
-  // - rank(signed) -> 1
-  // - rank(unsigned) -> 0
-  template <class T>
-  static constexpr int rank() {
-    return !std::numeric_limits<T>::is_integer +
-           std::numeric_limits<T>::is_signed;
-  }
-
- public:
-  // If an arithmetic-type B can represent at least as many digits as a type A,
-  // and B belongs to a rank no lower than A, then A can be safely represented
-  // by B through a widening-conversion.
-  static constexpr bool value =
-      std::numeric_limits<A>::digits <= std::numeric_limits<B>::digits &&
-      rank<A>() <= rank<B>();
-};
-
-// unsigned_bits<N>::type returns the unsigned int type with the indicated
-// number of bits.
-template <size_t N>
-struct unsigned_bits;
-
-template <>
-struct unsigned_bits<8> {
-  using type = uint8_t;
-};
-template <>
-struct unsigned_bits<16> {
-  using type = uint16_t;
-};
-template <>
-struct unsigned_bits<32> {
-  using type = uint32_t;
-};
-template <>
-struct unsigned_bits<64> {
-  using type = uint64_t;
-};
-
-#ifdef ABSL_HAVE_INTRINSIC_INT128
-template <>
-struct unsigned_bits<128> {
-  using type = __uint128_t;
-};
-#endif
-
-template <typename IntType>
-struct make_unsigned_bits {
-  using type = typename unsigned_bits<std::numeric_limits<
-      typename std::make_unsigned<IntType>::type>::digits>::type;
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_TRAITS_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/traits_test.cc b/third_party/abseil_cpp/absl/random/internal/traits_test.cc
deleted file mode 100644
index a844887d3e44..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/traits_test.cc
+++ /dev/null
@@ -1,126 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/traits.h"
-
-#include <cstdint>
-#include <type_traits>
-
-#include "gtest/gtest.h"
-
-namespace {
-
-using absl::random_internal::is_widening_convertible;
-
-// CheckWideningConvertsToSelf<T1, T2, ...>()
-//
-// For each type T, checks:
-// - T IS widening-convertible to itself.
-//
-template <typename T>
-void CheckWideningConvertsToSelf() {
-  static_assert(is_widening_convertible<T, T>::value,
-                "Type is not convertible to self!");
-}
-
-template <typename T, typename Next, typename... Args>
-void CheckWideningConvertsToSelf() {
-  CheckWideningConvertsToSelf<T>();
-  CheckWideningConvertsToSelf<Next, Args...>();
-}
-
-// CheckNotWideningConvertibleWithSigned<T1, T2, ...>()
-//
-// For each unsigned-type T, checks that:
-// - T is NOT widening-convertible to Signed(T)
-// - Signed(T) is NOT widening-convertible to T
-//
-template <typename T>
-void CheckNotWideningConvertibleWithSigned() {
-  using signed_t = typename std::make_signed<T>::type;
-
-  static_assert(!is_widening_convertible<T, signed_t>::value,
-                "Unsigned type is convertible to same-sized signed-type!");
-  static_assert(!is_widening_convertible<signed_t, T>::value,
-                "Signed type is convertible to same-sized unsigned-type!");
-}
-
-template <typename T, typename Next, typename... Args>
-void CheckNotWideningConvertibleWithSigned() {
-  CheckNotWideningConvertibleWithSigned<T>();
-  CheckWideningConvertsToSelf<Next, Args...>();
-}
-
-// CheckWideningConvertsToLargerType<T1, T2, ...>()
-//
-// For each successive unsigned-types {Ti, Ti+1}, checks that:
-// - Ti IS widening-convertible to Ti+1
-// - Ti IS widening-convertible to Signed(Ti+1)
-// - Signed(Ti) is NOT widening-convertible to Ti
-// - Signed(Ti) IS widening-convertible to Ti+1
-template <typename T, typename Higher>
-void CheckWideningConvertsToLargerTypes() {
-  using signed_t = typename std::make_signed<T>::type;
-  using higher_t = Higher;
-  using signed_higher_t = typename std::make_signed<Higher>::type;
-
-  static_assert(is_widening_convertible<T, higher_t>::value,
-                "Type not embeddable into larger type!");
-  static_assert(is_widening_convertible<T, signed_higher_t>::value,
-                "Type not embeddable into larger signed type!");
-  static_assert(!is_widening_convertible<signed_t, higher_t>::value,
-                "Signed type is embeddable into larger unsigned type!");
-  static_assert(is_widening_convertible<signed_t, signed_higher_t>::value,
-                "Signed type not embeddable into larger signed type!");
-}
-
-template <typename T, typename Higher, typename Next, typename... Args>
-void CheckWideningConvertsToLargerTypes() {
-  CheckWideningConvertsToLargerTypes<T, Higher>();
-  CheckWideningConvertsToLargerTypes<Higher, Next, Args...>();
-}
-
-// CheckWideningConvertsTo<T, U, [expect]>
-//
-// Checks that T DOES widening-convert to U.
-// If "expect" is false, then asserts that T does NOT widening-convert to U.
-template <typename T, typename U, bool expect = true>
-void CheckWideningConvertsTo() {
-  static_assert(is_widening_convertible<T, U>::value == expect,
-                "Unexpected result for is_widening_convertible<T, U>!");
-}
-
-TEST(TraitsTest, IsWideningConvertibleTest) {
-  constexpr bool kInvalid = false;
-
-  CheckWideningConvertsToSelf<
-      uint8_t, uint16_t, uint32_t, uint64_t,
-      int8_t,  int16_t,  int32_t,  int64_t,
-      float,   double>();
-  CheckNotWideningConvertibleWithSigned<
-      uint8_t, uint16_t, uint32_t, uint64_t>();
-  CheckWideningConvertsToLargerTypes<
-      uint8_t, uint16_t, uint32_t, uint64_t>();
-
-  CheckWideningConvertsTo<float, double>();
-  CheckWideningConvertsTo<uint16_t, float>();
-  CheckWideningConvertsTo<uint32_t, double>();
-  CheckWideningConvertsTo<uint64_t, double, kInvalid>();
-  CheckWideningConvertsTo<double, float, kInvalid>();
-
-  CheckWideningConvertsTo<bool, int>();
-  CheckWideningConvertsTo<bool, float>();
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/uniform_helper.h b/third_party/abseil_cpp/absl/random/internal/uniform_helper.h
deleted file mode 100644
index 1243bc1c62ab..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/uniform_helper.h
+++ /dev/null
@@ -1,244 +0,0 @@
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-#ifndef ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
-#define ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
-
-#include <cmath>
-#include <limits>
-#include <type_traits>
-
-#include "absl/base/config.h"
-#include "absl/meta/type_traits.h"
-#include "absl/random/internal/traits.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-template <typename IntType>
-class uniform_int_distribution;
-
-template <typename RealType>
-class uniform_real_distribution;
-
-// Interval tag types which specify whether the interval is open or closed
-// on either boundary.
-
-namespace random_internal {
-template <typename T>
-struct TagTypeCompare {};
-
-template <typename T>
-constexpr bool operator==(TagTypeCompare<T>, TagTypeCompare<T>) {
-  // Tags are mono-states. They always compare equal.
-  return true;
-}
-template <typename T>
-constexpr bool operator!=(TagTypeCompare<T>, TagTypeCompare<T>) {
-  return false;
-}
-
-}  // namespace random_internal
-
-struct IntervalClosedClosedTag
-    : public random_internal::TagTypeCompare<IntervalClosedClosedTag> {};
-struct IntervalClosedOpenTag
-    : public random_internal::TagTypeCompare<IntervalClosedOpenTag> {};
-struct IntervalOpenClosedTag
-    : public random_internal::TagTypeCompare<IntervalOpenClosedTag> {};
-struct IntervalOpenOpenTag
-    : public random_internal::TagTypeCompare<IntervalOpenOpenTag> {};
-
-namespace random_internal {
-
-// In the absence of an explicitly provided return-type, the template
-// "uniform_inferred_return_t<A, B>" is used to derive a suitable type, based on
-// the data-types of the endpoint-arguments {A lo, B hi}.
-//
-// Given endpoints {A lo, B hi}, one of {A, B} will be chosen as the
-// return-type, if one type can be implicitly converted into the other, in a
-// lossless way. The template "is_widening_convertible" implements the
-// compile-time logic for deciding if such a conversion is possible.
-//
-// If no such conversion between {A, B} exists, then the overload for
-// absl::Uniform() will be discarded, and the call will be ill-formed.
-// Return-type for absl::Uniform() when the return-type is inferred.
-template <typename A, typename B>
-using uniform_inferred_return_t =
-    absl::enable_if_t<absl::disjunction<is_widening_convertible<A, B>,
-                                        is_widening_convertible<B, A>>::value,
-                      typename std::conditional<
-                          is_widening_convertible<A, B>::value, B, A>::type>;
-
-// The functions
-//    uniform_lower_bound(tag, a, b)
-// and
-//    uniform_upper_bound(tag, a, b)
-// are used as implementation-details for absl::Uniform().
-//
-// Conceptually,
-//    [a, b] == [uniform_lower_bound(IntervalClosedClosed, a, b),
-//               uniform_upper_bound(IntervalClosedClosed, a, b)]
-//    (a, b) == [uniform_lower_bound(IntervalOpenOpen, a, b),
-//               uniform_upper_bound(IntervalOpenOpen, a, b)]
-//    [a, b) == [uniform_lower_bound(IntervalClosedOpen, a, b),
-//               uniform_upper_bound(IntervalClosedOpen, a, b)]
-//    (a, b] == [uniform_lower_bound(IntervalOpenClosed, a, b),
-//               uniform_upper_bound(IntervalOpenClosed, a, b)]
-//
-template <typename IntType, typename Tag>
-typename absl::enable_if_t<
-    absl::conjunction<
-        std::is_integral<IntType>,
-        absl::disjunction<std::is_same<Tag, IntervalOpenClosedTag>,
-                          std::is_same<Tag, IntervalOpenOpenTag>>>::value,
-    IntType>
-uniform_lower_bound(Tag, IntType a, IntType) {
-  return a < (std::numeric_limits<IntType>::max)() ? (a + 1) : a;
-}
-
-template <typename FloatType, typename Tag>
-typename absl::enable_if_t<
-    absl::conjunction<
-        std::is_floating_point<FloatType>,
-        absl::disjunction<std::is_same<Tag, IntervalOpenClosedTag>,
-                          std::is_same<Tag, IntervalOpenOpenTag>>>::value,
-    FloatType>
-uniform_lower_bound(Tag, FloatType a, FloatType b) {
-  return std::nextafter(a, b);
-}
-
-template <typename NumType, typename Tag>
-typename absl::enable_if_t<
-    absl::disjunction<std::is_same<Tag, IntervalClosedClosedTag>,
-                      std::is_same<Tag, IntervalClosedOpenTag>>::value,
-    NumType>
-uniform_lower_bound(Tag, NumType a, NumType) {
-  return a;
-}
-
-template <typename IntType, typename Tag>
-typename absl::enable_if_t<
-    absl::conjunction<
-        std::is_integral<IntType>,
-        absl::disjunction<std::is_same<Tag, IntervalClosedOpenTag>,
-                          std::is_same<Tag, IntervalOpenOpenTag>>>::value,
-    IntType>
-uniform_upper_bound(Tag, IntType, IntType b) {
-  return b > (std::numeric_limits<IntType>::min)() ? (b - 1) : b;
-}
-
-template <typename FloatType, typename Tag>
-typename absl::enable_if_t<
-    absl::conjunction<
-        std::is_floating_point<FloatType>,
-        absl::disjunction<std::is_same<Tag, IntervalClosedOpenTag>,
-                          std::is_same<Tag, IntervalOpenOpenTag>>>::value,
-    FloatType>
-uniform_upper_bound(Tag, FloatType, FloatType b) {
-  return b;
-}
-
-template <typename IntType, typename Tag>
-typename absl::enable_if_t<
-    absl::conjunction<
-        std::is_integral<IntType>,
-        absl::disjunction<std::is_same<Tag, IntervalClosedClosedTag>,
-                          std::is_same<Tag, IntervalOpenClosedTag>>>::value,
-    IntType>
-uniform_upper_bound(Tag, IntType, IntType b) {
-  return b;
-}
-
-template <typename FloatType, typename Tag>
-typename absl::enable_if_t<
-    absl::conjunction<
-        std::is_floating_point<FloatType>,
-        absl::disjunction<std::is_same<Tag, IntervalClosedClosedTag>,
-                          std::is_same<Tag, IntervalOpenClosedTag>>>::value,
-    FloatType>
-uniform_upper_bound(Tag, FloatType, FloatType b) {
-  return std::nextafter(b, (std::numeric_limits<FloatType>::max)());
-}
-
-// Returns whether the bounds are valid for the underlying distribution.
-// Inputs must have already been resolved via uniform_*_bound calls.
-//
-// The c++ standard constraints in [rand.dist.uni.int] are listed as:
-//    requires: lo <= hi.
-//
-// In the uniform_int_distrubtion, {lo, hi} are closed, closed. Thus:
-// [0, 0] is legal.
-// [0, 0) is not legal, but [0, 1) is, which translates to [0, 0].
-// (0, 1) is not legal, but (0, 2) is, which translates to [1, 1].
-// (0, 0] is not legal, but (0, 1] is, which translates to [1, 1].
-//
-// The c++ standard constraints in [rand.dist.uni.real] are listed as:
-//    requires: lo <= hi.
-//    requires: (hi - lo) <= numeric_limits<T>::max()
-//
-// In the uniform_real_distribution, {lo, hi} are closed, open, Thus:
-// [0, 0] is legal, which is [0, 0+epsilon).
-// [0, 0) is legal.
-// (0, 0) is not legal, but (0-epsilon, 0+epsilon) is.
-// (0, 0] is not legal, but (0, 0+epsilon] is.
-//
-template <typename FloatType>
-absl::enable_if_t<std::is_floating_point<FloatType>::value, bool>
-is_uniform_range_valid(FloatType a, FloatType b) {
-  return a <= b && std::isfinite(b - a);
-}
-
-template <typename IntType>
-absl::enable_if_t<std::is_integral<IntType>::value, bool>
-is_uniform_range_valid(IntType a, IntType b) {
-  return a <= b;
-}
-
-// UniformDistribution selects either absl::uniform_int_distribution
-// or absl::uniform_real_distribution depending on the NumType parameter.
-template <typename NumType>
-using UniformDistribution =
-    typename std::conditional<std::is_integral<NumType>::value,
-                              absl::uniform_int_distribution<NumType>,
-                              absl::uniform_real_distribution<NumType>>::type;
-
-// UniformDistributionWrapper is used as the underlying distribution type
-// by the absl::Uniform template function. It selects the proper Abseil
-// uniform distribution and provides constructor overloads that match the
-// expected parameter order as well as adjusting distribtuion bounds based
-// on the tag.
-template <typename NumType>
-struct UniformDistributionWrapper : public UniformDistribution<NumType> {
-  template <typename TagType>
-  explicit UniformDistributionWrapper(TagType, NumType lo, NumType hi)
-      : UniformDistribution<NumType>(
-            uniform_lower_bound<NumType>(TagType{}, lo, hi),
-            uniform_upper_bound<NumType>(TagType{}, lo, hi)) {}
-
-  explicit UniformDistributionWrapper(NumType lo, NumType hi)
-      : UniformDistribution<NumType>(
-            uniform_lower_bound<NumType>(IntervalClosedOpenTag(), lo, hi),
-            uniform_upper_bound<NumType>(IntervalClosedOpenTag(), lo, hi)) {}
-
-  explicit UniformDistributionWrapper()
-      : UniformDistribution<NumType>(std::numeric_limits<NumType>::lowest(),
-                                     (std::numeric_limits<NumType>::max)()) {}
-};
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/uniform_helper_test.cc b/third_party/abseil_cpp/absl/random/internal/uniform_helper_test.cc
deleted file mode 100644
index 173c49b0b7f8..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/uniform_helper_test.cc
+++ /dev/null
@@ -1,279 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/uniform_helper.h"
-
-#include <cmath>
-#include <cstdint>
-#include <random>
-
-#include "gtest/gtest.h"
-
-namespace {
-
-using absl::IntervalClosedClosedTag;
-using absl::IntervalClosedOpenTag;
-using absl::IntervalOpenClosedTag;
-using absl::IntervalOpenOpenTag;
-using absl::random_internal::uniform_inferred_return_t;
-using absl::random_internal::uniform_lower_bound;
-using absl::random_internal::uniform_upper_bound;
-
-class UniformHelperTest : public testing::Test {};
-
-TEST_F(UniformHelperTest, UniformBoundFunctionsGeneral) {
-  constexpr IntervalClosedClosedTag IntervalClosedClosed;
-  constexpr IntervalClosedOpenTag IntervalClosedOpen;
-  constexpr IntervalOpenClosedTag IntervalOpenClosed;
-  constexpr IntervalOpenOpenTag IntervalOpenOpen;
-
-  // absl::uniform_int_distribution natively assumes IntervalClosedClosed
-  // absl::uniform_real_distribution natively assumes IntervalClosedOpen
-
-  EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, 0, 100), 1);
-  EXPECT_EQ(uniform_lower_bound(IntervalOpenOpen, 0, 100), 1);
-  EXPECT_GT(uniform_lower_bound<float>(IntervalOpenClosed, 0, 1.0), 0);
-  EXPECT_GT(uniform_lower_bound<float>(IntervalOpenOpen, 0, 1.0), 0);
-  EXPECT_GT(uniform_lower_bound<double>(IntervalOpenClosed, 0, 1.0), 0);
-  EXPECT_GT(uniform_lower_bound<double>(IntervalOpenOpen, 0, 1.0), 0);
-
-  EXPECT_EQ(uniform_lower_bound(IntervalClosedClosed, 0, 100), 0);
-  EXPECT_EQ(uniform_lower_bound(IntervalClosedOpen, 0, 100), 0);
-  EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedClosed, 0, 1.0), 0);
-  EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedOpen, 0, 1.0), 0);
-  EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedClosed, 0, 1.0), 0);
-  EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedOpen, 0, 1.0), 0);
-
-  EXPECT_EQ(uniform_upper_bound(IntervalOpenOpen, 0, 100), 99);
-  EXPECT_EQ(uniform_upper_bound(IntervalClosedOpen, 0, 100), 99);
-  EXPECT_EQ(uniform_upper_bound<float>(IntervalOpenOpen, 0, 1.0), 1.0);
-  EXPECT_EQ(uniform_upper_bound<float>(IntervalClosedOpen, 0, 1.0), 1.0);
-  EXPECT_EQ(uniform_upper_bound<double>(IntervalOpenOpen, 0, 1.0), 1.0);
-  EXPECT_EQ(uniform_upper_bound<double>(IntervalClosedOpen, 0, 1.0), 1.0);
-
-  EXPECT_EQ(uniform_upper_bound(IntervalOpenClosed, 0, 100), 100);
-  EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, 0, 100), 100);
-  EXPECT_GT(uniform_upper_bound<float>(IntervalOpenClosed, 0, 1.0), 1.0);
-  EXPECT_GT(uniform_upper_bound<float>(IntervalClosedClosed, 0, 1.0), 1.0);
-  EXPECT_GT(uniform_upper_bound<double>(IntervalOpenClosed, 0, 1.0), 1.0);
-  EXPECT_GT(uniform_upper_bound<double>(IntervalClosedClosed, 0, 1.0), 1.0);
-
-  // Negative value tests
-  EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, -100, -1), -99);
-  EXPECT_EQ(uniform_lower_bound(IntervalOpenOpen, -100, -1), -99);
-  EXPECT_GT(uniform_lower_bound<float>(IntervalOpenClosed, -2.0, -1.0), -2.0);
-  EXPECT_GT(uniform_lower_bound<float>(IntervalOpenOpen, -2.0, -1.0), -2.0);
-  EXPECT_GT(uniform_lower_bound<double>(IntervalOpenClosed, -2.0, -1.0), -2.0);
-  EXPECT_GT(uniform_lower_bound<double>(IntervalOpenOpen, -2.0, -1.0), -2.0);
-
-  EXPECT_EQ(uniform_lower_bound(IntervalClosedClosed, -100, -1), -100);
-  EXPECT_EQ(uniform_lower_bound(IntervalClosedOpen, -100, -1), -100);
-  EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedClosed, -2.0, -1.0), -2.0);
-  EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedOpen, -2.0, -1.0), -2.0);
-  EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedClosed, -2.0, -1.0),
-            -2.0);
-  EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedOpen, -2.0, -1.0), -2.0);
-
-  EXPECT_EQ(uniform_upper_bound(IntervalOpenOpen, -100, -1), -2);
-  EXPECT_EQ(uniform_upper_bound(IntervalClosedOpen, -100, -1), -2);
-  EXPECT_EQ(uniform_upper_bound<float>(IntervalOpenOpen, -2.0, -1.0), -1.0);
-  EXPECT_EQ(uniform_upper_bound<float>(IntervalClosedOpen, -2.0, -1.0), -1.0);
-  EXPECT_EQ(uniform_upper_bound<double>(IntervalOpenOpen, -2.0, -1.0), -1.0);
-  EXPECT_EQ(uniform_upper_bound<double>(IntervalClosedOpen, -2.0, -1.0), -1.0);
-
-  EXPECT_EQ(uniform_upper_bound(IntervalOpenClosed, -100, -1), -1);
-  EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, -100, -1), -1);
-  EXPECT_GT(uniform_upper_bound<float>(IntervalOpenClosed, -2.0, -1.0), -1.0);
-  EXPECT_GT(uniform_upper_bound<float>(IntervalClosedClosed, -2.0, -1.0), -1.0);
-  EXPECT_GT(uniform_upper_bound<double>(IntervalOpenClosed, -2.0, -1.0), -1.0);
-  EXPECT_GT(uniform_upper_bound<double>(IntervalClosedClosed, -2.0, -1.0),
-            -1.0);
-
-  EXPECT_GT(uniform_lower_bound(IntervalOpenClosed, 1.0, 2.0), 1.0);
-  EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, +0.0), 1.0);
-  EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, -0.0), 1.0);
-  EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, -1.0), 1.0);
-}
-
-TEST_F(UniformHelperTest, UniformBoundFunctionsIntBounds) {
-  // Verifies the saturating nature of uniform_lower_bound and
-  // uniform_upper_bound
-  constexpr IntervalOpenOpenTag IntervalOpenOpen;
-
-  // uint max.
-  constexpr auto m = (std::numeric_limits<uint64_t>::max)();
-
-  EXPECT_EQ(1, uniform_lower_bound(IntervalOpenOpen, 0u, 0u));
-  EXPECT_EQ(m, uniform_lower_bound(IntervalOpenOpen, m, m));
-  EXPECT_EQ(m, uniform_lower_bound(IntervalOpenOpen, m - 1, m - 1));
-  EXPECT_EQ(0, uniform_upper_bound(IntervalOpenOpen, 0u, 0u));
-  EXPECT_EQ(m - 1, uniform_upper_bound(IntervalOpenOpen, m, m));
-
-  // int min/max
-  constexpr auto l = (std::numeric_limits<int64_t>::min)();
-  constexpr auto r = (std::numeric_limits<int64_t>::max)();
-  EXPECT_EQ(1, uniform_lower_bound(IntervalOpenOpen, 0, 0));
-  EXPECT_EQ(l + 1, uniform_lower_bound(IntervalOpenOpen, l, l));
-  EXPECT_EQ(r, uniform_lower_bound(IntervalOpenOpen, r - 1, r - 1));
-  EXPECT_EQ(r, uniform_lower_bound(IntervalOpenOpen, r, r));
-  EXPECT_EQ(-1, uniform_upper_bound(IntervalOpenOpen, 0, 0));
-  EXPECT_EQ(l, uniform_upper_bound(IntervalOpenOpen, l, l));
-  EXPECT_EQ(r - 1, uniform_upper_bound(IntervalOpenOpen, r, r));
-}
-
-TEST_F(UniformHelperTest, UniformBoundFunctionsRealBounds) {
-  // absl::uniform_real_distribution natively assumes IntervalClosedOpen;
-  // use the inverse here so each bound has to change.
-  constexpr IntervalOpenClosedTag IntervalOpenClosed;
-
-  // Edge cases: the next value toward itself is itself.
-  EXPECT_EQ(1.0, uniform_lower_bound(IntervalOpenClosed, 1.0, 1.0));
-  EXPECT_EQ(1.0f, uniform_lower_bound(IntervalOpenClosed, 1.0f, 1.0f));
-
-  // rightmost and leftmost finite values.
-  constexpr auto r = (std::numeric_limits<double>::max)();
-  const auto re = std::nexttoward(r, 0.0);
-  constexpr auto l = -r;
-  const auto le = std::nexttoward(l, 0.0);
-
-  EXPECT_EQ(l, uniform_lower_bound(IntervalOpenClosed, l, l));     // (l,l)
-  EXPECT_EQ(r, uniform_lower_bound(IntervalOpenClosed, r, r));     // (r,r)
-  EXPECT_EQ(le, uniform_lower_bound(IntervalOpenClosed, l, r));    // (l,r)
-  EXPECT_EQ(le, uniform_lower_bound(IntervalOpenClosed, l, 0.0));  // (l, 0)
-  EXPECT_EQ(le, uniform_lower_bound(IntervalOpenClosed, l, le));   // (l, le)
-  EXPECT_EQ(r, uniform_lower_bound(IntervalOpenClosed, re, r));    // (re, r)
-
-  EXPECT_EQ(le, uniform_upper_bound(IntervalOpenClosed, l, l));   // (l,l)
-  EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, r, r));    // (r,r)
-  EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, l, r));    // (l,r)
-  EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, l, re));   // (l,re)
-  EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, 0.0, r));  // (0, r)
-  EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, re, r));   // (re, r)
-  EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, le, re));  // (le, re)
-
-  const double e = std::nextafter(1.0, 2.0);  // 1 + epsilon
-  const double f = std::nextafter(1.0, 0.0);  // 1 - epsilon
-
-  // (1.0, 1.0 + epsilon)
-  EXPECT_EQ(e, uniform_lower_bound(IntervalOpenClosed, 1.0, e));
-  EXPECT_EQ(std::nextafter(e, 2.0),
-            uniform_upper_bound(IntervalOpenClosed, 1.0, e));
-
-  // (1.0-epsilon, 1.0)
-  EXPECT_EQ(1.0, uniform_lower_bound(IntervalOpenClosed, f, 1.0));
-  EXPECT_EQ(e, uniform_upper_bound(IntervalOpenClosed, f, 1.0));
-
-  // denorm cases.
-  const double g = std::numeric_limits<double>::denorm_min();
-  const double h = std::nextafter(g, 1.0);
-
-  // (0, denorm_min)
-  EXPECT_EQ(g, uniform_lower_bound(IntervalOpenClosed, 0.0, g));
-  EXPECT_EQ(h, uniform_upper_bound(IntervalOpenClosed, 0.0, g));
-
-  // (denorm_min, 1.0)
-  EXPECT_EQ(h, uniform_lower_bound(IntervalOpenClosed, g, 1.0));
-  EXPECT_EQ(e, uniform_upper_bound(IntervalOpenClosed, g, 1.0));
-
-  // Edge cases: invalid bounds.
-  EXPECT_EQ(f, uniform_lower_bound(IntervalOpenClosed, 1.0, -1.0));
-}
-
-struct Invalid {};
-
-template <typename A, typename B>
-auto InferredUniformReturnT(int) -> uniform_inferred_return_t<A, B>;
-
-template <typename, typename>
-Invalid InferredUniformReturnT(...);
-
-// Given types <A, B, Expect>, CheckArgsInferType() verifies that
-//
-//   uniform_inferred_return_t<A, B> and
-//   uniform_inferred_return_t<B, A>
-//
-// returns the type "Expect".
-//
-// This interface can also be used to assert that a given inferred return types
-// are invalid. Writing:
-//
-//   CheckArgsInferType<float, int, Invalid>()
-//
-// will assert that this overload does not exist.
-template <typename A, typename B, typename Expect>
-void CheckArgsInferType() {
-  static_assert(
-      absl::conjunction<
-          std::is_same<Expect, decltype(InferredUniformReturnT<A, B>(0))>,
-          std::is_same<Expect,
-                       decltype(InferredUniformReturnT<B, A>(0))>>::value,
-      "");
-}
-
-TEST_F(UniformHelperTest, UniformTypeInference) {
-  // Infers common types.
-  CheckArgsInferType<uint16_t, uint16_t, uint16_t>();
-  CheckArgsInferType<uint32_t, uint32_t, uint32_t>();
-  CheckArgsInferType<uint64_t, uint64_t, uint64_t>();
-  CheckArgsInferType<int16_t, int16_t, int16_t>();
-  CheckArgsInferType<int32_t, int32_t, int32_t>();
-  CheckArgsInferType<int64_t, int64_t, int64_t>();
-  CheckArgsInferType<float, float, float>();
-  CheckArgsInferType<double, double, double>();
-
-  // Properly promotes uint16_t.
-  CheckArgsInferType<uint16_t, uint32_t, uint32_t>();
-  CheckArgsInferType<uint16_t, uint64_t, uint64_t>();
-  CheckArgsInferType<uint16_t, int32_t, int32_t>();
-  CheckArgsInferType<uint16_t, int64_t, int64_t>();
-  CheckArgsInferType<uint16_t, float, float>();
-  CheckArgsInferType<uint16_t, double, double>();
-
-  // Properly promotes int16_t.
-  CheckArgsInferType<int16_t, int32_t, int32_t>();
-  CheckArgsInferType<int16_t, int64_t, int64_t>();
-  CheckArgsInferType<int16_t, float, float>();
-  CheckArgsInferType<int16_t, double, double>();
-
-  // Invalid (u)int16_t-pairings do not compile.
-  // See "CheckArgsInferType" comments above, for how this is achieved.
-  CheckArgsInferType<uint16_t, int16_t, Invalid>();
-  CheckArgsInferType<int16_t, uint32_t, Invalid>();
-  CheckArgsInferType<int16_t, uint64_t, Invalid>();
-
-  // Properly promotes uint32_t.
-  CheckArgsInferType<uint32_t, uint64_t, uint64_t>();
-  CheckArgsInferType<uint32_t, int64_t, int64_t>();
-  CheckArgsInferType<uint32_t, double, double>();
-
-  // Properly promotes int32_t.
-  CheckArgsInferType<int32_t, int64_t, int64_t>();
-  CheckArgsInferType<int32_t, double, double>();
-
-  // Invalid (u)int32_t-pairings do not compile.
-  CheckArgsInferType<uint32_t, int32_t, Invalid>();
-  CheckArgsInferType<int32_t, uint64_t, Invalid>();
-  CheckArgsInferType<int32_t, float, Invalid>();
-  CheckArgsInferType<uint32_t, float, Invalid>();
-
-  // Invalid (u)int64_t-pairings do not compile.
-  CheckArgsInferType<uint64_t, int64_t, Invalid>();
-  CheckArgsInferType<int64_t, float, Invalid>();
-  CheckArgsInferType<int64_t, double, Invalid>();
-
-  // Properly promotes float.
-  CheckArgsInferType<float, double, double>();
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/random/internal/wide_multiply.h b/third_party/abseil_cpp/absl/random/internal/wide_multiply.h
deleted file mode 100644
index 0afcbe08e229..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/wide_multiply.h
+++ /dev/null
@@ -1,111 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
-#define ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
-
-#include <cstdint>
-#include <limits>
-#include <type_traits>
-
-#if (defined(_WIN32) || defined(_WIN64)) && defined(_M_IA64)
-#include <intrin.h>  // NOLINT(build/include_order)
-#pragma intrinsic(_umul128)
-#define ABSL_INTERNAL_USE_UMUL128 1
-#endif
-
-#include "absl/base/config.h"
-#include "absl/base/internal/bits.h"
-#include "absl/numeric/int128.h"
-#include "absl/random/internal/traits.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-// Helper object to multiply two 64-bit values to a 128-bit value.
-// MultiplyU64ToU128 multiplies two 64-bit values to a 128-bit value.
-// If an intrinsic is available, it is used, otherwise use native 32-bit
-// multiplies to construct the result.
-inline absl::uint128 MultiplyU64ToU128(uint64_t a, uint64_t b) {
-#if defined(ABSL_HAVE_INTRINSIC_INT128)
-  return absl::uint128(static_cast<__uint128_t>(a) * b);
-#elif defined(ABSL_INTERNAL_USE_UMUL128)
-  // uint64_t * uint64_t => uint128 multiply using imul intrinsic on MSVC.
-  uint64_t high = 0;
-  const uint64_t low = _umul128(a, b, &high);
-  return absl::MakeUint128(high, low);
-#else
-  // uint128(a) * uint128(b) in emulated mode computes a full 128-bit x 128-bit
-  // multiply.  However there are many cases where that is not necessary, and it
-  // is only necessary to support a 64-bit x 64-bit = 128-bit multiply.  This is
-  // for those cases.
-  const uint64_t a00 = static_cast<uint32_t>(a);
-  const uint64_t a32 = a >> 32;
-  const uint64_t b00 = static_cast<uint32_t>(b);
-  const uint64_t b32 = b >> 32;
-
-  const uint64_t c00 = a00 * b00;
-  const uint64_t c32a = a00 * b32;
-  const uint64_t c32b = a32 * b00;
-  const uint64_t c64 = a32 * b32;
-
-  const uint32_t carry =
-      static_cast<uint32_t>(((c00 >> 32) + static_cast<uint32_t>(c32a) +
-                             static_cast<uint32_t>(c32b)) >>
-                            32);
-
-  return absl::MakeUint128(c64 + (c32a >> 32) + (c32b >> 32) + carry,
-                           c00 + (c32a << 32) + (c32b << 32));
-#endif
-}
-
-// wide_multiply<T> multiplies two N-bit values to a 2N-bit result.
-template <typename UIntType>
-struct wide_multiply {
-  static constexpr size_t kN = std::numeric_limits<UIntType>::digits;
-  using input_type = UIntType;
-  using result_type = typename random_internal::unsigned_bits<kN * 2>::type;
-
-  static result_type multiply(input_type a, input_type b) {
-    return static_cast<result_type>(a) * b;
-  }
-
-  static input_type hi(result_type r) { return r >> kN; }
-  static input_type lo(result_type r) { return r; }
-
-  static_assert(std::is_unsigned<UIntType>::value,
-                "Class-template wide_multiply<> argument must be unsigned.");
-};
-
-#ifndef ABSL_HAVE_INTRINSIC_INT128
-template <>
-struct wide_multiply<uint64_t> {
-  using input_type = uint64_t;
-  using result_type = absl::uint128;
-
-  static result_type multiply(uint64_t a, uint64_t b) {
-    return MultiplyU64ToU128(a, b);
-  }
-
-  static uint64_t hi(result_type r) { return absl::Uint128High64(r); }
-  static uint64_t lo(result_type r) { return absl::Uint128Low64(r); }
-};
-#endif
-
-}  // namespace random_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
diff --git a/third_party/abseil_cpp/absl/random/internal/wide_multiply_test.cc b/third_party/abseil_cpp/absl/random/internal/wide_multiply_test.cc
deleted file mode 100644
index ca8ce923b710..000000000000
--- a/third_party/abseil_cpp/absl/random/internal/wide_multiply_test.cc
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/random/internal/wide_multiply.h"
-
-#include "gtest/gtest.h"
-#include "absl/base/internal/bits.h"
-#include "absl/numeric/int128.h"
-
-using absl::random_internal::MultiplyU64ToU128;
-
-namespace {
-
-TEST(WideMultiplyTest, MultiplyU64ToU128Test) {
-  constexpr uint64_t k1 = 1;
-  constexpr uint64_t kMax = ~static_cast<uint64_t>(0);
-
-  EXPECT_EQ(absl::uint128(0), MultiplyU64ToU128(0, 0));
-
-  // Max uint64_t
-  EXPECT_EQ(MultiplyU64ToU128(kMax, kMax),
-            absl::MakeUint128(0xfffffffffffffffe, 0x0000000000000001));
-  EXPECT_EQ(absl::MakeUint128(0, kMax), MultiplyU64ToU128(kMax, 1));
-  EXPECT_EQ(absl::MakeUint128(0, kMax), MultiplyU64ToU128(1, kMax));
-  for (int i = 0; i < 64; ++i) {
-    EXPECT_EQ(absl::MakeUint128(0, kMax) << i,
-              MultiplyU64ToU128(kMax, k1 << i));
-    EXPECT_EQ(absl::MakeUint128(0, kMax) << i,
-              MultiplyU64ToU128(k1 << i, kMax));
-  }
-
-  // 1-bit x 1-bit.
-  for (int i = 0; i < 64; ++i) {
-    for (int j = 0; j < 64; ++j) {
-      EXPECT_EQ(absl::MakeUint128(0, 1) << (i + j),
-                MultiplyU64ToU128(k1 << i, k1 << j));
-      EXPECT_EQ(absl::MakeUint128(0, 1) << (i + j),
-                MultiplyU64ToU128(k1 << i, k1 << j));
-    }
-  }
-
-  // Verified multiplies
-  EXPECT_EQ(MultiplyU64ToU128(0xffffeeeeddddcccc, 0xbbbbaaaa99998888),
-            absl::MakeUint128(0xbbbb9e2692c5dddc, 0xc28f7531048d2c60));
-  EXPECT_EQ(MultiplyU64ToU128(0x0123456789abcdef, 0xfedcba9876543210),
-            absl::MakeUint128(0x0121fa00ad77d742, 0x2236d88fe5618cf0));
-  EXPECT_EQ(MultiplyU64ToU128(0x0123456789abcdef, 0xfdb97531eca86420),
-            absl::MakeUint128(0x0120ae99d26725fc, 0xce197f0ecac319e0));
-  EXPECT_EQ(MultiplyU64ToU128(0x97a87f4f261ba3f2, 0xfedcba9876543210),
-            absl::MakeUint128(0x96fbf1a8ae78d0ba, 0x5a6dd4b71f278320));
-  EXPECT_EQ(MultiplyU64ToU128(0xfedcba9876543210, 0xfdb97531eca86420),
-            absl::MakeUint128(0xfc98c6981a413e22, 0x342d0bbf48948200));
-}
-
-}  // namespace