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>

72 files changed, 0 insertions, 10042 deletions

diff --git a/third_party/abseil_cpp/absl/base/internal/atomic_hook.h b/third_party/abseil_cpp/absl/base/internal/atomic_hook.h
deleted file mode 100644
index ae21cd7fe50a..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/atomic_hook.h
+++ /dev/null
@@ -1,200 +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_BASE_INTERNAL_ATOMIC_HOOK_H_
-#define ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_
-
-#include <atomic>
-#include <cassert>
-#include <cstdint>
-#include <utility>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-
-#if defined(_MSC_VER) && !defined(__clang__)
-#define ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT 0
-#else
-#define ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT 1
-#endif
-
-#if defined(_MSC_VER)
-#define ABSL_HAVE_WORKING_ATOMIC_POINTER 0
-#else
-#define ABSL_HAVE_WORKING_ATOMIC_POINTER 1
-#endif
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-template <typename T>
-class AtomicHook;
-
-// To workaround AtomicHook not being constant-initializable on some platforms,
-// prefer to annotate instances with `ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES`
-// instead of `ABSL_CONST_INIT`.
-#if ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
-#define ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_CONST_INIT
-#else
-#define ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
-#endif
-
-// `AtomicHook` is a helper class, templatized on a raw function pointer type,
-// for implementing Abseil customization hooks.  It is a callable object that
-// dispatches to the registered hook.  Objects of type `AtomicHook` must have
-// static or thread storage duration.
-//
-// A default constructed object performs a no-op (and returns a default
-// constructed object) if no hook has been registered.
-//
-// Hooks can be pre-registered via constant initialization, for example:
-//
-// ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static AtomicHook<void(*)()>
-//     my_hook(DefaultAction);
-//
-// and then changed at runtime via a call to `Store()`.
-//
-// Reads and writes guarantee memory_order_acquire/memory_order_release
-// semantics.
-template <typename ReturnType, typename... Args>
-class AtomicHook<ReturnType (*)(Args...)> {
- public:
-  using FnPtr = ReturnType (*)(Args...);
-
-  // Constructs an object that by default performs a no-op (and
-  // returns a default constructed object) when no hook as been registered.
-  constexpr AtomicHook() : AtomicHook(DummyFunction) {}
-
-  // Constructs an object that by default dispatches to/returns the
-  // pre-registered default_fn when no hook has been registered at runtime.
-#if ABSL_HAVE_WORKING_ATOMIC_POINTER && ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
-  explicit constexpr AtomicHook(FnPtr default_fn)
-      : hook_(default_fn), default_fn_(default_fn) {}
-#elif ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
-  explicit constexpr AtomicHook(FnPtr default_fn)
-      : hook_(kUninitialized), default_fn_(default_fn) {}
-#else
-  // As of January 2020, on all known versions of MSVC this constructor runs in
-  // the global constructor sequence.  If `Store()` is called by a dynamic
-  // initializer, we want to preserve the value, even if this constructor runs
-  // after the call to `Store()`.  If not, `hook_` will be
-  // zero-initialized by the linker and we have no need to set it.
-  // https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
-  explicit constexpr AtomicHook(FnPtr default_fn)
-      : /* hook_(deliberately omitted), */ default_fn_(default_fn) {
-    static_assert(kUninitialized == 0, "here we rely on zero-initialization");
-  }
-#endif
-
-  // Stores the provided function pointer as the value for this hook.
-  //
-  // This is intended to be called once.  Multiple calls are legal only if the
-  // same function pointer is provided for each call.  The store is implemented
-  // as a memory_order_release operation, and read accesses are implemented as
-  // memory_order_acquire.
-  void Store(FnPtr fn) {
-    bool success = DoStore(fn);
-    static_cast<void>(success);
-    assert(success);
-  }
-
-  // Invokes the registered callback.  If no callback has yet been registered, a
-  // default-constructed object of the appropriate type is returned instead.
-  template <typename... CallArgs>
-  ReturnType operator()(CallArgs&&... args) const {
-    return DoLoad()(std::forward<CallArgs>(args)...);
-  }
-
-  // Returns the registered callback, or nullptr if none has been registered.
-  // Useful if client code needs to conditionalize behavior based on whether a
-  // callback was registered.
-  //
-  // Note that atomic_hook.Load()() and atomic_hook() have different semantics:
-  // operator()() will perform a no-op if no callback was registered, while
-  // Load()() will dereference a null function pointer.  Prefer operator()() to
-  // Load()() unless you must conditionalize behavior on whether a hook was
-  // registered.
-  FnPtr Load() const {
-    FnPtr ptr = DoLoad();
-    return (ptr == DummyFunction) ? nullptr : ptr;
-  }
-
- private:
-  static ReturnType DummyFunction(Args...) {
-    return ReturnType();
-  }
-
-  // Current versions of MSVC (as of September 2017) have a broken
-  // implementation of std::atomic<T*>:  Its constructor attempts to do the
-  // equivalent of a reinterpret_cast in a constexpr context, which is not
-  // allowed.
-  //
-  // This causes an issue when building with LLVM under Windows.  To avoid this,
-  // we use a less-efficient, intptr_t-based implementation on Windows.
-#if ABSL_HAVE_WORKING_ATOMIC_POINTER
-  // Return the stored value, or DummyFunction if no value has been stored.
-  FnPtr DoLoad() const { return hook_.load(std::memory_order_acquire); }
-
-  // Store the given value.  Returns false if a different value was already
-  // stored to this object.
-  bool DoStore(FnPtr fn) {
-    assert(fn);
-    FnPtr expected = default_fn_;
-    const bool store_succeeded = hook_.compare_exchange_strong(
-        expected, fn, std::memory_order_acq_rel, std::memory_order_acquire);
-    const bool same_value_already_stored = (expected == fn);
-    return store_succeeded || same_value_already_stored;
-  }
-
-  std::atomic<FnPtr> hook_;
-#else  // !ABSL_HAVE_WORKING_ATOMIC_POINTER
-  // Use a sentinel value unlikely to be the address of an actual function.
-  static constexpr intptr_t kUninitialized = 0;
-
-  static_assert(sizeof(intptr_t) >= sizeof(FnPtr),
-                "intptr_t can't contain a function pointer");
-
-  FnPtr DoLoad() const {
-    const intptr_t value = hook_.load(std::memory_order_acquire);
-    if (value == kUninitialized) {
-      return default_fn_;
-    }
-    return reinterpret_cast<FnPtr>(value);
-  }
-
-  bool DoStore(FnPtr fn) {
-    assert(fn);
-    const auto value = reinterpret_cast<intptr_t>(fn);
-    intptr_t expected = kUninitialized;
-    const bool store_succeeded = hook_.compare_exchange_strong(
-        expected, value, std::memory_order_acq_rel, std::memory_order_acquire);
-    const bool same_value_already_stored = (expected == value);
-    return store_succeeded || same_value_already_stored;
-  }
-
-  std::atomic<intptr_t> hook_;
-#endif
-
-  const FnPtr default_fn_;
-};
-
-#undef ABSL_HAVE_WORKING_ATOMIC_POINTER
-#undef ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/atomic_hook_test.cc b/third_party/abseil_cpp/absl/base/internal/atomic_hook_test.cc
deleted file mode 100644
index e577a8fd930b..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/atomic_hook_test.cc
+++ /dev/null
@@ -1,97 +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/base/internal/atomic_hook.h"
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/base/attributes.h"
-#include "absl/base/internal/atomic_hook_test_helper.h"
-
-namespace {
-
-using ::testing::Eq;
-
-int value = 0;
-void TestHook(int x) { value = x; }
-
-TEST(AtomicHookTest, NoDefaultFunction) {
-  ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
-      void (*)(int)>
-      hook;
-  value = 0;
-
-  // Test the default DummyFunction.
-  EXPECT_TRUE(hook.Load() == nullptr);
-  EXPECT_EQ(value, 0);
-  hook(1);
-  EXPECT_EQ(value, 0);
-
-  // Test a stored hook.
-  hook.Store(TestHook);
-  EXPECT_TRUE(hook.Load() == TestHook);
-  EXPECT_EQ(value, 0);
-  hook(1);
-  EXPECT_EQ(value, 1);
-
-  // Calling Store() with the same hook should not crash.
-  hook.Store(TestHook);
-  EXPECT_TRUE(hook.Load() == TestHook);
-  EXPECT_EQ(value, 1);
-  hook(2);
-  EXPECT_EQ(value, 2);
-}
-
-TEST(AtomicHookTest, WithDefaultFunction) {
-  // Set the default value to TestHook at compile-time.
-  ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
-      void (*)(int)>
-      hook(TestHook);
-  value = 0;
-
-  // Test the default value is TestHook.
-  EXPECT_TRUE(hook.Load() == TestHook);
-  EXPECT_EQ(value, 0);
-  hook(1);
-  EXPECT_EQ(value, 1);
-
-  // Calling Store() with the same hook should not crash.
-  hook.Store(TestHook);
-  EXPECT_TRUE(hook.Load() == TestHook);
-  EXPECT_EQ(value, 1);
-  hook(2);
-  EXPECT_EQ(value, 2);
-}
-
-ABSL_CONST_INIT int override_func_calls = 0;
-void OverrideFunc() { override_func_calls++; }
-static struct OverrideInstaller {
-  OverrideInstaller() { absl::atomic_hook_internal::func.Store(OverrideFunc); }
-} override_installer;
-
-TEST(AtomicHookTest, DynamicInitFromAnotherTU) {
-  // MSVC 14.2 doesn't do constexpr static init correctly; in particular it
-  // tends to sequence static init (i.e. defaults) of `AtomicHook` objects
-  // after their dynamic init (i.e. overrides), overwriting whatever value was
-  // written during dynamic init.  This regression test validates the fix.
-  // https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
-  EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
-  EXPECT_THAT(override_func_calls, Eq(0));
-  absl::atomic_hook_internal::func();
-  EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
-  EXPECT_THAT(override_func_calls, Eq(1));
-  EXPECT_THAT(absl::atomic_hook_internal::func.Load(), Eq(OverrideFunc));
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/atomic_hook_test_helper.cc b/third_party/abseil_cpp/absl/base/internal/atomic_hook_test_helper.cc
deleted file mode 100644
index 537d47cd2d2f..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/atomic_hook_test_helper.cc
+++ /dev/null
@@ -1,32 +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/base/internal/atomic_hook_test_helper.h"
-
-#include "absl/base/attributes.h"
-#include "absl/base/internal/atomic_hook.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace atomic_hook_internal {
-
-ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES absl::base_internal::AtomicHook<VoidF>
-    func(DefaultFunc);
-ABSL_CONST_INIT int default_func_calls = 0;
-void DefaultFunc() { default_func_calls++; }
-void RegisterFunc(VoidF f) { func.Store(f); }
-
-}  // namespace atomic_hook_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/atomic_hook_test_helper.h b/third_party/abseil_cpp/absl/base/internal/atomic_hook_test_helper.h
deleted file mode 100644
index 3e72b4977d2f..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/atomic_hook_test_helper.h
+++ /dev/null
@@ -1,34 +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_BASE_ATOMIC_HOOK_TEST_HELPER_H_
-#define ABSL_BASE_ATOMIC_HOOK_TEST_HELPER_H_
-
-#include "absl/base/internal/atomic_hook.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace atomic_hook_internal {
-
-using VoidF = void (*)();
-extern absl::base_internal::AtomicHook<VoidF> func;
-extern int default_func_calls;
-void DefaultFunc();
-void RegisterFunc(VoidF func);
-
-}  // namespace atomic_hook_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_ATOMIC_HOOK_TEST_HELPER_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/bits.h b/third_party/abseil_cpp/absl/base/internal/bits.h
deleted file mode 100644
index 81648e2c3957..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/bits.h
+++ /dev/null
@@ -1,219 +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_BASE_INTERNAL_BITS_H_
-#define ABSL_BASE_INTERNAL_BITS_H_
-
-// This file contains bitwise ops which are implementation details of various
-// absl libraries.
-
-#include <cstdint>
-
-#include "absl/base/config.h"
-
-// Clang on Windows has __builtin_clzll; otherwise we need to use the
-// windows intrinsic functions.
-#if defined(_MSC_VER) && !defined(__clang__)
-#include <intrin.h>
-#if defined(_M_X64)
-#pragma intrinsic(_BitScanReverse64)
-#pragma intrinsic(_BitScanForward64)
-#endif
-#pragma intrinsic(_BitScanReverse)
-#pragma intrinsic(_BitScanForward)
-#endif
-
-#include "absl/base/attributes.h"
-
-#if defined(_MSC_VER) && !defined(__clang__)
-// 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_BASE_INTERNAL_FORCEINLINE __forceinline
-#else
-// Use default attribute inline.
-#define ABSL_BASE_INTERNAL_FORCEINLINE inline ABSL_ATTRIBUTE_ALWAYS_INLINE
-#endif
-
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64Slow(uint64_t n) {
-  int zeroes = 60;
-  if (n >> 32) {
-    zeroes -= 32;
-    n >>= 32;
-  }
-  if (n >> 16) {
-    zeroes -= 16;
-    n >>= 16;
-  }
-  if (n >> 8) {
-    zeroes -= 8;
-    n >>= 8;
-  }
-  if (n >> 4) {
-    zeroes -= 4;
-    n >>= 4;
-  }
-  return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
-}
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) {
-#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_X64)
-  // MSVC does not have __buitin_clzll. Use _BitScanReverse64.
-  unsigned long result = 0;  // NOLINT(runtime/int)
-  if (_BitScanReverse64(&result, n)) {
-    return 63 - result;
-  }
-  return 64;
-#elif defined(_MSC_VER) && !defined(__clang__)
-  // MSVC does not have __buitin_clzll. Compose two calls to _BitScanReverse
-  unsigned long result = 0;  // NOLINT(runtime/int)
-  if ((n >> 32) &&
-      _BitScanReverse(&result, static_cast<unsigned long>(n >> 32))) {
-    return 31 - result;
-  }
-  if (_BitScanReverse(&result, static_cast<unsigned long>(n))) {
-    return 63 - result;
-  }
-  return 64;
-#elif defined(__GNUC__) || defined(__clang__)
-  // Use __builtin_clzll, which uses the following instructions:
-  //  x86: bsr
-  //  ARM64: clz
-  //  PPC: cntlzd
-  static_assert(sizeof(unsigned long long) == sizeof(n),  // NOLINT(runtime/int)
-                "__builtin_clzll does not take 64-bit arg");
-
-  // Handle 0 as a special case because __builtin_clzll(0) is undefined.
-  if (n == 0) {
-    return 64;
-  }
-  return __builtin_clzll(n);
-#else
-  return CountLeadingZeros64Slow(n);
-#endif
-}
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32Slow(uint64_t n) {
-  int zeroes = 28;
-  if (n >> 16) {
-    zeroes -= 16;
-    n >>= 16;
-  }
-  if (n >> 8) {
-    zeroes -= 8;
-    n >>= 8;
-  }
-  if (n >> 4) {
-    zeroes -= 4;
-    n >>= 4;
-  }
-  return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
-}
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32(uint32_t n) {
-#if defined(_MSC_VER) && !defined(__clang__)
-  unsigned long result = 0;  // NOLINT(runtime/int)
-  if (_BitScanReverse(&result, n)) {
-    return 31 - result;
-  }
-  return 32;
-#elif defined(__GNUC__) || defined(__clang__)
-  // Use __builtin_clz, which uses the following instructions:
-  //  x86: bsr
-  //  ARM64: clz
-  //  PPC: cntlzd
-  static_assert(sizeof(int) == sizeof(n),
-                "__builtin_clz does not take 32-bit arg");
-
-  // Handle 0 as a special case because __builtin_clz(0) is undefined.
-  if (n == 0) {
-    return 32;
-  }
-  return __builtin_clz(n);
-#else
-  return CountLeadingZeros32Slow(n);
-#endif
-}
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64Slow(uint64_t n) {
-  int c = 63;
-  n &= ~n + 1;
-  if (n & 0x00000000FFFFFFFF) c -= 32;
-  if (n & 0x0000FFFF0000FFFF) c -= 16;
-  if (n & 0x00FF00FF00FF00FF) c -= 8;
-  if (n & 0x0F0F0F0F0F0F0F0F) c -= 4;
-  if (n & 0x3333333333333333) c -= 2;
-  if (n & 0x5555555555555555) c -= 1;
-  return c;
-}
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) {
-#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_X64)
-  unsigned long result = 0;  // NOLINT(runtime/int)
-  _BitScanForward64(&result, n);
-  return result;
-#elif defined(_MSC_VER) && !defined(__clang__)
-  unsigned long result = 0;  // NOLINT(runtime/int)
-  if (static_cast<uint32_t>(n) == 0) {
-    _BitScanForward(&result, static_cast<unsigned long>(n >> 32));
-    return result + 32;
-  }
-  _BitScanForward(&result, static_cast<unsigned long>(n));
-  return result;
-#elif defined(__GNUC__) || defined(__clang__)
-  static_assert(sizeof(unsigned long long) == sizeof(n),  // NOLINT(runtime/int)
-                "__builtin_ctzll does not take 64-bit arg");
-  return __builtin_ctzll(n);
-#else
-  return CountTrailingZerosNonZero64Slow(n);
-#endif
-}
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32Slow(uint32_t n) {
-  int c = 31;
-  n &= ~n + 1;
-  if (n & 0x0000FFFF) c -= 16;
-  if (n & 0x00FF00FF) c -= 8;
-  if (n & 0x0F0F0F0F) c -= 4;
-  if (n & 0x33333333) c -= 2;
-  if (n & 0x55555555) c -= 1;
-  return c;
-}
-
-ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32(uint32_t n) {
-#if defined(_MSC_VER) && !defined(__clang__)
-  unsigned long result = 0;  // NOLINT(runtime/int)
-  _BitScanForward(&result, n);
-  return result;
-#elif defined(__GNUC__) || defined(__clang__)
-  static_assert(sizeof(int) == sizeof(n),
-                "__builtin_ctz does not take 32-bit arg");
-  return __builtin_ctz(n);
-#else
-  return CountTrailingZerosNonZero32Slow(n);
-#endif
-}
-
-#undef ABSL_BASE_INTERNAL_FORCEINLINE
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_BITS_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/bits_test.cc b/third_party/abseil_cpp/absl/base/internal/bits_test.cc
deleted file mode 100644
index 7855fa629724..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/bits_test.cc
+++ /dev/null
@@ -1,97 +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/base/internal/bits.h"
-
-#include "gtest/gtest.h"
-
-namespace {
-
-int CLZ64(uint64_t n) {
-  int fast = absl::base_internal::CountLeadingZeros64(n);
-  int slow = absl::base_internal::CountLeadingZeros64Slow(n);
-  EXPECT_EQ(fast, slow) << n;
-  return fast;
-}
-
-TEST(BitsTest, CountLeadingZeros64) {
-  EXPECT_EQ(64, CLZ64(uint64_t{}));
-  EXPECT_EQ(0, CLZ64(~uint64_t{}));
-
-  for (int index = 0; index < 64; index++) {
-    uint64_t x = static_cast<uint64_t>(1) << index;
-    const auto cnt = 63 - index;
-    ASSERT_EQ(cnt, CLZ64(x)) << index;
-    ASSERT_EQ(cnt, CLZ64(x + x - 1)) << index;
-  }
-}
-
-int CLZ32(uint32_t n) {
-  int fast = absl::base_internal::CountLeadingZeros32(n);
-  int slow = absl::base_internal::CountLeadingZeros32Slow(n);
-  EXPECT_EQ(fast, slow) << n;
-  return fast;
-}
-
-TEST(BitsTest, CountLeadingZeros32) {
-  EXPECT_EQ(32, CLZ32(uint32_t{}));
-  EXPECT_EQ(0, CLZ32(~uint32_t{}));
-
-  for (int index = 0; index < 32; index++) {
-    uint32_t x = static_cast<uint32_t>(1) << index;
-    const auto cnt = 31 - index;
-    ASSERT_EQ(cnt, CLZ32(x)) << index;
-    ASSERT_EQ(cnt, CLZ32(x + x - 1)) << index;
-    ASSERT_EQ(CLZ64(x), CLZ32(x) + 32);
-  }
-}
-
-int CTZ64(uint64_t n) {
-  int fast = absl::base_internal::CountTrailingZerosNonZero64(n);
-  int slow = absl::base_internal::CountTrailingZerosNonZero64Slow(n);
-  EXPECT_EQ(fast, slow) << n;
-  return fast;
-}
-
-TEST(BitsTest, CountTrailingZerosNonZero64) {
-  EXPECT_EQ(0, CTZ64(~uint64_t{}));
-
-  for (int index = 0; index < 64; index++) {
-    uint64_t x = static_cast<uint64_t>(1) << index;
-    const auto cnt = index;
-    ASSERT_EQ(cnt, CTZ64(x)) << index;
-    ASSERT_EQ(cnt, CTZ64(~(x - 1))) << index;
-  }
-}
-
-int CTZ32(uint32_t n) {
-  int fast = absl::base_internal::CountTrailingZerosNonZero32(n);
-  int slow = absl::base_internal::CountTrailingZerosNonZero32Slow(n);
-  EXPECT_EQ(fast, slow) << n;
-  return fast;
-}
-
-TEST(BitsTest, CountTrailingZerosNonZero32) {
-  EXPECT_EQ(0, CTZ32(~uint32_t{}));
-
-  for (int index = 0; index < 32; index++) {
-    uint32_t x = static_cast<uint32_t>(1) << index;
-    const auto cnt = index;
-    ASSERT_EQ(cnt, CTZ32(x)) << index;
-    ASSERT_EQ(cnt, CTZ32(~(x - 1))) << index;
-  }
-}
-
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/cmake_thread_test.cc b/third_party/abseil_cpp/absl/base/internal/cmake_thread_test.cc
deleted file mode 100644
index f70bb24eb7b4..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/cmake_thread_test.cc
+++ /dev/null
@@ -1,22 +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 <iostream>
-#include "absl/base/internal/thread_identity.h"
-
-int main() {
-  auto* tid = absl::base_internal::CurrentThreadIdentityIfPresent();
-  // Make sure the above call can't be optimized out
-  std::cout << (void*)tid << std::endl;
-}
diff --git a/third_party/abseil_cpp/absl/base/internal/cycleclock.cc b/third_party/abseil_cpp/absl/base/internal/cycleclock.cc
deleted file mode 100644
index 0e65005b8914..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/cycleclock.cc
+++ /dev/null
@@ -1,107 +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.
-
-// The implementation of CycleClock::Frequency.
-//
-// NOTE: only i386 and x86_64 have been well tested.
-// PPC, sparc, alpha, and ia64 are based on
-//    http://peter.kuscsik.com/wordpress/?p=14
-// with modifications by m3b.  See also
-//    https://setisvn.ssl.berkeley.edu/svn/lib/fftw-3.0.1/kernel/cycle.h
-
-#include "absl/base/internal/cycleclock.h"
-
-#include <atomic>
-#include <chrono>  // NOLINT(build/c++11)
-
-#include "absl/base/internal/unscaledcycleclock.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-#if ABSL_USE_UNSCALED_CYCLECLOCK
-
-namespace {
-
-#ifdef NDEBUG
-#ifdef ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
-// Not debug mode and the UnscaledCycleClock frequency is the CPU
-// frequency.  Scale the CycleClock to prevent overflow if someone
-// tries to represent the time as cycles since the Unix epoch.
-static constexpr int32_t kShift = 1;
-#else
-// Not debug mode and the UnscaledCycleClock isn't operating at the
-// raw CPU frequency. There is no need to do any scaling, so don't
-// needlessly sacrifice precision.
-static constexpr int32_t kShift = 0;
-#endif
-#else
-// In debug mode use a different shift to discourage depending on a
-// particular shift value.
-static constexpr int32_t kShift = 2;
-#endif
-
-static constexpr double kFrequencyScale = 1.0 / (1 << kShift);
-static std::atomic<CycleClockSourceFunc> cycle_clock_source;
-
-CycleClockSourceFunc LoadCycleClockSource() {
-  // Optimize for the common case (no callback) by first doing a relaxed load;
-  // this is significantly faster on non-x86 platforms.
-  if (cycle_clock_source.load(std::memory_order_relaxed) == nullptr) {
-    return nullptr;
-  }
-  // This corresponds to the store(std::memory_order_release) in
-  // CycleClockSource::Register, and makes sure that any updates made prior to
-  // registering the callback are visible to this thread before the callback is
-  // invoked.
-  return cycle_clock_source.load(std::memory_order_acquire);
-}
-
-}  // namespace
-
-int64_t CycleClock::Now() {
-  auto fn = LoadCycleClockSource();
-  if (fn == nullptr) {
-    return base_internal::UnscaledCycleClock::Now() >> kShift;
-  }
-  return fn() >> kShift;
-}
-
-double CycleClock::Frequency() {
-  return kFrequencyScale * base_internal::UnscaledCycleClock::Frequency();
-}
-
-void CycleClockSource::Register(CycleClockSourceFunc source) {
-  // Corresponds to the load(std::memory_order_acquire) in LoadCycleClockSource.
-  cycle_clock_source.store(source, std::memory_order_release);
-}
-
-#else
-
-int64_t CycleClock::Now() {
-  return std::chrono::duration_cast<std::chrono::nanoseconds>(
-             std::chrono::steady_clock::now().time_since_epoch())
-      .count();
-}
-
-double CycleClock::Frequency() {
-  return 1e9;
-}
-
-#endif
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/cycleclock.h b/third_party/abseil_cpp/absl/base/internal/cycleclock.h
deleted file mode 100644
index a18b58444560..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/cycleclock.h
+++ /dev/null
@@ -1,94 +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.
-//
-
-// -----------------------------------------------------------------------------
-// File: cycleclock.h
-// -----------------------------------------------------------------------------
-//
-// This header file defines a `CycleClock`, which yields the value and frequency
-// of a cycle counter that increments at a rate that is approximately constant.
-//
-// NOTE:
-//
-// The cycle counter frequency is not necessarily related to the core clock
-// frequency and should not be treated as such. That is, `CycleClock` cycles are
-// not necessarily "CPU cycles" and code should not rely on that behavior, even
-// if experimentally observed.
-//
-// An arbitrary offset may have been added to the counter at power on.
-//
-// On some platforms, the rate and offset of the counter may differ
-// slightly when read from different CPUs of a multiprocessor. Usually,
-// we try to ensure that the operating system adjusts values periodically
-// so that values agree approximately.   If you need stronger guarantees,
-// consider using alternate interfaces.
-//
-// The CPU is not required to maintain the ordering of a cycle counter read
-// with respect to surrounding instructions.
-
-#ifndef ABSL_BASE_INTERNAL_CYCLECLOCK_H_
-#define ABSL_BASE_INTERNAL_CYCLECLOCK_H_
-
-#include <cstdint>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// -----------------------------------------------------------------------------
-// CycleClock
-// -----------------------------------------------------------------------------
-class CycleClock {
- public:
-  // CycleClock::Now()
-  //
-  // Returns the value of a cycle counter that counts at a rate that is
-  // approximately constant.
-  static int64_t Now();
-
-  // CycleClock::Frequency()
-  //
-  // Returns the amount by which `CycleClock::Now()` increases per second. Note
-  // that this value may not necessarily match the core CPU clock frequency.
-  static double Frequency();
-
- private:
-  CycleClock() = delete;  // no instances
-  CycleClock(const CycleClock&) = delete;
-  CycleClock& operator=(const CycleClock&) = delete;
-};
-
-using CycleClockSourceFunc = int64_t (*)();
-
-class CycleClockSource {
- private:
-  // CycleClockSource::Register()
-  //
-  // Register a function that provides an alternate source for the unscaled CPU
-  // cycle count value. The source function must be async signal safe, must not
-  // call CycleClock::Now(), and must have a frequency that matches that of the
-  // unscaled clock used by CycleClock. A nullptr value resets CycleClock to use
-  // the default source.
-  static void Register(CycleClockSourceFunc source);
-};
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_CYCLECLOCK_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/direct_mmap.h b/third_party/abseil_cpp/absl/base/internal/direct_mmap.h
deleted file mode 100644
index 16accf096604..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/direct_mmap.h
+++ /dev/null
@@ -1,166 +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.
-//
-// Functions for directly invoking mmap() via syscall, avoiding the case where
-// mmap() has been locally overridden.
-
-#ifndef ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
-#define ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
-
-#include "absl/base/config.h"
-
-#if ABSL_HAVE_MMAP
-
-#include <sys/mman.h>
-
-#ifdef __linux__
-
-#include <sys/types.h>
-#ifdef __BIONIC__
-#include <sys/syscall.h>
-#else
-#include <syscall.h>
-#endif
-
-#include <linux/unistd.h>
-#include <unistd.h>
-#include <cerrno>
-#include <cstdarg>
-#include <cstdint>
-
-#ifdef __mips__
-// Include definitions of the ABI currently in use.
-#ifdef __BIONIC__
-// Android doesn't have sgidefs.h, but does have asm/sgidefs.h, which has the
-// definitions we need.
-#include <asm/sgidefs.h>
-#else
-#include <sgidefs.h>
-#endif  // __BIONIC__
-#endif  // __mips__
-
-// SYS_mmap and SYS_munmap are not defined in Android.
-#ifdef __BIONIC__
-extern "C" void* __mmap2(void*, size_t, int, int, int, size_t);
-#if defined(__NR_mmap) && !defined(SYS_mmap)
-#define SYS_mmap __NR_mmap
-#endif
-#ifndef SYS_munmap
-#define SYS_munmap __NR_munmap
-#endif
-#endif  // __BIONIC__
-
-#if defined(__NR_mmap2) && !defined(SYS_mmap2)
-#define SYS_mmap2 __NR_mmap2
-#endif
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// Platform specific logic extracted from
-// https://chromium.googlesource.com/linux-syscall-support/+/master/linux_syscall_support.h
-inline void* DirectMmap(void* start, size_t length, int prot, int flags, int fd,
-                        off64_t offset) noexcept {
-#if defined(__i386__) || defined(__ARM_ARCH_3__) || defined(__ARM_EABI__) || \
-    (defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) ||                   \
-    (defined(__PPC__) && !defined(__PPC64__)) ||                             \
-    (defined(__riscv) && __riscv_xlen == 32) ||                              \
-    (defined(__s390__) && !defined(__s390x__))
-  // On these architectures, implement mmap with mmap2.
-  static int pagesize = 0;
-  if (pagesize == 0) {
-#if defined(__wasm__) || defined(__asmjs__)
-    pagesize = getpagesize();
-#else
-    pagesize = sysconf(_SC_PAGESIZE);
-#endif
-  }
-  if (offset < 0 || offset % pagesize != 0) {
-    errno = EINVAL;
-    return MAP_FAILED;
-  }
-#ifdef __BIONIC__
-  // SYS_mmap2 has problems on Android API level <= 16.
-  // Workaround by invoking __mmap2() instead.
-  return __mmap2(start, length, prot, flags, fd, offset / pagesize);
-#else
-  return reinterpret_cast<void*>(
-      syscall(SYS_mmap2, start, length, prot, flags, fd,
-              static_cast<off_t>(offset / pagesize)));
-#endif
-#elif defined(__s390x__)
-  // On s390x, mmap() arguments are passed in memory.
-  unsigned long buf[6] = {reinterpret_cast<unsigned long>(start),  // NOLINT
-                          static_cast<unsigned long>(length),      // NOLINT
-                          static_cast<unsigned long>(prot),        // NOLINT
-                          static_cast<unsigned long>(flags),       // NOLINT
-                          static_cast<unsigned long>(fd),          // NOLINT
-                          static_cast<unsigned long>(offset)};     // NOLINT
-  return reinterpret_cast<void*>(syscall(SYS_mmap, buf));
-#elif defined(__x86_64__)
-// The x32 ABI has 32 bit longs, but the syscall interface is 64 bit.
-// We need to explicitly cast to an unsigned 64 bit type to avoid implicit
-// sign extension.  We can't cast pointers directly because those are
-// 32 bits, and gcc will dump ugly warnings about casting from a pointer
-// to an integer of a different size. We also need to make sure __off64_t
-// isn't truncated to 32-bits under x32.
-#define MMAP_SYSCALL_ARG(x) ((uint64_t)(uintptr_t)(x))
-  return reinterpret_cast<void*>(
-      syscall(SYS_mmap, MMAP_SYSCALL_ARG(start), MMAP_SYSCALL_ARG(length),
-              MMAP_SYSCALL_ARG(prot), MMAP_SYSCALL_ARG(flags),
-              MMAP_SYSCALL_ARG(fd), static_cast<uint64_t>(offset)));
-#undef MMAP_SYSCALL_ARG
-#else  // Remaining 64-bit aritectures.
-  static_assert(sizeof(unsigned long) == 8, "Platform is not 64-bit");
-  return reinterpret_cast<void*>(
-      syscall(SYS_mmap, start, length, prot, flags, fd, offset));
-#endif
-}
-
-inline int DirectMunmap(void* start, size_t length) {
-  return static_cast<int>(syscall(SYS_munmap, start, length));
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#else  // !__linux__
-
-// For non-linux platforms where we have mmap, just dispatch directly to the
-// actual mmap()/munmap() methods.
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-inline void* DirectMmap(void* start, size_t length, int prot, int flags, int fd,
-                        off_t offset) {
-  return mmap(start, length, prot, flags, fd, offset);
-}
-
-inline int DirectMunmap(void* start, size_t length) {
-  return munmap(start, length);
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // __linux__
-
-#endif  // ABSL_HAVE_MMAP
-
-#endif  // ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/dynamic_annotations.h b/third_party/abseil_cpp/absl/base/internal/dynamic_annotations.h
deleted file mode 100644
index b23c5ec1c41e..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/dynamic_annotations.h
+++ /dev/null
@@ -1,398 +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.
-
-// This file defines dynamic annotations for use with dynamic analysis tool
-// such as valgrind, PIN, etc.
-//
-// Dynamic annotation is a source code annotation that affects the generated
-// code (that is, the annotation is not a comment). Each such annotation is
-// attached to a particular instruction and/or to a particular object (address)
-// in the program.
-//
-// The annotations that should be used by users are macros in all upper-case
-// (e.g., ANNOTATE_THREAD_NAME).
-//
-// Actual implementation of these macros may differ depending on the dynamic
-// analysis tool being used.
-//
-// This file supports the following configurations:
-// - Dynamic Annotations enabled (with static thread-safety warnings disabled).
-//   In this case, macros expand to functions implemented by Thread Sanitizer,
-//   when building with TSan. When not provided an external implementation,
-//   dynamic_annotations.cc provides no-op implementations.
-//
-// - Static Clang thread-safety warnings enabled.
-//   When building with a Clang compiler that supports thread-safety warnings,
-//   a subset of annotations can be statically-checked at compile-time. We
-//   expand these macros to static-inline functions that can be analyzed for
-//   thread-safety, but afterwards elided when building the final binary.
-//
-// - All annotations are disabled.
-//   If neither Dynamic Annotations nor Clang thread-safety warnings are
-//   enabled, then all annotation-macros expand to empty.
-
-#ifndef ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
-#define ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
-
-#include <stddef.h>
-
-#include "absl/base/config.h"
-
-// -------------------------------------------------------------------------
-// Decide which features are enabled
-
-#ifndef DYNAMIC_ANNOTATIONS_ENABLED
-#define DYNAMIC_ANNOTATIONS_ENABLED 0
-#endif
-
-#if defined(__clang__) && !defined(SWIG)
-#define ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED 1
-#endif
-
-#if DYNAMIC_ANNOTATIONS_ENABLED != 0
-
-#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 1
-#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 1
-#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 1
-#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0
-#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED 1
-
-#else
-
-#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 0
-#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 0
-#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 0
-
-// Clang provides limited support for static thread-safety analysis through a
-// feature called Annotalysis. We configure macro-definitions according to
-// whether Annotalysis support is available. When running in opt-mode, GCC
-// will issue a warning, if these attributes are compiled. Only include them
-// when compiling using Clang.
-
-// ANNOTALYSIS_ENABLED == 1 when IGNORE_READ_ATTRIBUTE_ENABLED == 1
-#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED \
-  defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
-// Read/write annotations are enabled in Annotalysis mode; disabled otherwise.
-#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED \
-  ABSL_INTERNAL_ANNOTALYSIS_ENABLED
-#endif
-
-// Memory annotations are also made available to LLVM's Memory Sanitizer
-#if defined(ABSL_HAVE_MEMORY_SANITIZER) && !defined(__native_client__)
-#define ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED 1
-#endif
-
-#ifndef ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
-#define ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED 0
-#endif
-
-#ifdef __cplusplus
-#define ABSL_INTERNAL_BEGIN_EXTERN_C extern "C" {
-#define ABSL_INTERNAL_END_EXTERN_C }  // extern "C"
-#define ABSL_INTERNAL_GLOBAL_SCOPED(F) ::F
-#define ABSL_INTERNAL_STATIC_INLINE inline
-#else
-#define ABSL_INTERNAL_BEGIN_EXTERN_C  // empty
-#define ABSL_INTERNAL_END_EXTERN_C    // empty
-#define ABSL_INTERNAL_GLOBAL_SCOPED(F) F
-#define ABSL_INTERNAL_STATIC_INLINE static inline
-#endif
-
-// -------------------------------------------------------------------------
-// Define race annotations.
-
-#if ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 1
-
-// -------------------------------------------------------------
-// Annotations that suppress errors. It is usually better to express the
-// program's synchronization using the other annotations, but these can be used
-// when all else fails.
-
-// Report that we may have a benign race at `pointer`, with size
-// "sizeof(*(pointer))". `pointer` must be a non-void* pointer. Insert at the
-// point where `pointer` has been allocated, preferably close to the point
-// where the race happens. See also ANNOTATE_BENIGN_RACE_STATIC.
-#define ANNOTATE_BENIGN_RACE(pointer, description)     \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
-  (__FILE__, __LINE__, pointer, sizeof(*(pointer)), description)
-
-// Same as ANNOTATE_BENIGN_RACE(`address`, `description`), but applies to
-// the memory range [`address`, `address`+`size`).
-#define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized)         \
-  (__FILE__, __LINE__, address, size, description)
-
-// Enable (`enable`!=0) or disable (`enable`==0) race detection for all threads.
-// This annotation could be useful if you want to skip expensive race analysis
-// during some period of program execution, e.g. during initialization.
-#define ANNOTATE_ENABLE_RACE_DETECTION(enable)             \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateEnableRaceDetection) \
-  (__FILE__, __LINE__, enable)
-
-// -------------------------------------------------------------
-// Annotations useful for debugging.
-
-// Report the current thread `name` to a race detector.
-#define ANNOTATE_THREAD_NAME(name) \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateThreadName)(__FILE__, __LINE__, name)
-
-// -------------------------------------------------------------
-// Annotations useful when implementing locks. They are not normally needed by
-// modules that merely use locks. The `lock` argument is a pointer to the lock
-// object.
-
-// Report that a lock has been created at address `lock`.
-#define ANNOTATE_RWLOCK_CREATE(lock) \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreate)(__FILE__, __LINE__, lock)
-
-// Report that a linker initialized lock has been created at address `lock`.
-#ifdef ABSL_HAVE_THREAD_SANITIZER
-#define ANNOTATE_RWLOCK_CREATE_STATIC(lock)               \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreateStatic) \
-  (__FILE__, __LINE__, lock)
-#else
-#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) ANNOTATE_RWLOCK_CREATE(lock)
-#endif
-
-// Report that the lock at address `lock` is about to be destroyed.
-#define ANNOTATE_RWLOCK_DESTROY(lock) \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockDestroy)(__FILE__, __LINE__, lock)
-
-// Report that the lock at address `lock` has been acquired.
-// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
-#define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w)          \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockAcquired) \
-  (__FILE__, __LINE__, lock, is_w)
-
-// Report that the lock at address `lock` is about to be released.
-// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
-#define ANNOTATE_RWLOCK_RELEASED(lock, is_w)          \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockReleased) \
-  (__FILE__, __LINE__, lock, is_w)
-
-// Apply ANNOTATE_BENIGN_RACE_SIZED to a static variable `static_var`.
-#define ANNOTATE_BENIGN_RACE_STATIC(static_var, description)      \
-  namespace {                                                     \
-  class static_var##_annotator {                                  \
-   public:                                                        \
-    static_var##_annotator() {                                    \
-      ANNOTATE_BENIGN_RACE_SIZED(&static_var, sizeof(static_var), \
-                                 #static_var ": " description);   \
-    }                                                             \
-  };                                                              \
-  static static_var##_annotator the##static_var##_annotator;      \
-  }  // namespace
-
-#else  // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 0
-
-#define ANNOTATE_RWLOCK_CREATE(lock)                            // empty
-#define ANNOTATE_RWLOCK_CREATE_STATIC(lock)                     // empty
-#define ANNOTATE_RWLOCK_DESTROY(lock)                           // empty
-#define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w)                    // empty
-#define ANNOTATE_RWLOCK_RELEASED(lock, is_w)                    // empty
-#define ANNOTATE_BENIGN_RACE(address, description)              // empty
-#define ANNOTATE_BENIGN_RACE_SIZED(address, size, description)  // empty
-#define ANNOTATE_THREAD_NAME(name)                              // empty
-#define ANNOTATE_ENABLE_RACE_DETECTION(enable)                  // empty
-#define ANNOTATE_BENIGN_RACE_STATIC(static_var, description)    // empty
-
-#endif  // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
-
-// -------------------------------------------------------------------------
-// Define memory annotations.
-
-#if ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED == 1
-
-#include <sanitizer/msan_interface.h>
-
-#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
-  __msan_unpoison(address, size)
-
-#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
-  __msan_allocated_memory(address, size)
-
-#else  // ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED == 0
-
-#if DYNAMIC_ANNOTATIONS_ENABLED == 1
-#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
-  do {                                                \
-    (void)(address);                                  \
-    (void)(size);                                     \
-  } while (0)
-#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
-  do {                                                  \
-    (void)(address);                                    \
-    (void)(size);                                       \
-  } while (0)
-#else
-#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size)    // empty
-#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size)  // empty
-#endif
-
-#endif  // ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
-
-// -------------------------------------------------------------------------
-// Define IGNORE_READS_BEGIN/_END attributes.
-
-#if defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
-
-#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE \
-  __attribute((exclusive_lock_function("*")))
-#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE \
-  __attribute((unlock_function("*")))
-
-#else  // !defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
-
-#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE  // empty
-#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE    // empty
-
-#endif  // defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
-
-// -------------------------------------------------------------------------
-// Define IGNORE_READS_BEGIN/_END annotations.
-
-#if ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED == 1
-
-// Request the analysis tool to ignore all reads in the current thread until
-// ANNOTATE_IGNORE_READS_END is called. Useful to ignore intentional racey
-// reads, while still checking other reads and all writes.
-// See also ANNOTATE_UNPROTECTED_READ.
-#define ANNOTATE_IGNORE_READS_BEGIN() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin)(__FILE__, __LINE__)
-
-// Stop ignoring reads.
-#define ANNOTATE_IGNORE_READS_END() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd)(__FILE__, __LINE__)
-
-#elif defined(ABSL_INTERNAL_ANNOTALYSIS_ENABLED)
-
-// When Annotalysis is enabled without Dynamic Annotations, the use of
-// static-inline functions allows the annotations to be read at compile-time,
-// while still letting the compiler elide the functions from the final build.
-//
-// TODO(delesley) -- The exclusive lock here ignores writes as well, but
-// allows IGNORE_READS_AND_WRITES to work properly.
-
-#define ANNOTATE_IGNORE_READS_BEGIN() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsBegin)()
-
-#define ANNOTATE_IGNORE_READS_END() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsEnd)()
-
-#else
-
-#define ANNOTATE_IGNORE_READS_BEGIN()  // empty
-#define ANNOTATE_IGNORE_READS_END()    // empty
-
-#endif
-
-// -------------------------------------------------------------------------
-// Define IGNORE_WRITES_BEGIN/_END annotations.
-
-#if ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED == 1
-
-// Similar to ANNOTATE_IGNORE_READS_BEGIN, but ignore writes instead.
-#define ANNOTATE_IGNORE_WRITES_BEGIN() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesBegin)(__FILE__, __LINE__)
-
-// Stop ignoring writes.
-#define ANNOTATE_IGNORE_WRITES_END() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesEnd)(__FILE__, __LINE__)
-
-#else
-
-#define ANNOTATE_IGNORE_WRITES_BEGIN()  // empty
-#define ANNOTATE_IGNORE_WRITES_END()    // empty
-
-#endif
-
-// -------------------------------------------------------------------------
-// Define the ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more
-// primitive annotations defined above.
-//
-//     Instead of doing
-//        ANNOTATE_IGNORE_READS_BEGIN();
-//        ... = x;
-//        ANNOTATE_IGNORE_READS_END();
-//     one can use
-//        ... = ANNOTATE_UNPROTECTED_READ(x);
-
-#if defined(ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED)
-
-// Start ignoring all memory accesses (both reads and writes).
-#define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \
-  do {                                           \
-    ANNOTATE_IGNORE_READS_BEGIN();               \
-    ANNOTATE_IGNORE_WRITES_BEGIN();              \
-  } while (0)
-
-// Stop ignoring both reads and writes.
-#define ANNOTATE_IGNORE_READS_AND_WRITES_END() \
-  do {                                         \
-    ANNOTATE_IGNORE_WRITES_END();              \
-    ANNOTATE_IGNORE_READS_END();               \
-  } while (0)
-
-#ifdef __cplusplus
-// ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads.
-#define ANNOTATE_UNPROTECTED_READ(x) \
-  absl::base_internal::AnnotateUnprotectedRead(x)
-
-#endif
-
-#else
-
-#define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN()  // empty
-#define ANNOTATE_IGNORE_READS_AND_WRITES_END()    // empty
-#define ANNOTATE_UNPROTECTED_READ(x) (x)
-
-#endif
-
-// -------------------------------------------------------------------------
-// Address sanitizer annotations
-
-#ifdef ABSL_HAVE_ADDRESS_SANITIZER
-// Describe the current state of a contiguous container such as e.g.
-// std::vector or std::string. For more details see
-// sanitizer/common_interface_defs.h, which is provided by the compiler.
-#include <sanitizer/common_interface_defs.h>
-
-#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) \
-  __sanitizer_annotate_contiguous_container(beg, end, old_mid, new_mid)
-#define ADDRESS_SANITIZER_REDZONE(name)    \
-  struct {                                 \
-    char x[8] __attribute__((aligned(8))); \
-  } name
-
-#else
-
-#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid)
-#define ADDRESS_SANITIZER_REDZONE(name) static_assert(true, "")
-
-#endif  // ABSL_HAVE_ADDRESS_SANITIZER
-
-// -------------------------------------------------------------------------
-// Undefine the macros intended only for this file.
-
-#undef ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
-#undef ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
-#undef ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED
-#undef ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED
-#undef ABSL_INTERNAL_ANNOTALYSIS_ENABLED
-#undef ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED
-#undef ABSL_INTERNAL_BEGIN_EXTERN_C
-#undef ABSL_INTERNAL_END_EXTERN_C
-#undef ABSL_INTERNAL_STATIC_INLINE
-
-#endif  // ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/endian.h b/third_party/abseil_cpp/absl/base/internal/endian.h
deleted file mode 100644
index 9677530e8de3..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/endian.h
+++ /dev/null
@@ -1,266 +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_BASE_INTERNAL_ENDIAN_H_
-#define ABSL_BASE_INTERNAL_ENDIAN_H_
-
-// The following guarantees declaration of the byte swap functions
-#ifdef _MSC_VER
-#include <stdlib.h>  // NOLINT(build/include)
-#elif defined(__FreeBSD__)
-#include <sys/endian.h>
-#elif defined(__GLIBC__)
-#include <byteswap.h>  // IWYU pragma: export
-#endif
-
-#include <cstdint>
-#include "absl/base/config.h"
-#include "absl/base/internal/unaligned_access.h"
-#include "absl/base/port.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-// Use compiler byte-swapping intrinsics if they are available.  32-bit
-// and 64-bit versions are available in Clang and GCC as of GCC 4.3.0.
-// The 16-bit version is available in Clang and GCC only as of GCC 4.8.0.
-// For simplicity, we enable them all only for GCC 4.8.0 or later.
-#if defined(__clang__) || \
-    (defined(__GNUC__) && \
-     ((__GNUC__ == 4 && __GNUC_MINOR__ >= 8) || __GNUC__ >= 5))
-inline uint64_t gbswap_64(uint64_t host_int) {
-  return __builtin_bswap64(host_int);
-}
-inline uint32_t gbswap_32(uint32_t host_int) {
-  return __builtin_bswap32(host_int);
-}
-inline uint16_t gbswap_16(uint16_t host_int) {
-  return __builtin_bswap16(host_int);
-}
-
-#elif defined(_MSC_VER)
-inline uint64_t gbswap_64(uint64_t host_int) {
-  return _byteswap_uint64(host_int);
-}
-inline uint32_t gbswap_32(uint32_t host_int) {
-  return _byteswap_ulong(host_int);
-}
-inline uint16_t gbswap_16(uint16_t host_int) {
-  return _byteswap_ushort(host_int);
-}
-
-#else
-inline uint64_t gbswap_64(uint64_t host_int) {
-#if defined(__GNUC__) && defined(__x86_64__) && !defined(__APPLE__)
-  // Adapted from /usr/include/byteswap.h.  Not available on Mac.
-  if (__builtin_constant_p(host_int)) {
-    return __bswap_constant_64(host_int);
-  } else {
-    uint64_t result;
-    __asm__("bswap %0" : "=r"(result) : "0"(host_int));
-    return result;
-  }
-#elif defined(__GLIBC__)
-  return bswap_64(host_int);
-#else
-  return (((host_int & uint64_t{0xFF}) << 56) |
-          ((host_int & uint64_t{0xFF00}) << 40) |
-          ((host_int & uint64_t{0xFF0000}) << 24) |
-          ((host_int & uint64_t{0xFF000000}) << 8) |
-          ((host_int & uint64_t{0xFF00000000}) >> 8) |
-          ((host_int & uint64_t{0xFF0000000000}) >> 24) |
-          ((host_int & uint64_t{0xFF000000000000}) >> 40) |
-          ((host_int & uint64_t{0xFF00000000000000}) >> 56));
-#endif  // bswap_64
-}
-
-inline uint32_t gbswap_32(uint32_t host_int) {
-#if defined(__GLIBC__)
-  return bswap_32(host_int);
-#else
-  return (((host_int & uint32_t{0xFF}) << 24) |
-          ((host_int & uint32_t{0xFF00}) << 8) |
-          ((host_int & uint32_t{0xFF0000}) >> 8) |
-          ((host_int & uint32_t{0xFF000000}) >> 24));
-#endif
-}
-
-inline uint16_t gbswap_16(uint16_t host_int) {
-#if defined(__GLIBC__)
-  return bswap_16(host_int);
-#else
-  return (((host_int & uint16_t{0xFF}) << 8) |
-          ((host_int & uint16_t{0xFF00}) >> 8));
-#endif
-}
-
-#endif  // intrinsics available
-
-#ifdef ABSL_IS_LITTLE_ENDIAN
-
-// Definitions for ntohl etc. that don't require us to include
-// netinet/in.h. We wrap gbswap_32 and gbswap_16 in functions rather
-// than just #defining them because in debug mode, gcc doesn't
-// correctly handle the (rather involved) definitions of bswap_32.
-// gcc guarantees that inline functions are as fast as macros, so
-// this isn't a performance hit.
-inline uint16_t ghtons(uint16_t x) { return gbswap_16(x); }
-inline uint32_t ghtonl(uint32_t x) { return gbswap_32(x); }
-inline uint64_t ghtonll(uint64_t x) { return gbswap_64(x); }
-
-#elif defined ABSL_IS_BIG_ENDIAN
-
-// These definitions are simpler on big-endian machines
-// These are functions instead of macros to avoid self-assignment warnings
-// on calls such as "i = ghtnol(i);".  This also provides type checking.
-inline uint16_t ghtons(uint16_t x) { return x; }
-inline uint32_t ghtonl(uint32_t x) { return x; }
-inline uint64_t ghtonll(uint64_t x) { return x; }
-
-#else
-#error \
-    "Unsupported byte order: Either ABSL_IS_BIG_ENDIAN or " \
-       "ABSL_IS_LITTLE_ENDIAN must be defined"
-#endif  // byte order
-
-inline uint16_t gntohs(uint16_t x) { return ghtons(x); }
-inline uint32_t gntohl(uint32_t x) { return ghtonl(x); }
-inline uint64_t gntohll(uint64_t x) { return ghtonll(x); }
-
-// Utilities to convert numbers between the current hosts's native byte
-// order and little-endian byte order
-//
-// Load/Store methods are alignment safe
-namespace little_endian {
-// Conversion functions.
-#ifdef ABSL_IS_LITTLE_ENDIAN
-
-inline uint16_t FromHost16(uint16_t x) { return x; }
-inline uint16_t ToHost16(uint16_t x) { return x; }
-
-inline uint32_t FromHost32(uint32_t x) { return x; }
-inline uint32_t ToHost32(uint32_t x) { return x; }
-
-inline uint64_t FromHost64(uint64_t x) { return x; }
-inline uint64_t ToHost64(uint64_t x) { return x; }
-
-inline constexpr bool IsLittleEndian() { return true; }
-
-#elif defined ABSL_IS_BIG_ENDIAN
-
-inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
-inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
-
-inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
-inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
-
-inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
-inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
-
-inline constexpr bool IsLittleEndian() { return false; }
-
-#endif /* ENDIAN */
-
-// Functions to do unaligned loads and stores in little-endian order.
-inline uint16_t Load16(const void *p) {
-  return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
-}
-
-inline void Store16(void *p, uint16_t v) {
-  ABSL_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
-}
-
-inline uint32_t Load32(const void *p) {
-  return ToHost32(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
-}
-
-inline void Store32(void *p, uint32_t v) {
-  ABSL_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
-}
-
-inline uint64_t Load64(const void *p) {
-  return ToHost64(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
-}
-
-inline void Store64(void *p, uint64_t v) {
-  ABSL_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
-}
-
-}  // namespace little_endian
-
-// Utilities to convert numbers between the current hosts's native byte
-// order and big-endian byte order (same as network byte order)
-//
-// Load/Store methods are alignment safe
-namespace big_endian {
-#ifdef ABSL_IS_LITTLE_ENDIAN
-
-inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
-inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
-
-inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
-inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
-
-inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
-inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
-
-inline constexpr bool IsLittleEndian() { return true; }
-
-#elif defined ABSL_IS_BIG_ENDIAN
-
-inline uint16_t FromHost16(uint16_t x) { return x; }
-inline uint16_t ToHost16(uint16_t x) { return x; }
-
-inline uint32_t FromHost32(uint32_t x) { return x; }
-inline uint32_t ToHost32(uint32_t x) { return x; }
-
-inline uint64_t FromHost64(uint64_t x) { return x; }
-inline uint64_t ToHost64(uint64_t x) { return x; }
-
-inline constexpr bool IsLittleEndian() { return false; }
-
-#endif /* ENDIAN */
-
-// Functions to do unaligned loads and stores in big-endian order.
-inline uint16_t Load16(const void *p) {
-  return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
-}
-
-inline void Store16(void *p, uint16_t v) {
-  ABSL_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
-}
-
-inline uint32_t Load32(const void *p) {
-  return ToHost32(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
-}
-
-inline void Store32(void *p, uint32_t v) {
-  ABSL_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
-}
-
-inline uint64_t Load64(const void *p) {
-  return ToHost64(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
-}
-
-inline void Store64(void *p, uint64_t v) {
-  ABSL_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
-}
-
-}  // namespace big_endian
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_ENDIAN_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/endian_test.cc b/third_party/abseil_cpp/absl/base/internal/endian_test.cc
deleted file mode 100644
index a1691b1f82c0..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/endian_test.cc
+++ /dev/null
@@ -1,263 +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/base/internal/endian.h"
-
-#include <algorithm>
-#include <cstdint>
-#include <limits>
-#include <random>
-#include <vector>
-
-#include "gtest/gtest.h"
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace {
-
-const uint64_t kInitialNumber{0x0123456789abcdef};
-const uint64_t k64Value{kInitialNumber};
-const uint32_t k32Value{0x01234567};
-const uint16_t k16Value{0x0123};
-const int kNumValuesToTest = 1000000;
-const int kRandomSeed = 12345;
-
-#if defined(ABSL_IS_BIG_ENDIAN)
-const uint64_t kInitialInNetworkOrder{kInitialNumber};
-const uint64_t k64ValueLE{0xefcdab8967452301};
-const uint32_t k32ValueLE{0x67452301};
-const uint16_t k16ValueLE{0x2301};
-
-const uint64_t k64ValueBE{kInitialNumber};
-const uint32_t k32ValueBE{k32Value};
-const uint16_t k16ValueBE{k16Value};
-#elif defined(ABSL_IS_LITTLE_ENDIAN)
-const uint64_t kInitialInNetworkOrder{0xefcdab8967452301};
-const uint64_t k64ValueLE{kInitialNumber};
-const uint32_t k32ValueLE{k32Value};
-const uint16_t k16ValueLE{k16Value};
-
-const uint64_t k64ValueBE{0xefcdab8967452301};
-const uint32_t k32ValueBE{0x67452301};
-const uint16_t k16ValueBE{0x2301};
-#endif
-
-std::vector<uint16_t> GenerateAllUint16Values() {
-  std::vector<uint16_t> result;
-  result.reserve(size_t{1} << (sizeof(uint16_t) * 8));
-  for (uint32_t i = std::numeric_limits<uint16_t>::min();
-       i <= std::numeric_limits<uint16_t>::max(); ++i) {
-    result.push_back(static_cast<uint16_t>(i));
-  }
-  return result;
-}
-
-template<typename T>
-std::vector<T> GenerateRandomIntegers(size_t num_values_to_test) {
-  std::vector<T> result;
-  result.reserve(num_values_to_test);
-  std::mt19937_64 rng(kRandomSeed);
-  for (size_t i = 0; i < num_values_to_test; ++i) {
-    result.push_back(rng());
-  }
-  return result;
-}
-
-void ManualByteSwap(char* bytes, int length) {
-  if (length == 1)
-    return;
-
-  EXPECT_EQ(0, length % 2);
-  for (int i = 0; i < length / 2; ++i) {
-    int j = (length - 1) - i;
-    using std::swap;
-    swap(bytes[i], bytes[j]);
-  }
-}
-
-template<typename T>
-inline T UnalignedLoad(const char* p) {
-  static_assert(
-      sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8,
-      "Unexpected type size");
-
-  switch (sizeof(T)) {
-    case 1: return *reinterpret_cast<const T*>(p);
-    case 2:
-      return ABSL_INTERNAL_UNALIGNED_LOAD16(p);
-    case 4:
-      return ABSL_INTERNAL_UNALIGNED_LOAD32(p);
-    case 8:
-      return ABSL_INTERNAL_UNALIGNED_LOAD64(p);
-    default:
-      // Suppresses invalid "not all control paths return a value" on MSVC
-      return {};
-  }
-}
-
-template <typename T, typename ByteSwapper>
-static void GBSwapHelper(const std::vector<T>& host_values_to_test,
-                         const ByteSwapper& byte_swapper) {
-  // Test byte_swapper against a manual byte swap.
-  for (typename std::vector<T>::const_iterator it = host_values_to_test.begin();
-       it != host_values_to_test.end(); ++it) {
-    T host_value = *it;
-
-    char actual_value[sizeof(host_value)];
-    memcpy(actual_value, &host_value, sizeof(host_value));
-    byte_swapper(actual_value);
-
-    char expected_value[sizeof(host_value)];
-    memcpy(expected_value, &host_value, sizeof(host_value));
-    ManualByteSwap(expected_value, sizeof(host_value));
-
-    ASSERT_EQ(0, memcmp(actual_value, expected_value, sizeof(host_value)))
-        << "Swap output for 0x" << std::hex << host_value << " does not match. "
-        << "Expected: 0x" << UnalignedLoad<T>(expected_value) << "; "
-        << "actual: 0x" <<  UnalignedLoad<T>(actual_value);
-  }
-}
-
-void Swap16(char* bytes) {
-  ABSL_INTERNAL_UNALIGNED_STORE16(
-      bytes, gbswap_16(ABSL_INTERNAL_UNALIGNED_LOAD16(bytes)));
-}
-
-void Swap32(char* bytes) {
-  ABSL_INTERNAL_UNALIGNED_STORE32(
-      bytes, gbswap_32(ABSL_INTERNAL_UNALIGNED_LOAD32(bytes)));
-}
-
-void Swap64(char* bytes) {
-  ABSL_INTERNAL_UNALIGNED_STORE64(
-      bytes, gbswap_64(ABSL_INTERNAL_UNALIGNED_LOAD64(bytes)));
-}
-
-TEST(EndianessTest, Uint16) {
-  GBSwapHelper(GenerateAllUint16Values(), &Swap16);
-}
-
-TEST(EndianessTest, Uint32) {
-  GBSwapHelper(GenerateRandomIntegers<uint32_t>(kNumValuesToTest), &Swap32);
-}
-
-TEST(EndianessTest, Uint64) {
-  GBSwapHelper(GenerateRandomIntegers<uint64_t>(kNumValuesToTest), &Swap64);
-}
-
-TEST(EndianessTest, ghtonll_gntohll) {
-  // Test that absl::ghtonl compiles correctly
-  uint32_t test = 0x01234567;
-  EXPECT_EQ(absl::gntohl(absl::ghtonl(test)), test);
-
-  uint64_t comp = absl::ghtonll(kInitialNumber);
-  EXPECT_EQ(comp, kInitialInNetworkOrder);
-  comp = absl::gntohll(kInitialInNetworkOrder);
-  EXPECT_EQ(comp, kInitialNumber);
-
-  // Test that htonll and ntohll are each others' inverse functions on a
-  // somewhat assorted batch of numbers. 37 is chosen to not be anything
-  // particularly nice base 2.
-  uint64_t value = 1;
-  for (int i = 0; i < 100; ++i) {
-    comp = absl::ghtonll(absl::gntohll(value));
-    EXPECT_EQ(value, comp);
-    comp = absl::gntohll(absl::ghtonll(value));
-    EXPECT_EQ(value, comp);
-    value *= 37;
-  }
-}
-
-TEST(EndianessTest, little_endian) {
-  // Check little_endian uint16_t.
-  uint64_t comp = little_endian::FromHost16(k16Value);
-  EXPECT_EQ(comp, k16ValueLE);
-  comp = little_endian::ToHost16(k16ValueLE);
-  EXPECT_EQ(comp, k16Value);
-
-  // Check little_endian uint32_t.
-  comp = little_endian::FromHost32(k32Value);
-  EXPECT_EQ(comp, k32ValueLE);
-  comp = little_endian::ToHost32(k32ValueLE);
-  EXPECT_EQ(comp, k32Value);
-
-  // Check little_endian uint64_t.
-  comp = little_endian::FromHost64(k64Value);
-  EXPECT_EQ(comp, k64ValueLE);
-  comp = little_endian::ToHost64(k64ValueLE);
-  EXPECT_EQ(comp, k64Value);
-
-  // Check little-endian Load and store functions.
-  uint16_t u16Buf;
-  uint32_t u32Buf;
-  uint64_t u64Buf;
-
-  little_endian::Store16(&u16Buf, k16Value);
-  EXPECT_EQ(u16Buf, k16ValueLE);
-  comp = little_endian::Load16(&u16Buf);
-  EXPECT_EQ(comp, k16Value);
-
-  little_endian::Store32(&u32Buf, k32Value);
-  EXPECT_EQ(u32Buf, k32ValueLE);
-  comp = little_endian::Load32(&u32Buf);
-  EXPECT_EQ(comp, k32Value);
-
-  little_endian::Store64(&u64Buf, k64Value);
-  EXPECT_EQ(u64Buf, k64ValueLE);
-  comp = little_endian::Load64(&u64Buf);
-  EXPECT_EQ(comp, k64Value);
-}
-
-TEST(EndianessTest, big_endian) {
-  // Check big-endian Load and store functions.
-  uint16_t u16Buf;
-  uint32_t u32Buf;
-  uint64_t u64Buf;
-
-  unsigned char buffer[10];
-  big_endian::Store16(&u16Buf, k16Value);
-  EXPECT_EQ(u16Buf, k16ValueBE);
-  uint64_t comp = big_endian::Load16(&u16Buf);
-  EXPECT_EQ(comp, k16Value);
-
-  big_endian::Store32(&u32Buf, k32Value);
-  EXPECT_EQ(u32Buf, k32ValueBE);
-  comp = big_endian::Load32(&u32Buf);
-  EXPECT_EQ(comp, k32Value);
-
-  big_endian::Store64(&u64Buf, k64Value);
-  EXPECT_EQ(u64Buf, k64ValueBE);
-  comp = big_endian::Load64(&u64Buf);
-  EXPECT_EQ(comp, k64Value);
-
-  big_endian::Store16(buffer + 1, k16Value);
-  EXPECT_EQ(u16Buf, k16ValueBE);
-  comp = big_endian::Load16(buffer + 1);
-  EXPECT_EQ(comp, k16Value);
-
-  big_endian::Store32(buffer + 1, k32Value);
-  EXPECT_EQ(u32Buf, k32ValueBE);
-  comp = big_endian::Load32(buffer + 1);
-  EXPECT_EQ(comp, k32Value);
-
-  big_endian::Store64(buffer + 1, k64Value);
-  EXPECT_EQ(u64Buf, k64ValueBE);
-  comp = big_endian::Load64(buffer + 1);
-  EXPECT_EQ(comp, k64Value);
-}
-
-}  // namespace
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/errno_saver.h b/third_party/abseil_cpp/absl/base/internal/errno_saver.h
deleted file mode 100644
index 251de510fc93..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/errno_saver.h
+++ /dev/null
@@ -1,43 +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_BASE_INTERNAL_ERRNO_SAVER_H_
-#define ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
-
-#include <cerrno>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// `ErrnoSaver` captures the value of `errno` upon construction and restores it
-// upon deletion.  It is used in low-level code and must be super fast.  Do not
-// add instrumentation, even in debug modes.
-class ErrnoSaver {
- public:
-  ErrnoSaver() : saved_errno_(errno) {}
-  ~ErrnoSaver() { errno = saved_errno_; }
-  int operator()() const { return saved_errno_; }
-
- private:
-  const int saved_errno_;
-};
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/errno_saver_test.cc b/third_party/abseil_cpp/absl/base/internal/errno_saver_test.cc
deleted file mode 100644
index e9b742c588b0..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/errno_saver_test.cc
+++ /dev/null
@@ -1,45 +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/base/internal/errno_saver.h"
-
-#include <cerrno>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/base/internal/strerror.h"
-
-namespace {
-using ::testing::Eq;
-
-struct ErrnoPrinter {
-  int no;
-};
-std::ostream &operator<<(std::ostream &os, ErrnoPrinter ep) {
-  return os << absl::base_internal::StrError(ep.no) << " [" << ep.no << "]";
-}
-bool operator==(ErrnoPrinter one, ErrnoPrinter two) { return one.no == two.no; }
-
-TEST(ErrnoSaverTest, Works) {
-  errno = EDOM;
-  {
-    absl::base_internal::ErrnoSaver errno_saver;
-    EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
-    errno = ERANGE;
-    EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{ERANGE}));
-    EXPECT_THAT(ErrnoPrinter{errno_saver()}, Eq(ErrnoPrinter{EDOM}));
-  }
-  EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
-}
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/exception_safety_testing.cc b/third_party/abseil_cpp/absl/base/internal/exception_safety_testing.cc
deleted file mode 100644
index 6ccac41864b1..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/exception_safety_testing.cc
+++ /dev/null
@@ -1,79 +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/base/internal/exception_safety_testing.h"
-
-#ifdef ABSL_HAVE_EXCEPTIONS
-
-#include "gtest/gtest.h"
-#include "absl/meta/type_traits.h"
-
-namespace testing {
-
-exceptions_internal::NoThrowTag nothrow_ctor;
-
-exceptions_internal::StrongGuaranteeTagType strong_guarantee;
-
-exceptions_internal::ExceptionSafetyTestBuilder<> MakeExceptionSafetyTester() {
-  return {};
-}
-
-namespace exceptions_internal {
-
-int countdown = -1;
-
-ConstructorTracker* ConstructorTracker::current_tracker_instance_ = nullptr;
-
-void MaybeThrow(absl::string_view msg, bool throw_bad_alloc) {
-  if (countdown-- == 0) {
-    if (throw_bad_alloc) throw TestBadAllocException(msg);
-    throw TestException(msg);
-  }
-}
-
-testing::AssertionResult FailureMessage(const TestException& e,
-                                        int countdown) noexcept {
-  return testing::AssertionFailure() << "Exception thrown from " << e.what();
-}
-
-std::string GetSpecString(TypeSpec spec) {
-  std::string out;
-  absl::string_view sep;
-  const auto append = [&](absl::string_view s) {
-    absl::StrAppend(&out, sep, s);
-    sep = " | ";
-  };
-  if (static_cast<bool>(TypeSpec::kNoThrowCopy & spec)) {
-    append("kNoThrowCopy");
-  }
-  if (static_cast<bool>(TypeSpec::kNoThrowMove & spec)) {
-    append("kNoThrowMove");
-  }
-  if (static_cast<bool>(TypeSpec::kNoThrowNew & spec)) {
-    append("kNoThrowNew");
-  }
-  return out;
-}
-
-std::string GetSpecString(AllocSpec spec) {
-  return static_cast<bool>(AllocSpec::kNoThrowAllocate & spec)
-             ? "kNoThrowAllocate"
-             : "";
-}
-
-}  // namespace exceptions_internal
-
-}  // namespace testing
-
-#endif  // ABSL_HAVE_EXCEPTIONS
diff --git a/third_party/abseil_cpp/absl/base/internal/exception_safety_testing.h b/third_party/abseil_cpp/absl/base/internal/exception_safety_testing.h
deleted file mode 100644
index 6ba89d05dfca..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/exception_safety_testing.h
+++ /dev/null
@@ -1,1101 +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.
-
-// Utilities for testing exception-safety
-
-#ifndef ABSL_BASE_INTERNAL_EXCEPTION_SAFETY_TESTING_H_
-#define ABSL_BASE_INTERNAL_EXCEPTION_SAFETY_TESTING_H_
-
-#include "absl/base/config.h"
-
-#ifdef ABSL_HAVE_EXCEPTIONS
-
-#include <cstddef>
-#include <cstdint>
-#include <functional>
-#include <initializer_list>
-#include <iosfwd>
-#include <string>
-#include <tuple>
-#include <unordered_map>
-
-#include "gtest/gtest.h"
-#include "absl/base/internal/pretty_function.h"
-#include "absl/memory/memory.h"
-#include "absl/meta/type_traits.h"
-#include "absl/strings/string_view.h"
-#include "absl/strings/substitute.h"
-#include "absl/utility/utility.h"
-
-namespace testing {
-
-enum class TypeSpec;
-enum class AllocSpec;
-
-constexpr TypeSpec operator|(TypeSpec a, TypeSpec b) {
-  using T = absl::underlying_type_t<TypeSpec>;
-  return static_cast<TypeSpec>(static_cast<T>(a) | static_cast<T>(b));
-}
-
-constexpr TypeSpec operator&(TypeSpec a, TypeSpec b) {
-  using T = absl::underlying_type_t<TypeSpec>;
-  return static_cast<TypeSpec>(static_cast<T>(a) & static_cast<T>(b));
-}
-
-constexpr AllocSpec operator|(AllocSpec a, AllocSpec b) {
-  using T = absl::underlying_type_t<AllocSpec>;
-  return static_cast<AllocSpec>(static_cast<T>(a) | static_cast<T>(b));
-}
-
-constexpr AllocSpec operator&(AllocSpec a, AllocSpec b) {
-  using T = absl::underlying_type_t<AllocSpec>;
-  return static_cast<AllocSpec>(static_cast<T>(a) & static_cast<T>(b));
-}
-
-namespace exceptions_internal {
-
-std::string GetSpecString(TypeSpec);
-std::string GetSpecString(AllocSpec);
-
-struct NoThrowTag {};
-struct StrongGuaranteeTagType {};
-
-// A simple exception class.  We throw this so that test code can catch
-// exceptions specifically thrown by ThrowingValue.
-class TestException {
- public:
-  explicit TestException(absl::string_view msg) : msg_(msg) {}
-  virtual ~TestException() {}
-  virtual const char* what() const noexcept { return msg_.c_str(); }
-
- private:
-  std::string msg_;
-};
-
-// TestBadAllocException exists because allocation functions must throw an
-// exception which can be caught by a handler of std::bad_alloc.  We use a child
-// class of std::bad_alloc so we can customise the error message, and also
-// derive from TestException so we don't accidentally end up catching an actual
-// bad_alloc exception in TestExceptionSafety.
-class TestBadAllocException : public std::bad_alloc, public TestException {
- public:
-  explicit TestBadAllocException(absl::string_view msg) : TestException(msg) {}
-  using TestException::what;
-};
-
-extern int countdown;
-
-// Allows the countdown variable to be set manually (defaulting to the initial
-// value of 0)
-inline void SetCountdown(int i = 0) { countdown = i; }
-// Sets the countdown to the terminal value -1
-inline void UnsetCountdown() { SetCountdown(-1); }
-
-void MaybeThrow(absl::string_view msg, bool throw_bad_alloc = false);
-
-testing::AssertionResult FailureMessage(const TestException& e,
-                                        int countdown) noexcept;
-
-struct TrackedAddress {
-  bool is_alive;
-  std::string description;
-};
-
-// Inspects the constructions and destructions of anything inheriting from
-// TrackedObject. This allows us to safely "leak" TrackedObjects, as
-// ConstructorTracker will destroy everything left over in its destructor.
-class ConstructorTracker {
- public:
-  explicit ConstructorTracker(int count) : countdown_(count) {
-    assert(current_tracker_instance_ == nullptr);
-    current_tracker_instance_ = this;
-  }
-
-  ~ConstructorTracker() {
-    assert(current_tracker_instance_ == this);
-    current_tracker_instance_ = nullptr;
-
-    for (auto& it : address_map_) {
-      void* address = it.first;
-      TrackedAddress& tracked_address = it.second;
-      if (tracked_address.is_alive) {
-        ADD_FAILURE() << ErrorMessage(address, tracked_address.description,
-                                      countdown_, "Object was not destroyed.");
-      }
-    }
-  }
-
-  static void ObjectConstructed(void* address, std::string description) {
-    if (!CurrentlyTracking()) return;
-
-    TrackedAddress& tracked_address =
-        current_tracker_instance_->address_map_[address];
-    if (tracked_address.is_alive) {
-      ADD_FAILURE() << ErrorMessage(
-          address, tracked_address.description,
-          current_tracker_instance_->countdown_,
-          "Object was re-constructed. Current object was constructed by " +
-              description);
-    }
-    tracked_address = {true, std::move(description)};
-  }
-
-  static void ObjectDestructed(void* address) {
-    if (!CurrentlyTracking()) return;
-
-    auto it = current_tracker_instance_->address_map_.find(address);
-    // Not tracked. Ignore.
-    if (it == current_tracker_instance_->address_map_.end()) return;
-
-    TrackedAddress& tracked_address = it->second;
-    if (!tracked_address.is_alive) {
-      ADD_FAILURE() << ErrorMessage(address, tracked_address.description,
-                                    current_tracker_instance_->countdown_,
-                                    "Object was re-destroyed.");
-    }
-    tracked_address.is_alive = false;
-  }
-
- private:
-  static bool CurrentlyTracking() {
-    return current_tracker_instance_ != nullptr;
-  }
-
-  static std::string ErrorMessage(void* address,
-                                  const std::string& address_description,
-                                  int countdown,
-                                  const std::string& error_description) {
-    return absl::Substitute(
-        "With coundtown at $0:\n"
-        "  $1\n"
-        "  Object originally constructed by $2\n"
-        "  Object address: $3\n",
-        countdown, error_description, address_description, address);
-  }
-
-  std::unordered_map<void*, TrackedAddress> address_map_;
-  int countdown_;
-
-  static ConstructorTracker* current_tracker_instance_;
-};
-
-class TrackedObject {
- public:
-  TrackedObject(const TrackedObject&) = delete;
-  TrackedObject(TrackedObject&&) = delete;
-
- protected:
-  explicit TrackedObject(std::string description) {
-    ConstructorTracker::ObjectConstructed(this, std::move(description));
-  }
-
-  ~TrackedObject() noexcept { ConstructorTracker::ObjectDestructed(this); }
-};
-}  // namespace exceptions_internal
-
-extern exceptions_internal::NoThrowTag nothrow_ctor;
-
-extern exceptions_internal::StrongGuaranteeTagType strong_guarantee;
-
-// A test class which is convertible to bool.  The conversion can be
-// instrumented to throw at a controlled time.
-class ThrowingBool {
- public:
-  ThrowingBool(bool b) noexcept : b_(b) {}  // NOLINT(runtime/explicit)
-  operator bool() const {                   // NOLINT
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return b_;
-  }
-
- private:
-  bool b_;
-};
-
-/*
- * Configuration enum for the ThrowingValue type that defines behavior for the
- * lifetime of the instance. Use testing::nothrow_ctor to prevent the integer
- * constructor from throwing.
- *
- * kEverythingThrows: Every operation can throw an exception
- * kNoThrowCopy: Copy construction and copy assignment will not throw
- * kNoThrowMove: Move construction and move assignment will not throw
- * kNoThrowNew: Overloaded operators new and new[] will not throw
- */
-enum class TypeSpec {
-  kEverythingThrows = 0,
-  kNoThrowCopy = 1,
-  kNoThrowMove = 1 << 1,
-  kNoThrowNew = 1 << 2,
-};
-
-/*
- * A testing class instrumented to throw an exception at a controlled time.
- *
- * ThrowingValue implements a slightly relaxed version of the Regular concept --
- * that is it's a value type with the expected semantics.  It also implements
- * arithmetic operations.  It doesn't implement member and pointer operators
- * like operator-> or operator[].
- *
- * ThrowingValue can be instrumented to have certain operations be noexcept by
- * using compile-time bitfield template arguments.  That is, to make an
- * ThrowingValue which has noexcept move construction/assignment and noexcept
- * copy construction/assignment, use the following:
- *   ThrowingValue<testing::kNoThrowMove | testing::kNoThrowCopy> my_thrwr{val};
- */
-template <TypeSpec Spec = TypeSpec::kEverythingThrows>
-class ThrowingValue : private exceptions_internal::TrackedObject {
-  static constexpr bool IsSpecified(TypeSpec spec) {
-    return static_cast<bool>(Spec & spec);
-  }
-
-  static constexpr int kDefaultValue = 0;
-  static constexpr int kBadValue = 938550620;
-
- public:
-  ThrowingValue() : TrackedObject(GetInstanceString(kDefaultValue)) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ = kDefaultValue;
-  }
-
-  ThrowingValue(const ThrowingValue& other) noexcept(
-      IsSpecified(TypeSpec::kNoThrowCopy))
-      : TrackedObject(GetInstanceString(other.dummy_)) {
-    if (!IsSpecified(TypeSpec::kNoThrowCopy)) {
-      exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    }
-    dummy_ = other.dummy_;
-  }
-
-  ThrowingValue(ThrowingValue&& other) noexcept(
-      IsSpecified(TypeSpec::kNoThrowMove))
-      : TrackedObject(GetInstanceString(other.dummy_)) {
-    if (!IsSpecified(TypeSpec::kNoThrowMove)) {
-      exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    }
-    dummy_ = other.dummy_;
-  }
-
-  explicit ThrowingValue(int i) : TrackedObject(GetInstanceString(i)) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ = i;
-  }
-
-  ThrowingValue(int i, exceptions_internal::NoThrowTag) noexcept
-      : TrackedObject(GetInstanceString(i)), dummy_(i) {}
-
-  // absl expects nothrow destructors
-  ~ThrowingValue() noexcept = default;
-
-  ThrowingValue& operator=(const ThrowingValue& other) noexcept(
-      IsSpecified(TypeSpec::kNoThrowCopy)) {
-    dummy_ = kBadValue;
-    if (!IsSpecified(TypeSpec::kNoThrowCopy)) {
-      exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    }
-    dummy_ = other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator=(ThrowingValue&& other) noexcept(
-      IsSpecified(TypeSpec::kNoThrowMove)) {
-    dummy_ = kBadValue;
-    if (!IsSpecified(TypeSpec::kNoThrowMove)) {
-      exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    }
-    dummy_ = other.dummy_;
-    return *this;
-  }
-
-  // Arithmetic Operators
-  ThrowingValue operator+(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ + other.dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator+() const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator-(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ - other.dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator-() const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(-dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue& operator++() {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    ++dummy_;
-    return *this;
-  }
-
-  ThrowingValue operator++(int) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    auto out = ThrowingValue(dummy_, nothrow_ctor);
-    ++dummy_;
-    return out;
-  }
-
-  ThrowingValue& operator--() {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    --dummy_;
-    return *this;
-  }
-
-  ThrowingValue operator--(int) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    auto out = ThrowingValue(dummy_, nothrow_ctor);
-    --dummy_;
-    return out;
-  }
-
-  ThrowingValue operator*(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ * other.dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator/(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ / other.dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator%(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ % other.dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator<<(int shift) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ << shift, nothrow_ctor);
-  }
-
-  ThrowingValue operator>>(int shift) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ >> shift, nothrow_ctor);
-  }
-
-  // Comparison Operators
-  // NOTE: We use `ThrowingBool` instead of `bool` because most STL
-  // types/containers requires T to be convertible to bool.
-  friend ThrowingBool operator==(const ThrowingValue& a,
-                                 const ThrowingValue& b) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return a.dummy_ == b.dummy_;
-  }
-  friend ThrowingBool operator!=(const ThrowingValue& a,
-                                 const ThrowingValue& b) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return a.dummy_ != b.dummy_;
-  }
-  friend ThrowingBool operator<(const ThrowingValue& a,
-                                const ThrowingValue& b) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return a.dummy_ < b.dummy_;
-  }
-  friend ThrowingBool operator<=(const ThrowingValue& a,
-                                 const ThrowingValue& b) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return a.dummy_ <= b.dummy_;
-  }
-  friend ThrowingBool operator>(const ThrowingValue& a,
-                                const ThrowingValue& b) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return a.dummy_ > b.dummy_;
-  }
-  friend ThrowingBool operator>=(const ThrowingValue& a,
-                                 const ThrowingValue& b) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return a.dummy_ >= b.dummy_;
-  }
-
-  // Logical Operators
-  ThrowingBool operator!() const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return !dummy_;
-  }
-
-  ThrowingBool operator&&(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return dummy_ && other.dummy_;
-  }
-
-  ThrowingBool operator||(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return dummy_ || other.dummy_;
-  }
-
-  // Bitwise Logical Operators
-  ThrowingValue operator~() const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(~dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator&(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ & other.dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator|(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ | other.dummy_, nothrow_ctor);
-  }
-
-  ThrowingValue operator^(const ThrowingValue& other) const {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return ThrowingValue(dummy_ ^ other.dummy_, nothrow_ctor);
-  }
-
-  // Compound Assignment operators
-  ThrowingValue& operator+=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ += other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator-=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ -= other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator*=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ *= other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator/=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ /= other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator%=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ %= other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator&=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ &= other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator|=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ |= other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator^=(const ThrowingValue& other) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ ^= other.dummy_;
-    return *this;
-  }
-
-  ThrowingValue& operator<<=(int shift) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ <<= shift;
-    return *this;
-  }
-
-  ThrowingValue& operator>>=(int shift) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ >>= shift;
-    return *this;
-  }
-
-  // Pointer operators
-  void operator&() const = delete;  // NOLINT(runtime/operator)
-
-  // Stream operators
-  friend std::ostream& operator<<(std::ostream& os, const ThrowingValue& tv) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return os << GetInstanceString(tv.dummy_);
-  }
-
-  friend std::istream& operator>>(std::istream& is, const ThrowingValue&) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    return is;
-  }
-
-  // Memory management operators
-  // Args.. allows us to overload regular and placement new in one shot
-  template <typename... Args>
-  static void* operator new(size_t s, Args&&... args) noexcept(
-      IsSpecified(TypeSpec::kNoThrowNew)) {
-    if (!IsSpecified(TypeSpec::kNoThrowNew)) {
-      exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION, true);
-    }
-    return ::operator new(s, std::forward<Args>(args)...);
-  }
-
-  template <typename... Args>
-  static void* operator new[](size_t s, Args&&... args) noexcept(
-      IsSpecified(TypeSpec::kNoThrowNew)) {
-    if (!IsSpecified(TypeSpec::kNoThrowNew)) {
-      exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION, true);
-    }
-    return ::operator new[](s, std::forward<Args>(args)...);
-  }
-
-  // Abseil doesn't support throwing overloaded operator delete.  These are
-  // provided so a throwing operator-new can clean up after itself.
-  //
-  // We provide both regular and templated operator delete because if only the
-  // templated version is provided as we did with operator new, the compiler has
-  // no way of knowing which overload of operator delete to call. See
-  // https://en.cppreference.com/w/cpp/memory/new/operator_delete and
-  // https://en.cppreference.com/w/cpp/language/delete for the gory details.
-  void operator delete(void* p) noexcept { ::operator delete(p); }
-
-  template <typename... Args>
-  void operator delete(void* p, Args&&... args) noexcept {
-    ::operator delete(p, std::forward<Args>(args)...);
-  }
-
-  void operator delete[](void* p) noexcept { return ::operator delete[](p); }
-
-  template <typename... Args>
-  void operator delete[](void* p, Args&&... args) noexcept {
-    return ::operator delete[](p, std::forward<Args>(args)...);
-  }
-
-  // Non-standard access to the actual contained value.  No need for this to
-  // throw.
-  int& Get() noexcept { return dummy_; }
-  const int& Get() const noexcept { return dummy_; }
-
- private:
-  static std::string GetInstanceString(int dummy) {
-    return absl::StrCat("ThrowingValue<",
-                        exceptions_internal::GetSpecString(Spec), ">(", dummy,
-                        ")");
-  }
-
-  int dummy_;
-};
-// While not having to do with exceptions, explicitly delete comma operator, to
-// make sure we don't use it on user-supplied types.
-template <TypeSpec Spec, typename T>
-void operator,(const ThrowingValue<Spec>&, T&&) = delete;
-template <TypeSpec Spec, typename T>
-void operator,(T&&, const ThrowingValue<Spec>&) = delete;
-
-/*
- * Configuration enum for the ThrowingAllocator type that defines behavior for
- * the lifetime of the instance.
- *
- * kEverythingThrows: Calls to the member functions may throw
- * kNoThrowAllocate: Calls to the member functions will not throw
- */
-enum class AllocSpec {
-  kEverythingThrows = 0,
-  kNoThrowAllocate = 1,
-};
-
-/*
- * An allocator type which is instrumented to throw at a controlled time, or not
- * to throw, using AllocSpec. The supported settings are the default of every
- * function which is allowed to throw in a conforming allocator possibly
- * throwing, or nothing throws, in line with the ABSL_ALLOCATOR_THROWS
- * configuration macro.
- */
-template <typename T, AllocSpec Spec = AllocSpec::kEverythingThrows>
-class ThrowingAllocator : private exceptions_internal::TrackedObject {
-  static constexpr bool IsSpecified(AllocSpec spec) {
-    return static_cast<bool>(Spec & spec);
-  }
-
- public:
-  using pointer = T*;
-  using const_pointer = const T*;
-  using reference = T&;
-  using const_reference = const T&;
-  using void_pointer = void*;
-  using const_void_pointer = const void*;
-  using value_type = T;
-  using size_type = size_t;
-  using difference_type = ptrdiff_t;
-
-  using is_nothrow =
-      std::integral_constant<bool, Spec == AllocSpec::kNoThrowAllocate>;
-  using propagate_on_container_copy_assignment = std::true_type;
-  using propagate_on_container_move_assignment = std::true_type;
-  using propagate_on_container_swap = std::true_type;
-  using is_always_equal = std::false_type;
-
-  ThrowingAllocator() : TrackedObject(GetInstanceString(next_id_)) {
-    exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
-    dummy_ = std::make_shared<const int>(next_id_++);
-  }
-
-  template <typename U>
-  ThrowingAllocator(const ThrowingAllocator<U, Spec>& other) noexcept  // NOLINT
-      : TrackedObject(GetInstanceString(*other.State())),
-        dummy_(other.State()) {}
-
-  // According to C++11 standard [17.6.3.5], Table 28, the move/copy ctors of
-  // allocator shall not exit via an exception, thus they are marked noexcept.
-  ThrowingAllocator(const ThrowingAllocator& other) noexcept
-      : TrackedObject(GetInstanceString(*other.State())),
-        dummy_(other.State()) {}
-
-  template <typename U>
-  ThrowingAllocator(ThrowingAllocator<U, Spec>&& other) noexcept  // NOLINT
-      : TrackedObject(GetInstanceString(*other.State())),
-        dummy_(std::move(other.State())) {}
-
-  ThrowingAllocator(ThrowingAllocator&& other) noexcept
-      : TrackedObject(GetInstanceString(*other.State())),
-        dummy_(std::move(other.State())) {}
-
-  ~ThrowingAllocator() noexcept = default;
-
-  ThrowingAllocator& operator=(const ThrowingAllocator& other) noexcept {
-    dummy_ = other.State();
-    return *this;
-  }
-
-  template <typename U>
-  ThrowingAllocator& operator=(
-      const ThrowingAllocator<U, Spec>& other) noexcept {
-    dummy_ = other.State();
-    return *this;
-  }
-
-  template <typename U>
-  ThrowingAllocator& operator=(ThrowingAllocator<U, Spec>&& other) noexcept {
-    dummy_ = std::move(other.State());
-    return *this;
-  }
-
-  template <typename U>
-  struct rebind {
-    using other = ThrowingAllocator<U, Spec>;
-  };
-
-  pointer allocate(size_type n) noexcept(
-      IsSpecified(AllocSpec::kNoThrowAllocate)) {
-    ReadStateAndMaybeThrow(ABSL_PRETTY_FUNCTION);
-    return static_cast<pointer>(::operator new(n * sizeof(T)));
-  }
-
-  pointer allocate(size_type n, const_void_pointer) noexcept(
-      IsSpecified(AllocSpec::kNoThrowAllocate)) {
-    return allocate(n);
-  }
-
-  void deallocate(pointer ptr, size_type) noexcept {
-    ReadState();
-    ::operator delete(static_cast<void*>(ptr));
-  }
-
-  template <typename U, typename... Args>
-  void construct(U* ptr, Args&&... args) noexcept(
-      IsSpecified(AllocSpec::kNoThrowAllocate)) {
-    ReadStateAndMaybeThrow(ABSL_PRETTY_FUNCTION);
-    ::new (static_cast<void*>(ptr)) U(std::forward<Args>(args)...);
-  }
-
-  template <typename U>
-  void destroy(U* p) noexcept {
-    ReadState();
-    p->~U();
-  }
-
-  size_type max_size() const noexcept {
-    return (std::numeric_limits<difference_type>::max)() / sizeof(value_type);
-  }
-
-  ThrowingAllocator select_on_container_copy_construction() noexcept(
-      IsSpecified(AllocSpec::kNoThrowAllocate)) {
-    auto& out = *this;
-    ReadStateAndMaybeThrow(ABSL_PRETTY_FUNCTION);
-    return out;
-  }
-
-  template <typename U>
-  bool operator==(const ThrowingAllocator<U, Spec>& other) const noexcept {
-    return dummy_ == other.dummy_;
-  }
-
-  template <typename U>
-  bool operator!=(const ThrowingAllocator<U, Spec>& other) const noexcept {
-    return dummy_ != other.dummy_;
-  }
-
-  template <typename, AllocSpec>
-  friend class ThrowingAllocator;
-
- private:
-  static std::string GetInstanceString(int dummy) {
-    return absl::StrCat("ThrowingAllocator<",
-                        exceptions_internal::GetSpecString(Spec), ">(", dummy,
-                        ")");
-  }
-
-  const std::shared_ptr<const int>& State() const { return dummy_; }
-  std::shared_ptr<const int>& State() { return dummy_; }
-
-  void ReadState() {
-    // we know that this will never be true, but the compiler doesn't, so this
-    // should safely force a read of the value.
-    if (*dummy_ < 0) std::abort();
-  }
-
-  void ReadStateAndMaybeThrow(absl::string_view msg) const {
-    if (!IsSpecified(AllocSpec::kNoThrowAllocate)) {
-      exceptions_internal::MaybeThrow(
-          absl::Substitute("Allocator id $0 threw from $1", *dummy_, msg));
-    }
-  }
-
-  static int next_id_;
-  std::shared_ptr<const int> dummy_;
-};
-
-template <typename T, AllocSpec Spec>
-int ThrowingAllocator<T, Spec>::next_id_ = 0;
-
-// Tests for resource leaks by attempting to construct a T using args repeatedly
-// until successful, using the countdown method.  Side effects can then be
-// tested for resource leaks.
-template <typename T, typename... Args>
-void TestThrowingCtor(Args&&... args) {
-  struct Cleanup {
-    ~Cleanup() { exceptions_internal::UnsetCountdown(); }
-  } c;
-  for (int count = 0;; ++count) {
-    exceptions_internal::ConstructorTracker ct(count);
-    exceptions_internal::SetCountdown(count);
-    try {
-      T temp(std::forward<Args>(args)...);
-      static_cast<void>(temp);
-      break;
-    } catch (const exceptions_internal::TestException&) {
-    }
-  }
-}
-
-// Tests the nothrow guarantee of the provided nullary operation. If the an
-// exception is thrown, the result will be AssertionFailure(). Otherwise, it
-// will be AssertionSuccess().
-template <typename Operation>
-testing::AssertionResult TestNothrowOp(const Operation& operation) {
-  struct Cleanup {
-    Cleanup() { exceptions_internal::SetCountdown(); }
-    ~Cleanup() { exceptions_internal::UnsetCountdown(); }
-  } c;
-  try {
-    operation();
-    return testing::AssertionSuccess();
-  } catch (const exceptions_internal::TestException&) {
-    return testing::AssertionFailure()
-           << "TestException thrown during call to operation() when nothrow "
-              "guarantee was expected.";
-  } catch (...) {
-    return testing::AssertionFailure()
-           << "Unknown exception thrown during call to operation() when "
-              "nothrow guarantee was expected.";
-  }
-}
-
-namespace exceptions_internal {
-
-// Dummy struct for ExceptionSafetyTestBuilder<> partial state.
-struct UninitializedT {};
-
-template <typename T>
-class DefaultFactory {
- public:
-  explicit DefaultFactory(const T& t) : t_(t) {}
-  std::unique_ptr<T> operator()() const { return absl::make_unique<T>(t_); }
-
- private:
-  T t_;
-};
-
-template <size_t LazyContractsCount, typename LazyFactory,
-          typename LazyOperation>
-using EnableIfTestable = typename absl::enable_if_t<
-    LazyContractsCount != 0 &&
-    !std::is_same<LazyFactory, UninitializedT>::value &&
-    !std::is_same<LazyOperation, UninitializedT>::value>;
-
-template <typename Factory = UninitializedT,
-          typename Operation = UninitializedT, typename... Contracts>
-class ExceptionSafetyTestBuilder;
-
-}  // namespace exceptions_internal
-
-/*
- * Constructs an empty ExceptionSafetyTestBuilder. All
- * ExceptionSafetyTestBuilder objects are immutable and all With[thing] mutation
- * methods return new instances of ExceptionSafetyTestBuilder.
- *
- * In order to test a T for exception safety, a factory for that T, a testable
- * operation, and at least one contract callback returning an assertion
- * result must be applied using the respective methods.
- */
-exceptions_internal::ExceptionSafetyTestBuilder<> MakeExceptionSafetyTester();
-
-namespace exceptions_internal {
-template <typename T>
-struct IsUniquePtr : std::false_type {};
-
-template <typename T, typename D>
-struct IsUniquePtr<std::unique_ptr<T, D>> : std::true_type {};
-
-template <typename Factory>
-struct FactoryPtrTypeHelper {
-  using type = decltype(std::declval<const Factory&>()());
-
-  static_assert(IsUniquePtr<type>::value, "Factories must return a unique_ptr");
-};
-
-template <typename Factory>
-using FactoryPtrType = typename FactoryPtrTypeHelper<Factory>::type;
-
-template <typename Factory>
-using FactoryElementType = typename FactoryPtrType<Factory>::element_type;
-
-template <typename T>
-class ExceptionSafetyTest {
-  using Factory = std::function<std::unique_ptr<T>()>;
-  using Operation = std::function<void(T*)>;
-  using Contract = std::function<AssertionResult(T*)>;
-
- public:
-  template <typename... Contracts>
-  explicit ExceptionSafetyTest(const Factory& f, const Operation& op,
-                               const Contracts&... contracts)
-      : factory_(f), operation_(op), contracts_{WrapContract(contracts)...} {}
-
-  AssertionResult Test() const {
-    for (int count = 0;; ++count) {
-      exceptions_internal::ConstructorTracker ct(count);
-
-      for (const auto& contract : contracts_) {
-        auto t_ptr = factory_();
-        try {
-          SetCountdown(count);
-          operation_(t_ptr.get());
-          // Unset for the case that the operation throws no exceptions, which
-          // would leave the countdown set and break the *next* exception safety
-          // test after this one.
-          UnsetCountdown();
-          return AssertionSuccess();
-        } catch (const exceptions_internal::TestException& e) {
-          if (!contract(t_ptr.get())) {
-            return AssertionFailure() << e.what() << " failed contract check";
-          }
-        }
-      }
-    }
-  }
-
- private:
-  template <typename ContractFn>
-  Contract WrapContract(const ContractFn& contract) {
-    return [contract](T* t_ptr) { return AssertionResult(contract(t_ptr)); };
-  }
-
-  Contract WrapContract(StrongGuaranteeTagType) {
-    return [this](T* t_ptr) { return AssertionResult(*factory_() == *t_ptr); };
-  }
-
-  Factory factory_;
-  Operation operation_;
-  std::vector<Contract> contracts_;
-};
-
-/*
- * Builds a tester object that tests if performing a operation on a T follows
- * exception safety guarantees. Verification is done via contract assertion
- * callbacks applied to T instances post-throw.
- *
- * Template parameters for ExceptionSafetyTestBuilder:
- *
- * - Factory: The factory object (passed in via tester.WithFactory(...) or
- *   tester.WithInitialValue(...)) must be invocable with the signature
- *   `std::unique_ptr<T> operator()() const` where T is the type being tested.
- *   It is used for reliably creating identical T instances to test on.
- *
- * - Operation: The operation object (passsed in via tester.WithOperation(...)
- *   or tester.Test(...)) must be invocable with the signature
- *   `void operator()(T*) const` where T is the type being tested. It is used
- *   for performing steps on a T instance that may throw and that need to be
- *   checked for exception safety. Each call to the operation will receive a
- *   fresh T instance so it's free to modify and destroy the T instances as it
- *   pleases.
- *
- * - Contracts...: The contract assertion callback objects (passed in via
- *   tester.WithContracts(...)) must be invocable with the signature
- *   `testing::AssertionResult operator()(T*) const` where T is the type being
- *   tested. Contract assertion callbacks are provided T instances post-throw.
- *   They must return testing::AssertionSuccess when the type contracts of the
- *   provided T instance hold. If the type contracts of the T instance do not
- *   hold, they must return testing::AssertionFailure. Execution order of
- *   Contracts... is unspecified. They will each individually get a fresh T
- *   instance so they are free to modify and destroy the T instances as they
- *   please.
- */
-template <typename Factory, typename Operation, typename... Contracts>
-class ExceptionSafetyTestBuilder {
- public:
-  /*
-   * Returns a new ExceptionSafetyTestBuilder with an included T factory based
-   * on the provided T instance. The existing factory will not be included in
-   * the newly created tester instance. The created factory returns a new T
-   * instance by copy-constructing the provided const T& t.
-   *
-   * Preconditions for tester.WithInitialValue(const T& t):
-   *
-   * - The const T& t object must be copy-constructible where T is the type
-   *   being tested. For non-copy-constructible objects, use the method
-   *   tester.WithFactory(...).
-   */
-  template <typename T>
-  ExceptionSafetyTestBuilder<DefaultFactory<T>, Operation, Contracts...>
-  WithInitialValue(const T& t) const {
-    return WithFactory(DefaultFactory<T>(t));
-  }
-
-  /*
-   * Returns a new ExceptionSafetyTestBuilder with the provided T factory
-   * included. The existing factory will not be included in the newly-created
-   * tester instance. This method is intended for use with types lacking a copy
-   * constructor. Types that can be copy-constructed should instead use the
-   * method tester.WithInitialValue(...).
-   */
-  template <typename NewFactory>
-  ExceptionSafetyTestBuilder<absl::decay_t<NewFactory>, Operation, Contracts...>
-  WithFactory(const NewFactory& new_factory) const {
-    return {new_factory, operation_, contracts_};
-  }
-
-  /*
-   * Returns a new ExceptionSafetyTestBuilder with the provided testable
-   * operation included. The existing operation will not be included in the
-   * newly created tester.
-   */
-  template <typename NewOperation>
-  ExceptionSafetyTestBuilder<Factory, absl::decay_t<NewOperation>, Contracts...>
-  WithOperation(const NewOperation& new_operation) const {
-    return {factory_, new_operation, contracts_};
-  }
-
-  /*
-   * Returns a new ExceptionSafetyTestBuilder with the provided MoreContracts...
-   * combined with the Contracts... that were already included in the instance
-   * on which the method was called. Contracts... cannot be removed or replaced
-   * once added to an ExceptionSafetyTestBuilder instance. A fresh object must
-   * be created in order to get an empty Contracts... list.
-   *
-   * In addition to passing in custom contract assertion callbacks, this method
-   * accepts `testing::strong_guarantee` as an argument which checks T instances
-   * post-throw against freshly created T instances via operator== to verify
-   * that any state changes made during the execution of the operation were
-   * properly rolled back.
-   */
-  template <typename... MoreContracts>
-  ExceptionSafetyTestBuilder<Factory, Operation, Contracts...,
-                             absl::decay_t<MoreContracts>...>
-  WithContracts(const MoreContracts&... more_contracts) const {
-    return {
-        factory_, operation_,
-        std::tuple_cat(contracts_, std::tuple<absl::decay_t<MoreContracts>...>(
-                                       more_contracts...))};
-  }
-
-  /*
-   * Returns a testing::AssertionResult that is the reduced result of the
-   * exception safety algorithm. The algorithm short circuits and returns
-   * AssertionFailure after the first contract callback returns an
-   * AssertionFailure. Otherwise, if all contract callbacks return an
-   * AssertionSuccess, the reduced result is AssertionSuccess.
-   *
-   * The passed-in testable operation will not be saved in a new tester instance
-   * nor will it modify/replace the existing tester instance. This is useful
-   * when each operation being tested is unique and does not need to be reused.
-   *
-   * Preconditions for tester.Test(const NewOperation& new_operation):
-   *
-   * - May only be called after at least one contract assertion callback and a
-   *   factory or initial value have been provided.
-   */
-  template <
-      typename NewOperation,
-      typename = EnableIfTestable<sizeof...(Contracts), Factory, NewOperation>>
-  testing::AssertionResult Test(const NewOperation& new_operation) const {
-    return TestImpl(new_operation, absl::index_sequence_for<Contracts...>());
-  }
-
-  /*
-   * Returns a testing::AssertionResult that is the reduced result of the
-   * exception safety algorithm. The algorithm short circuits and returns
-   * AssertionFailure after the first contract callback returns an
-   * AssertionFailure. Otherwise, if all contract callbacks return an
-   * AssertionSuccess, the reduced result is AssertionSuccess.
-   *
-   * Preconditions for tester.Test():
-   *
-   * - May only be called after at least one contract assertion callback, a
-   *   factory or initial value and a testable operation have been provided.
-   */
-  template <
-      typename LazyOperation = Operation,
-      typename = EnableIfTestable<sizeof...(Contracts), Factory, LazyOperation>>
-  testing::AssertionResult Test() const {
-    return Test(operation_);
-  }
-
- private:
-  template <typename, typename, typename...>
-  friend class ExceptionSafetyTestBuilder;
-
-  friend ExceptionSafetyTestBuilder<> testing::MakeExceptionSafetyTester();
-
-  ExceptionSafetyTestBuilder() {}
-
-  ExceptionSafetyTestBuilder(const Factory& f, const Operation& o,
-                             const std::tuple<Contracts...>& i)
-      : factory_(f), operation_(o), contracts_(i) {}
-
-  template <typename SelectedOperation, size_t... Indices>
-  testing::AssertionResult TestImpl(SelectedOperation selected_operation,
-                                    absl::index_sequence<Indices...>) const {
-    return ExceptionSafetyTest<FactoryElementType<Factory>>(
-               factory_, selected_operation, std::get<Indices>(contracts_)...)
-        .Test();
-  }
-
-  Factory factory_;
-  Operation operation_;
-  std::tuple<Contracts...> contracts_;
-};
-
-}  // namespace exceptions_internal
-
-}  // namespace testing
-
-#endif  // ABSL_HAVE_EXCEPTIONS
-
-#endif  // ABSL_BASE_INTERNAL_EXCEPTION_SAFETY_TESTING_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/exception_testing.h b/third_party/abseil_cpp/absl/base/internal/exception_testing.h
deleted file mode 100644
index 01b546557117..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/exception_testing.h
+++ /dev/null
@@ -1,42 +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.
-
-// Testing utilities for ABSL types which throw exceptions.
-
-#ifndef ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
-#define ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
-
-#include "gtest/gtest.h"
-#include "absl/base/config.h"
-
-// ABSL_BASE_INTERNAL_EXPECT_FAIL tests either for a specified thrown exception
-// if exceptions are enabled, or for death with a specified text in the error
-// message
-#ifdef ABSL_HAVE_EXCEPTIONS
-
-#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
-  EXPECT_THROW(expr, exception_t)
-
-#elif defined(__ANDROID__)
-// Android asserts do not log anywhere that gtest can currently inspect.
-// So we expect exit, but cannot match the message.
-#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
-  EXPECT_DEATH(expr, ".*")
-#else
-#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
-  EXPECT_DEATH_IF_SUPPORTED(expr, text)
-
-#endif
-
-#endif  // ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/exponential_biased.cc b/third_party/abseil_cpp/absl/base/internal/exponential_biased.cc
deleted file mode 100644
index 1b30c061e3bd..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/exponential_biased.cc
+++ /dev/null
@@ -1,93 +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.
-
-#include "absl/base/internal/exponential_biased.h"
-
-#include <stdint.h>
-
-#include <algorithm>
-#include <atomic>
-#include <cmath>
-#include <limits>
-
-#include "absl/base/attributes.h"
-#include "absl/base/optimization.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// The algorithm generates a random number between 0 and 1 and applies the
-// inverse cumulative distribution function for an exponential. Specifically:
-// Let m be the inverse of the sample period, then the probability
-// distribution function is m*exp(-mx) so the CDF is
-// p = 1 - exp(-mx), so
-// q = 1 - p = exp(-mx)
-// log_e(q) = -mx
-// -log_e(q)/m = x
-// log_2(q) * (-log_e(2) * 1/m) = x
-// In the code, q is actually in the range 1 to 2**26, hence the -26 below
-int64_t ExponentialBiased::GetSkipCount(int64_t mean) {
-  if (ABSL_PREDICT_FALSE(!initialized_)) {
-    Initialize();
-  }
-
-  uint64_t rng = NextRandom(rng_);
-  rng_ = rng;
-
-  // Take the top 26 bits as the random number
-  // (This plus the 1<<58 sampling bound give a max possible step of
-  // 5194297183973780480 bytes.)
-  // The uint32_t cast is to prevent a (hard-to-reproduce) NAN
-  // under piii debug for some binaries.
-  double q = static_cast<uint32_t>(rng >> (kPrngNumBits - 26)) + 1.0;
-  // Put the computed p-value through the CDF of a geometric.
-  double interval = bias_ + (std::log2(q) - 26) * (-std::log(2.0) * mean);
-  // Very large values of interval overflow int64_t. To avoid that, we will
-  // cheat and clamp any huge values to (int64_t max)/2. This is a potential
-  // source of bias, but the mean would need to be such a large value that it's
-  // not likely to come up. For example, with a mean of 1e18, the probability of
-  // hitting this condition is about 1/1000. For a mean of 1e17, standard
-  // calculators claim that this event won't happen.
-  if (interval > static_cast<double>(std::numeric_limits<int64_t>::max() / 2)) {
-    // Assume huge values are bias neutral, retain bias for next call.
-    return std::numeric_limits<int64_t>::max() / 2;
-  }
-  double value = std::round(interval);
-  bias_ = interval - value;
-  return value;
-}
-
-int64_t ExponentialBiased::GetStride(int64_t mean) {
-  return GetSkipCount(mean - 1) + 1;
-}
-
-void ExponentialBiased::Initialize() {
-  // We don't get well distributed numbers from `this` so we call NextRandom() a
-  // bunch to mush the bits around. We use a global_rand to handle the case
-  // where the same thread (by memory address) gets created and destroyed
-  // repeatedly.
-  ABSL_CONST_INIT static std::atomic<uint32_t> global_rand(0);
-  uint64_t r = reinterpret_cast<uint64_t>(this) +
-               global_rand.fetch_add(1, std::memory_order_relaxed);
-  for (int i = 0; i < 20; ++i) {
-    r = NextRandom(r);
-  }
-  rng_ = r;
-  initialized_ = true;
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/exponential_biased.h b/third_party/abseil_cpp/absl/base/internal/exponential_biased.h
deleted file mode 100644
index 94f79a3378db..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/exponential_biased.h
+++ /dev/null
@@ -1,130 +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_BASE_INTERNAL_EXPONENTIAL_BIASED_H_
-#define ABSL_BASE_INTERNAL_EXPONENTIAL_BIASED_H_
-
-#include <stdint.h>
-
-#include "absl/base/config.h"
-#include "absl/base/macros.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// ExponentialBiased provides a small and fast random number generator for a
-// rounded exponential distribution. This generator manages very little state,
-// and imposes no synchronization overhead. This makes it useful in specialized
-// scenarios requiring minimum overhead, such as stride based periodic sampling.
-//
-// ExponentialBiased provides two closely related functions, GetSkipCount() and
-// GetStride(), both returning a rounded integer defining a number of events
-// required before some event with a given mean probability occurs.
-//
-// The distribution is useful to generate a random wait time or some periodic
-// event with a given mean probability. For example, if an action is supposed to
-// happen on average once every 'N' events, then we can get a random 'stride'
-// counting down how long before the event to happen. For example, if we'd want
-// to sample one in every 1000 'Frobber' calls, our code could look like this:
-//
-//   Frobber::Frobber() {
-//     stride_ = exponential_biased_.GetStride(1000);
-//   }
-//
-//   void Frobber::Frob(int arg) {
-//     if (--stride == 0) {
-//       SampleFrob(arg);
-//       stride_ = exponential_biased_.GetStride(1000);
-//     }
-//     ...
-//   }
-//
-// The rounding of the return value creates a bias, especially for smaller means
-// where the distribution of the fraction is not evenly distributed. We correct
-// this bias by tracking the fraction we rounded up or down on each iteration,
-// effectively tracking the distance between the cumulative value, and the
-// rounded cumulative value. For example, given a mean of 2:
-//
-//   raw = 1.63076, cumulative = 1.63076, rounded = 2, bias = -0.36923
-//   raw = 0.14624, cumulative = 1.77701, rounded = 2, bias =  0.14624
-//   raw = 4.93194, cumulative = 6.70895, rounded = 7, bias = -0.06805
-//   raw = 0.24206, cumulative = 6.95101, rounded = 7, bias =  0.24206
-//   etc...
-//
-// Adjusting with rounding bias is relatively trivial:
-//
-//    double value = bias_ + exponential_distribution(mean)();
-//    double rounded_value = std::round(value);
-//    bias_ = value - rounded_value;
-//    return rounded_value;
-//
-// This class is thread-compatible.
-class ExponentialBiased {
- public:
-  // The number of bits set by NextRandom.
-  static constexpr int kPrngNumBits = 48;
-
-  // `GetSkipCount()` returns the number of events to skip before some chosen
-  // event happens. For example, randomly tossing a coin, we will on average
-  // throw heads once before we get tails. We can simulate random coin tosses
-  // using GetSkipCount() as:
-  //
-  //   ExponentialBiased eb;
-  //   for (...) {
-  //     int number_of_heads_before_tail = eb.GetSkipCount(1);
-  //     for (int flips = 0; flips < number_of_heads_before_tail; ++flips) {
-  //       printf("head...");
-  //     }
-  //     printf("tail\n");
-  //   }
-  //
-  int64_t GetSkipCount(int64_t mean);
-
-  // GetStride() returns the number of events required for a specific event to
-  // happen. See the class comments for a usage example. `GetStride()` is
-  // equivalent to `GetSkipCount(mean - 1) + 1`. When to use `GetStride()` or
-  // `GetSkipCount()` depends mostly on what best fits the use case.
-  int64_t GetStride(int64_t mean);
-
-  // Computes a random number in the range [0, 1<<(kPrngNumBits+1) - 1]
-  //
-  // This is public to enable testing.
-  static uint64_t NextRandom(uint64_t rnd);
-
- private:
-  void Initialize();
-
-  uint64_t rng_{0};
-  double bias_{0};
-  bool initialized_{false};
-};
-
-// Returns the next prng value.
-// pRNG is: aX+b mod c with a = 0x5DEECE66D, b =  0xB, c = 1<<48
-// This is the lrand64 generator.
-inline uint64_t ExponentialBiased::NextRandom(uint64_t rnd) {
-  const uint64_t prng_mult = uint64_t{0x5DEECE66D};
-  const uint64_t prng_add = 0xB;
-  const uint64_t prng_mod_power = 48;
-  const uint64_t prng_mod_mask =
-      ~((~static_cast<uint64_t>(0)) << prng_mod_power);
-  return (prng_mult * rnd + prng_add) & prng_mod_mask;
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_EXPONENTIAL_BIASED_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/exponential_biased_test.cc b/third_party/abseil_cpp/absl/base/internal/exponential_biased_test.cc
deleted file mode 100644
index 075583ca6fd4..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/exponential_biased_test.cc
+++ /dev/null
@@ -1,199 +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.
-
-#include "absl/base/internal/exponential_biased.h"
-
-#include <stddef.h>
-
-#include <cmath>
-#include <cstdint>
-#include <vector>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/strings/str_cat.h"
-
-using ::testing::Ge;
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-MATCHER_P2(IsBetween, a, b,
-           absl::StrCat(std::string(negation ? "isn't" : "is"), " between ", a,
-                        " and ", b)) {
-  return a <= arg && arg <= b;
-}
-
-// Tests of the quality of the random numbers generated
-// This uses the Anderson Darling test for uniformity.
-// See "Evaluating the Anderson-Darling Distribution" by Marsaglia
-// for details.
-
-// Short cut version of ADinf(z), z>0 (from Marsaglia)
-// This returns the p-value for Anderson Darling statistic in
-// the limit as n-> infinity. For finite n, apply the error fix below.
-double AndersonDarlingInf(double z) {
-  if (z < 2) {
-    return exp(-1.2337141 / z) / sqrt(z) *
-           (2.00012 +
-            (0.247105 -
-             (0.0649821 - (0.0347962 - (0.011672 - 0.00168691 * z) * z) * z) *
-                 z) *
-                z);
-  }
-  return exp(
-      -exp(1.0776 -
-           (2.30695 -
-            (0.43424 - (0.082433 - (0.008056 - 0.0003146 * z) * z) * z) * z) *
-               z));
-}
-
-// Corrects the approximation error in AndersonDarlingInf for small values of n
-// Add this to AndersonDarlingInf to get a better approximation
-// (from Marsaglia)
-double AndersonDarlingErrFix(int n, double x) {
-  if (x > 0.8) {
-    return (-130.2137 +
-            (745.2337 -
-             (1705.091 - (1950.646 - (1116.360 - 255.7844 * x) * x) * x) * x) *
-                x) /
-           n;
-  }
-  double cutoff = 0.01265 + 0.1757 / n;
-  if (x < cutoff) {
-    double t = x / cutoff;
-    t = sqrt(t) * (1 - t) * (49 * t - 102);
-    return t * (0.0037 / (n * n) + 0.00078 / n + 0.00006) / n;
-  } else {
-    double t = (x - cutoff) / (0.8 - cutoff);
-    t = -0.00022633 +
-        (6.54034 - (14.6538 - (14.458 - (8.259 - 1.91864 * t) * t) * t) * t) *
-            t;
-    return t * (0.04213 + 0.01365 / n) / n;
-  }
-}
-
-// Returns the AndersonDarling p-value given n and the value of the statistic
-double AndersonDarlingPValue(int n, double z) {
-  double ad = AndersonDarlingInf(z);
-  double errfix = AndersonDarlingErrFix(n, ad);
-  return ad + errfix;
-}
-
-double AndersonDarlingStatistic(const std::vector<double>& random_sample) {
-  int n = random_sample.size();
-  double ad_sum = 0;
-  for (int i = 0; i < n; i++) {
-    ad_sum += (2 * i + 1) *
-              std::log(random_sample[i] * (1 - random_sample[n - 1 - i]));
-  }
-  double ad_statistic = -n - 1 / static_cast<double>(n) * ad_sum;
-  return ad_statistic;
-}
-
-// Tests if the array of doubles is uniformly distributed.
-// Returns the p-value of the Anderson Darling Statistic
-// for the given set of sorted random doubles
-// See "Evaluating the Anderson-Darling Distribution" by
-// Marsaglia and Marsaglia for details.
-double AndersonDarlingTest(const std::vector<double>& random_sample) {
-  double ad_statistic = AndersonDarlingStatistic(random_sample);
-  double p = AndersonDarlingPValue(random_sample.size(), ad_statistic);
-  return p;
-}
-
-TEST(ExponentialBiasedTest, CoinTossDemoWithGetSkipCount) {
-  ExponentialBiased eb;
-  for (int runs = 0; runs < 10; ++runs) {
-    for (int flips = eb.GetSkipCount(1); flips > 0; --flips) {
-      printf("head...");
-    }
-    printf("tail\n");
-  }
-  int heads = 0;
-  for (int i = 0; i < 10000000; i += 1 + eb.GetSkipCount(1)) {
-    ++heads;
-  }
-  printf("Heads = %d (%f%%)\n", heads, 100.0 * heads / 10000000);
-}
-
-TEST(ExponentialBiasedTest, SampleDemoWithStride) {
-  ExponentialBiased eb;
-  int stride = eb.GetStride(10);
-  int samples = 0;
-  for (int i = 0; i < 10000000; ++i) {
-    if (--stride == 0) {
-      ++samples;
-      stride = eb.GetStride(10);
-    }
-  }
-  printf("Samples = %d (%f%%)\n", samples, 100.0 * samples / 10000000);
-}
-
-
-// Testing that NextRandom generates uniform random numbers. Applies the
-// Anderson-Darling test for uniformity
-TEST(ExponentialBiasedTest, TestNextRandom) {
-  for (auto n : std::vector<int>({
-           10,  // Check short-range correlation
-           100, 1000,
-           10000  // Make sure there's no systemic error
-       })) {
-    uint64_t x = 1;
-    // This assumes that the prng returns 48 bit numbers
-    uint64_t max_prng_value = static_cast<uint64_t>(1) << 48;
-    // Initialize.
-    for (int i = 1; i <= 20; i++) {
-      x = ExponentialBiased::NextRandom(x);
-    }
-    std::vector<uint64_t> int_random_sample(n);
-    // Collect samples
-    for (int i = 0; i < n; i++) {
-      int_random_sample[i] = x;
-      x = ExponentialBiased::NextRandom(x);
-    }
-    // First sort them...
-    std::sort(int_random_sample.begin(), int_random_sample.end());
-    std::vector<double> random_sample(n);
-    // Convert them to uniform randoms (in the range [0,1])
-    for (int i = 0; i < n; i++) {
-      random_sample[i] =
-          static_cast<double>(int_random_sample[i]) / max_prng_value;
-    }
-    // Now compute the Anderson-Darling statistic
-    double ad_pvalue = AndersonDarlingTest(random_sample);
-    EXPECT_GT(std::min(ad_pvalue, 1 - ad_pvalue), 0.0001)
-        << "prng is not uniform: n = " << n << " p = " << ad_pvalue;
-  }
-}
-
-// The generator needs to be available as a thread_local and as a static
-// variable.
-TEST(ExponentialBiasedTest, InitializationModes) {
-  ABSL_CONST_INIT static ExponentialBiased eb_static;
-  EXPECT_THAT(eb_static.GetSkipCount(2), Ge(0));
-
-#ifdef ABSL_HAVE_THREAD_LOCAL
-  thread_local ExponentialBiased eb_thread;
-  EXPECT_THAT(eb_thread.GetSkipCount(2), Ge(0));
-#endif
-
-  ExponentialBiased eb_stack;
-  EXPECT_THAT(eb_stack.GetSkipCount(2), Ge(0));
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/fast_type_id.h b/third_party/abseil_cpp/absl/base/internal/fast_type_id.h
deleted file mode 100644
index 3db59e83745b..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/fast_type_id.h
+++ /dev/null
@@ -1,48 +0,0 @@
-//
-// Copyright 2020 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_BASE_INTERNAL_FAST_TYPE_ID_H_
-#define ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-template <typename Type>
-struct FastTypeTag {
-  constexpr static char dummy_var = 0;
-};
-
-template <typename Type>
-constexpr char FastTypeTag<Type>::dummy_var;
-
-// FastTypeId<Type>() evaluates at compile/link-time to a unique pointer for the
-// passed-in type. These are meant to be good match for keys into maps or
-// straight up comparisons.
-using FastTypeIdType = const void*;
-
-template <typename Type>
-constexpr inline FastTypeIdType FastTypeId() {
-  return &FastTypeTag<Type>::dummy_var;
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/fast_type_id_test.cc b/third_party/abseil_cpp/absl/base/internal/fast_type_id_test.cc
deleted file mode 100644
index 16f3c1458bdf..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/fast_type_id_test.cc
+++ /dev/null
@@ -1,123 +0,0 @@
-// Copyright 2020 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/base/internal/fast_type_id.h"
-
-#include <cstdint>
-#include <map>
-#include <vector>
-
-#include "gtest/gtest.h"
-
-namespace {
-namespace bi = absl::base_internal;
-
-// NOLINTNEXTLINE
-#define PRIM_TYPES(A)   \
-  A(bool)               \
-  A(short)              \
-  A(unsigned short)     \
-  A(int)                \
-  A(unsigned int)       \
-  A(long)               \
-  A(unsigned long)      \
-  A(long long)          \
-  A(unsigned long long) \
-  A(float)              \
-  A(double)             \
-  A(long double)
-
-TEST(FastTypeIdTest, PrimitiveTypes) {
-  bi::FastTypeIdType type_ids[] = {
-#define A(T) bi::FastTypeId<T>(),
-    PRIM_TYPES(A)
-#undef A
-#define A(T) bi::FastTypeId<const T>(),
-    PRIM_TYPES(A)
-#undef A
-#define A(T) bi::FastTypeId<volatile T>(),
-    PRIM_TYPES(A)
-#undef A
-#define A(T) bi::FastTypeId<const volatile T>(),
-    PRIM_TYPES(A)
-#undef A
-  };
-  size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
-
-  for (int i = 0; i < total_type_ids; ++i) {
-    EXPECT_EQ(type_ids[i], type_ids[i]);
-    for (int j = 0; j < i; ++j) {
-      EXPECT_NE(type_ids[i], type_ids[j]);
-    }
-  }
-}
-
-#define FIXED_WIDTH_TYPES(A) \
-  A(int8_t)                  \
-  A(uint8_t)                 \
-  A(int16_t)                 \
-  A(uint16_t)                \
-  A(int32_t)                 \
-  A(uint32_t)                \
-  A(int64_t)                 \
-  A(uint64_t)
-
-TEST(FastTypeIdTest, FixedWidthTypes) {
-  bi::FastTypeIdType type_ids[] = {
-#define A(T) bi::FastTypeId<T>(),
-    FIXED_WIDTH_TYPES(A)
-#undef A
-#define A(T) bi::FastTypeId<const T>(),
-    FIXED_WIDTH_TYPES(A)
-#undef A
-#define A(T) bi::FastTypeId<volatile T>(),
-    FIXED_WIDTH_TYPES(A)
-#undef A
-#define A(T) bi::FastTypeId<const volatile T>(),
-    FIXED_WIDTH_TYPES(A)
-#undef A
-  };
-  size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
-
-  for (int i = 0; i < total_type_ids; ++i) {
-    EXPECT_EQ(type_ids[i], type_ids[i]);
-    for (int j = 0; j < i; ++j) {
-      EXPECT_NE(type_ids[i], type_ids[j]);
-    }
-  }
-}
-
-TEST(FastTypeIdTest, AliasTypes) {
-  using int_alias = int;
-  EXPECT_EQ(bi::FastTypeId<int_alias>(), bi::FastTypeId<int>());
-}
-
-TEST(FastTypeIdTest, TemplateSpecializations) {
-  EXPECT_NE(bi::FastTypeId<std::vector<int>>(),
-            bi::FastTypeId<std::vector<long>>());
-
-  EXPECT_NE((bi::FastTypeId<std::map<int, float>>()),
-            (bi::FastTypeId<std::map<int, double>>()));
-}
-
-struct Base {};
-struct Derived : Base {};
-struct PDerived : private Base {};
-
-TEST(FastTypeIdTest, Inheritance) {
-  EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<Derived>());
-  EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<PDerived>());
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/hide_ptr.h b/third_party/abseil_cpp/absl/base/internal/hide_ptr.h
deleted file mode 100644
index 1dba80909a9b..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/hide_ptr.h
+++ /dev/null
@@ -1,51 +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_BASE_INTERNAL_HIDE_PTR_H_
-#define ABSL_BASE_INTERNAL_HIDE_PTR_H_
-
-#include <cstdint>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// Arbitrary value with high bits set. Xor'ing with it is unlikely
-// to map one valid pointer to another valid pointer.
-constexpr uintptr_t HideMask() {
-  return (uintptr_t{0xF03A5F7BU} << (sizeof(uintptr_t) - 4) * 8) | 0xF03A5F7BU;
-}
-
-// Hide a pointer from the leak checker. For internal use only.
-// Differs from absl::IgnoreLeak(ptr) in that absl::IgnoreLeak(ptr) causes ptr
-// and all objects reachable from ptr to be ignored by the leak checker.
-template <class T>
-inline uintptr_t HidePtr(T* ptr) {
-  return reinterpret_cast<uintptr_t>(ptr) ^ HideMask();
-}
-
-// Return a pointer that has been hidden from the leak checker.
-// For internal use only.
-template <class T>
-inline T* UnhidePtr(uintptr_t hidden) {
-  return reinterpret_cast<T*>(hidden ^ HideMask());
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_HIDE_PTR_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/identity.h b/third_party/abseil_cpp/absl/base/internal/identity.h
deleted file mode 100644
index a3154ed7bc59..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/identity.h
+++ /dev/null
@@ -1,37 +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_BASE_INTERNAL_IDENTITY_H_
-#define ABSL_BASE_INTERNAL_IDENTITY_H_
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace internal {
-
-template <typename T>
-struct identity {
-  typedef T type;
-};
-
-template <typename T>
-using identity_t = typename identity<T>::type;
-
-}  // namespace internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_IDENTITY_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/inline_variable.h b/third_party/abseil_cpp/absl/base/internal/inline_variable.h
deleted file mode 100644
index 130d8c2476dd..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/inline_variable.h
+++ /dev/null
@@ -1,107 +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_BASE_INTERNAL_INLINE_VARIABLE_EMULATION_H_
-#define ABSL_BASE_INTERNAL_INLINE_VARIABLE_EMULATION_H_
-
-#include <type_traits>
-
-#include "absl/base/internal/identity.h"
-
-// File:
-//   This file define a macro that allows the creation of or emulation of C++17
-//   inline variables based on whether or not the feature is supported.
-
-////////////////////////////////////////////////////////////////////////////////
-// Macro: ABSL_INTERNAL_INLINE_CONSTEXPR(type, name, init)
-//
-// Description:
-//   Expands to the equivalent of an inline constexpr instance of the specified
-//   `type` and `name`, initialized to the value `init`. If the compiler being
-//   used is detected as supporting actual inline variables as a language
-//   feature, then the macro expands to an actual inline variable definition.
-//
-// Requires:
-//   `type` is a type that is usable in an extern variable declaration.
-//
-// Requires: `name` is a valid identifier
-//
-// Requires:
-//   `init` is an expression that can be used in the following definition:
-//     constexpr type name = init;
-//
-// Usage:
-//
-//   // Equivalent to: `inline constexpr size_t variant_npos = -1;`
-//   ABSL_INTERNAL_INLINE_CONSTEXPR(size_t, variant_npos, -1);
-//
-// Differences in implementation:
-//   For a direct, language-level inline variable, decltype(name) will be the
-//   type that was specified along with const qualification, whereas for
-//   emulated inline variables, decltype(name) may be different (in practice
-//   it will likely be a reference type).
-////////////////////////////////////////////////////////////////////////////////
-
-#ifdef __cpp_inline_variables
-
-// Clang's -Wmissing-variable-declarations option erroneously warned that
-// inline constexpr objects need to be pre-declared. This has now been fixed,
-// but we will need to support this workaround for people building with older
-// versions of clang.
-//
-// Bug: https://bugs.llvm.org/show_bug.cgi?id=35862
-//
-// Note:
-//   identity_t is used here so that the const and name are in the
-//   appropriate place for pointer types, reference types, function pointer
-//   types, etc..
-#if defined(__clang__)
-#define ABSL_INTERNAL_EXTERN_DECL(type, name) \
-  extern const ::absl::internal::identity_t<type> name;
-#else  // Otherwise, just define the macro to do nothing.
-#define ABSL_INTERNAL_EXTERN_DECL(type, name)
-#endif  // defined(__clang__)
-
-// See above comment at top of file for details.
-#define ABSL_INTERNAL_INLINE_CONSTEXPR(type, name, init) \
-  ABSL_INTERNAL_EXTERN_DECL(type, name)                  \
-  inline constexpr ::absl::internal::identity_t<type> name = init
-
-#else
-
-// See above comment at top of file for details.
-//
-// Note:
-//   identity_t is used here so that the const and name are in the
-//   appropriate place for pointer types, reference types, function pointer
-//   types, etc..
-#define ABSL_INTERNAL_INLINE_CONSTEXPR(var_type, name, init)                  \
-  template <class /*AbslInternalDummy*/ = void>                               \
-  struct AbslInternalInlineVariableHolder##name {                             \
-    static constexpr ::absl::internal::identity_t<var_type> kInstance = init; \
-  };                                                                          \
-                                                                              \
-  template <class AbslInternalDummy>                                          \
-  constexpr ::absl::internal::identity_t<var_type>                            \
-      AbslInternalInlineVariableHolder##name<AbslInternalDummy>::kInstance;   \
-                                                                              \
-  static constexpr const ::absl::internal::identity_t<var_type>&              \
-      name = /* NOLINT */                                                     \
-      AbslInternalInlineVariableHolder##name<>::kInstance;                    \
-  static_assert(sizeof(void (*)(decltype(name))) != 0,                        \
-                "Silence unused variable warnings.")
-
-#endif  // __cpp_inline_variables
-
-#endif  // ABSL_BASE_INTERNAL_INLINE_VARIABLE_EMULATION_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/inline_variable_testing.h b/third_party/abseil_cpp/absl/base/internal/inline_variable_testing.h
deleted file mode 100644
index 3856b9f80f20..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/inline_variable_testing.h
+++ /dev/null
@@ -1,46 +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_BASE_INLINE_VARIABLE_TESTING_H_
-#define ABSL_BASE_INLINE_VARIABLE_TESTING_H_
-
-#include "absl/base/internal/inline_variable.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace inline_variable_testing_internal {
-
-struct Foo {
-  int value = 5;
-};
-
-ABSL_INTERNAL_INLINE_CONSTEXPR(Foo, inline_variable_foo, {});
-ABSL_INTERNAL_INLINE_CONSTEXPR(Foo, other_inline_variable_foo, {});
-
-ABSL_INTERNAL_INLINE_CONSTEXPR(int, inline_variable_int, 5);
-ABSL_INTERNAL_INLINE_CONSTEXPR(int, other_inline_variable_int, 5);
-
-ABSL_INTERNAL_INLINE_CONSTEXPR(void(*)(), inline_variable_fun_ptr, nullptr);
-
-const Foo& get_foo_a();
-const Foo& get_foo_b();
-
-const int& get_int_a();
-const int& get_int_b();
-
-}  // namespace inline_variable_testing_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INLINE_VARIABLE_TESTING_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/invoke.h b/third_party/abseil_cpp/absl/base/internal/invoke.h
deleted file mode 100644
index 5c71f328234f..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/invoke.h
+++ /dev/null
@@ -1,187 +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.
-//
-// absl::base_internal::invoke(f, args...) is an implementation of
-// INVOKE(f, args...) from section [func.require] of the C++ standard.
-//
-// [func.require]
-// Define INVOKE (f, t1, t2, ..., tN) as follows:
-// 1. (t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T
-//    and t1 is an object of type T or a reference to an object of type T or a
-//    reference to an object of a type derived from T;
-// 2. ((*t1).*f)(t2, ..., tN) when f is a pointer to a member function of a
-//    class T and t1 is not one of the types described in the previous item;
-// 3. t1.*f when N == 1 and f is a pointer to member data of a class T and t1 is
-//    an object of type T or a reference to an object of type T or a reference
-//    to an object of a type derived from T;
-// 4. (*t1).*f when N == 1 and f is a pointer to member data of a class T and t1
-//    is not one of the types described in the previous item;
-// 5. f(t1, t2, ..., tN) in all other cases.
-//
-// The implementation is SFINAE-friendly: substitution failure within invoke()
-// isn't an error.
-
-#ifndef ABSL_BASE_INTERNAL_INVOKE_H_
-#define ABSL_BASE_INTERNAL_INVOKE_H_
-
-#include <algorithm>
-#include <type_traits>
-#include <utility>
-
-#include "absl/meta/type_traits.h"
-
-// The following code is internal implementation detail.  See the comment at the
-// top of this file for the API documentation.
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// The five classes below each implement one of the clauses from the definition
-// of INVOKE. The inner class template Accept<F, Args...> checks whether the
-// clause is applicable; static function template Invoke(f, args...) does the
-// invocation.
-//
-// By separating the clause selection logic from invocation we make sure that
-// Invoke() does exactly what the standard says.
-
-template <typename Derived>
-struct StrippedAccept {
-  template <typename... Args>
-  struct Accept : Derived::template AcceptImpl<typename std::remove_cv<
-                      typename std::remove_reference<Args>::type>::type...> {};
-};
-
-// (t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T
-// and t1 is an object of type T or a reference to an object of type T or a
-// reference to an object of a type derived from T.
-struct MemFunAndRef : StrippedAccept<MemFunAndRef> {
-  template <typename... Args>
-  struct AcceptImpl : std::false_type {};
-
-  template <typename MemFunType, typename C, typename Obj, typename... Args>
-  struct AcceptImpl<MemFunType C::*, Obj, Args...>
-      : std::integral_constant<bool, std::is_base_of<C, Obj>::value &&
-                                         absl::is_function<MemFunType>::value> {
-  };
-
-  template <typename MemFun, typename Obj, typename... Args>
-  static decltype((std::declval<Obj>().*
-                   std::declval<MemFun>())(std::declval<Args>()...))
-  Invoke(MemFun&& mem_fun, Obj&& obj, Args&&... args) {
-    return (std::forward<Obj>(obj).*
-            std::forward<MemFun>(mem_fun))(std::forward<Args>(args)...);
-  }
-};
-
-// ((*t1).*f)(t2, ..., tN) when f is a pointer to a member function of a
-// class T and t1 is not one of the types described in the previous item.
-struct MemFunAndPtr : StrippedAccept<MemFunAndPtr> {
-  template <typename... Args>
-  struct AcceptImpl : std::false_type {};
-
-  template <typename MemFunType, typename C, typename Ptr, typename... Args>
-  struct AcceptImpl<MemFunType C::*, Ptr, Args...>
-      : std::integral_constant<bool, !std::is_base_of<C, Ptr>::value &&
-                                         absl::is_function<MemFunType>::value> {
-  };
-
-  template <typename MemFun, typename Ptr, typename... Args>
-  static decltype(((*std::declval<Ptr>()).*
-                   std::declval<MemFun>())(std::declval<Args>()...))
-  Invoke(MemFun&& mem_fun, Ptr&& ptr, Args&&... args) {
-    return ((*std::forward<Ptr>(ptr)).*
-            std::forward<MemFun>(mem_fun))(std::forward<Args>(args)...);
-  }
-};
-
-// t1.*f when N == 1 and f is a pointer to member data of a class T and t1 is
-// an object of type T or a reference to an object of type T or a reference
-// to an object of a type derived from T.
-struct DataMemAndRef : StrippedAccept<DataMemAndRef> {
-  template <typename... Args>
-  struct AcceptImpl : std::false_type {};
-
-  template <typename R, typename C, typename Obj>
-  struct AcceptImpl<R C::*, Obj>
-      : std::integral_constant<bool, std::is_base_of<C, Obj>::value &&
-                                         !absl::is_function<R>::value> {};
-
-  template <typename DataMem, typename Ref>
-  static decltype(std::declval<Ref>().*std::declval<DataMem>()) Invoke(
-      DataMem&& data_mem, Ref&& ref) {
-    return std::forward<Ref>(ref).*std::forward<DataMem>(data_mem);
-  }
-};
-
-// (*t1).*f when N == 1 and f is a pointer to member data of a class T and t1
-// is not one of the types described in the previous item.
-struct DataMemAndPtr : StrippedAccept<DataMemAndPtr> {
-  template <typename... Args>
-  struct AcceptImpl : std::false_type {};
-
-  template <typename R, typename C, typename Ptr>
-  struct AcceptImpl<R C::*, Ptr>
-      : std::integral_constant<bool, !std::is_base_of<C, Ptr>::value &&
-                                         !absl::is_function<R>::value> {};
-
-  template <typename DataMem, typename Ptr>
-  static decltype((*std::declval<Ptr>()).*std::declval<DataMem>()) Invoke(
-      DataMem&& data_mem, Ptr&& ptr) {
-    return (*std::forward<Ptr>(ptr)).*std::forward<DataMem>(data_mem);
-  }
-};
-
-// f(t1, t2, ..., tN) in all other cases.
-struct Callable {
-  // Callable doesn't have Accept because it's the last clause that gets picked
-  // when none of the previous clauses are applicable.
-  template <typename F, typename... Args>
-  static decltype(std::declval<F>()(std::declval<Args>()...)) Invoke(
-      F&& f, Args&&... args) {
-    return std::forward<F>(f)(std::forward<Args>(args)...);
-  }
-};
-
-// Resolves to the first matching clause.
-template <typename... Args>
-struct Invoker {
-  typedef typename std::conditional<
-      MemFunAndRef::Accept<Args...>::value, MemFunAndRef,
-      typename std::conditional<
-          MemFunAndPtr::Accept<Args...>::value, MemFunAndPtr,
-          typename std::conditional<
-              DataMemAndRef::Accept<Args...>::value, DataMemAndRef,
-              typename std::conditional<DataMemAndPtr::Accept<Args...>::value,
-                                        DataMemAndPtr, Callable>::type>::type>::
-          type>::type type;
-};
-
-// The result type of Invoke<F, Args...>.
-template <typename F, typename... Args>
-using invoke_result_t = decltype(Invoker<F, Args...>::type::Invoke(
-    std::declval<F>(), std::declval<Args>()...));
-
-// Invoke(f, args...) is an implementation of INVOKE(f, args...) from section
-// [func.require] of the C++ standard.
-template <typename F, typename... Args>
-invoke_result_t<F, Args...> invoke(F&& f, Args&&... args) {
-  return Invoker<F, Args...>::type::Invoke(std::forward<F>(f),
-                                           std::forward<Args>(args)...);
-}
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_INVOKE_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc b/third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc
deleted file mode 100644
index 229ab9162d12..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc
+++ /dev/null
@@ -1,620 +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.
-
-// A low-level allocator that can be used by other low-level
-// modules without introducing dependency cycles.
-// This allocator is slow and wasteful of memory;
-// it should not be used when performance is key.
-
-#include "absl/base/internal/low_level_alloc.h"
-
-#include <type_traits>
-
-#include "absl/base/call_once.h"
-#include "absl/base/config.h"
-#include "absl/base/internal/direct_mmap.h"
-#include "absl/base/internal/scheduling_mode.h"
-#include "absl/base/macros.h"
-#include "absl/base/thread_annotations.h"
-
-// LowLevelAlloc requires that the platform support low-level
-// allocation of virtual memory. Platforms lacking this cannot use
-// LowLevelAlloc.
-#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING
-
-#ifndef _WIN32
-#include <pthread.h>
-#include <signal.h>
-#include <sys/mman.h>
-#include <unistd.h>
-#else
-#include <windows.h>
-#endif
-
-#include <string.h>
-#include <algorithm>
-#include <atomic>
-#include <cerrno>
-#include <cstddef>
-#include <new>                   // for placement-new
-
-#include "absl/base/dynamic_annotations.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/spinlock.h"
-
-// MAP_ANONYMOUS
-#if defined(__APPLE__)
-// For mmap, Linux defines both MAP_ANONYMOUS and MAP_ANON and says MAP_ANON is
-// deprecated. In Darwin, MAP_ANON is all there is.
-#if !defined MAP_ANONYMOUS
-#define MAP_ANONYMOUS MAP_ANON
-#endif  // !MAP_ANONYMOUS
-#endif  // __APPLE__
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// A first-fit allocator with amortized logarithmic free() time.
-
-// ---------------------------------------------------------------------------
-static const int kMaxLevel = 30;
-
-namespace {
-// This struct describes one allocated block, or one free block.
-struct AllocList {
-  struct Header {
-    // Size of entire region, including this field. Must be
-    // first. Valid in both allocated and unallocated blocks.
-    uintptr_t size;
-
-    // kMagicAllocated or kMagicUnallocated xor this.
-    uintptr_t magic;
-
-    // Pointer to parent arena.
-    LowLevelAlloc::Arena *arena;
-
-    // Aligns regions to 0 mod 2*sizeof(void*).
-    void *dummy_for_alignment;
-  } header;
-
-  // Next two fields: in unallocated blocks: freelist skiplist data
-  //                  in allocated blocks: overlaps with client data
-
-  // Levels in skiplist used.
-  int levels;
-
-  // Actually has levels elements. The AllocList node may not have room
-  // for all kMaxLevel entries. See max_fit in LLA_SkiplistLevels().
-  AllocList *next[kMaxLevel];
-};
-}  // namespace
-
-// ---------------------------------------------------------------------------
-// A trivial skiplist implementation.  This is used to keep the freelist
-// in address order while taking only logarithmic time per insert and delete.
-
-// An integer approximation of log2(size/base)
-// Requires size >= base.
-static int IntLog2(size_t size, size_t base) {
-  int result = 0;
-  for (size_t i = size; i > base; i >>= 1) {  // i == floor(size/2**result)
-    result++;
-  }
-  //    floor(size / 2**result) <= base < floor(size / 2**(result-1))
-  // =>     log2(size/(base+1)) <= result < 1+log2(size/base)
-  // => result ~= log2(size/base)
-  return result;
-}
-
-// Return a random integer n:  p(n)=1/(2**n) if 1 <= n; p(n)=0 if n < 1.
-static int Random(uint32_t *state) {
-  uint32_t r = *state;
-  int result = 1;
-  while ((((r = r*1103515245 + 12345) >> 30) & 1) == 0) {
-    result++;
-  }
-  *state = r;
-  return result;
-}
-
-// Return a number of skiplist levels for a node of size bytes, where
-// base is the minimum node size.  Compute level=log2(size / base)+n
-// where n is 1 if random is false and otherwise a random number generated with
-// the standard distribution for a skiplist:  See Random() above.
-// Bigger nodes tend to have more skiplist levels due to the log2(size / base)
-// term, so first-fit searches touch fewer nodes.  "level" is clipped so
-// level<kMaxLevel and next[level-1] will fit in the node.
-// 0 < LLA_SkiplistLevels(x,y,false) <= LLA_SkiplistLevels(x,y,true) < kMaxLevel
-static int LLA_SkiplistLevels(size_t size, size_t base, uint32_t *random) {
-  // max_fit is the maximum number of levels that will fit in a node for the
-  // given size.   We can't return more than max_fit, no matter what the
-  // random number generator says.
-  size_t max_fit = (size - offsetof(AllocList, next)) / sizeof(AllocList *);
-  int level = IntLog2(size, base) + (random != nullptr ? Random(random) : 1);
-  if (static_cast<size_t>(level) > max_fit) level = static_cast<int>(max_fit);
-  if (level > kMaxLevel-1) level = kMaxLevel - 1;
-  ABSL_RAW_CHECK(level >= 1, "block not big enough for even one level");
-  return level;
-}
-
-// Return "atleast", the first element of AllocList *head s.t. *atleast >= *e.
-// For 0 <= i < head->levels, set prev[i] to "no_greater", where no_greater
-// points to the last element at level i in the AllocList less than *e, or is
-// head if no such element exists.
-static AllocList *LLA_SkiplistSearch(AllocList *head,
-                                     AllocList *e, AllocList **prev) {
-  AllocList *p = head;
-  for (int level = head->levels - 1; level >= 0; level--) {
-    for (AllocList *n; (n = p->next[level]) != nullptr && n < e; p = n) {
-    }
-    prev[level] = p;
-  }
-  return (head->levels == 0) ? nullptr : prev[0]->next[0];
-}
-
-// Insert element *e into AllocList *head.  Set prev[] as LLA_SkiplistSearch.
-// Requires that e->levels be previously set by the caller (using
-// LLA_SkiplistLevels())
-static void LLA_SkiplistInsert(AllocList *head, AllocList *e,
-                               AllocList **prev) {
-  LLA_SkiplistSearch(head, e, prev);
-  for (; head->levels < e->levels; head->levels++) {  // extend prev pointers
-    prev[head->levels] = head;                        // to all *e's levels
-  }
-  for (int i = 0; i != e->levels; i++) {  // add element to list
-    e->next[i] = prev[i]->next[i];
-    prev[i]->next[i] = e;
-  }
-}
-
-// Remove element *e from AllocList *head.  Set prev[] as LLA_SkiplistSearch().
-// Requires that e->levels be previous set by the caller (using
-// LLA_SkiplistLevels())
-static void LLA_SkiplistDelete(AllocList *head, AllocList *e,
-                               AllocList **prev) {
-  AllocList *found = LLA_SkiplistSearch(head, e, prev);
-  ABSL_RAW_CHECK(e == found, "element not in freelist");
-  for (int i = 0; i != e->levels && prev[i]->next[i] == e; i++) {
-    prev[i]->next[i] = e->next[i];
-  }
-  while (head->levels > 0 && head->next[head->levels - 1] == nullptr) {
-    head->levels--;   // reduce head->levels if level unused
-  }
-}
-
-// ---------------------------------------------------------------------------
-// Arena implementation
-
-// Metadata for an LowLevelAlloc arena instance.
-struct LowLevelAlloc::Arena {
-  // Constructs an arena with the given LowLevelAlloc flags.
-  explicit Arena(uint32_t flags_value);
-
-  base_internal::SpinLock mu;
-  // Head of free list, sorted by address
-  AllocList freelist ABSL_GUARDED_BY(mu);
-  // Count of allocated blocks
-  int32_t allocation_count ABSL_GUARDED_BY(mu);
-  // flags passed to NewArena
-  const uint32_t flags;
-  // Result of sysconf(_SC_PAGESIZE)
-  const size_t pagesize;
-  // Lowest power of two >= max(16, sizeof(AllocList))
-  const size_t round_up;
-  // Smallest allocation block size
-  const size_t min_size;
-  // PRNG state
-  uint32_t random ABSL_GUARDED_BY(mu);
-};
-
-namespace {
-// Static storage space for the lazily-constructed, default global arena
-// instances.  We require this space because the whole point of LowLevelAlloc
-// is to avoid relying on malloc/new.
-alignas(LowLevelAlloc::Arena) unsigned char default_arena_storage[sizeof(
-    LowLevelAlloc::Arena)];
-alignas(LowLevelAlloc::Arena) unsigned char unhooked_arena_storage[sizeof(
-    LowLevelAlloc::Arena)];
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-alignas(
-    LowLevelAlloc::Arena) unsigned char unhooked_async_sig_safe_arena_storage
-    [sizeof(LowLevelAlloc::Arena)];
-#endif
-
-// We must use LowLevelCallOnce here to construct the global arenas, rather than
-// using function-level statics, to avoid recursively invoking the scheduler.
-absl::once_flag create_globals_once;
-
-void CreateGlobalArenas() {
-  new (&default_arena_storage)
-      LowLevelAlloc::Arena(LowLevelAlloc::kCallMallocHook);
-  new (&unhooked_arena_storage) LowLevelAlloc::Arena(0);
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-  new (&unhooked_async_sig_safe_arena_storage)
-      LowLevelAlloc::Arena(LowLevelAlloc::kAsyncSignalSafe);
-#endif
-}
-
-// Returns a global arena that does not call into hooks.  Used by NewArena()
-// when kCallMallocHook is not set.
-LowLevelAlloc::Arena* UnhookedArena() {
-  base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
-  return reinterpret_cast<LowLevelAlloc::Arena*>(&unhooked_arena_storage);
-}
-
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-// Returns a global arena that is async-signal safe.  Used by NewArena() when
-// kAsyncSignalSafe is set.
-LowLevelAlloc::Arena *UnhookedAsyncSigSafeArena() {
-  base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
-  return reinterpret_cast<LowLevelAlloc::Arena *>(
-      &unhooked_async_sig_safe_arena_storage);
-}
-#endif
-
-}  // namespace
-
-// Returns the default arena, as used by LowLevelAlloc::Alloc() and friends.
-LowLevelAlloc::Arena *LowLevelAlloc::DefaultArena() {
-  base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
-  return reinterpret_cast<LowLevelAlloc::Arena*>(&default_arena_storage);
-}
-
-// magic numbers to identify allocated and unallocated blocks
-static const uintptr_t kMagicAllocated = 0x4c833e95U;
-static const uintptr_t kMagicUnallocated = ~kMagicAllocated;
-
-namespace {
-class ABSL_SCOPED_LOCKABLE ArenaLock {
- public:
-  explicit ArenaLock(LowLevelAlloc::Arena *arena)
-      ABSL_EXCLUSIVE_LOCK_FUNCTION(arena->mu)
-      : arena_(arena) {
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-    if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
-      sigset_t all;
-      sigfillset(&all);
-      mask_valid_ = pthread_sigmask(SIG_BLOCK, &all, &mask_) == 0;
-    }
-#endif
-    arena_->mu.Lock();
-  }
-  ~ArenaLock() { ABSL_RAW_CHECK(left_, "haven't left Arena region"); }
-  void Leave() ABSL_UNLOCK_FUNCTION() {
-    arena_->mu.Unlock();
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-    if (mask_valid_) {
-      const int err = pthread_sigmask(SIG_SETMASK, &mask_, nullptr);
-      if (err != 0) {
-        ABSL_RAW_LOG(FATAL, "pthread_sigmask failed: %d", err);
-      }
-    }
-#endif
-    left_ = true;
-  }
-
- private:
-  bool left_ = false;  // whether left region
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-  bool mask_valid_ = false;
-  sigset_t mask_;  // old mask of blocked signals
-#endif
-  LowLevelAlloc::Arena *arena_;
-  ArenaLock(const ArenaLock &) = delete;
-  ArenaLock &operator=(const ArenaLock &) = delete;
-};
-}  // namespace
-
-// create an appropriate magic number for an object at "ptr"
-// "magic" should be kMagicAllocated or kMagicUnallocated
-inline static uintptr_t Magic(uintptr_t magic, AllocList::Header *ptr) {
-  return magic ^ reinterpret_cast<uintptr_t>(ptr);
-}
-
-namespace {
-size_t GetPageSize() {
-#ifdef _WIN32
-  SYSTEM_INFO system_info;
-  GetSystemInfo(&system_info);
-  return std::max(system_info.dwPageSize, system_info.dwAllocationGranularity);
-#elif defined(__wasm__) || defined(__asmjs__)
-  return getpagesize();
-#else
-  return sysconf(_SC_PAGESIZE);
-#endif
-}
-
-size_t RoundedUpBlockSize() {
-  // Round up block sizes to a power of two close to the header size.
-  size_t round_up = 16;
-  while (round_up < sizeof(AllocList::Header)) {
-    round_up += round_up;
-  }
-  return round_up;
-}
-
-}  // namespace
-
-LowLevelAlloc::Arena::Arena(uint32_t flags_value)
-    : mu(base_internal::SCHEDULE_KERNEL_ONLY),
-      allocation_count(0),
-      flags(flags_value),
-      pagesize(GetPageSize()),
-      round_up(RoundedUpBlockSize()),
-      min_size(2 * round_up),
-      random(0) {
-  freelist.header.size = 0;
-  freelist.header.magic =
-      Magic(kMagicUnallocated, &freelist.header);
-  freelist.header.arena = this;
-  freelist.levels = 0;
-  memset(freelist.next, 0, sizeof(freelist.next));
-}
-
-// L < meta_data_arena->mu
-LowLevelAlloc::Arena *LowLevelAlloc::NewArena(int32_t flags) {
-  Arena *meta_data_arena = DefaultArena();
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-  if ((flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
-    meta_data_arena = UnhookedAsyncSigSafeArena();
-  } else  // NOLINT(readability/braces)
-#endif
-      if ((flags & LowLevelAlloc::kCallMallocHook) == 0) {
-    meta_data_arena = UnhookedArena();
-  }
-  Arena *result =
-    new (AllocWithArena(sizeof (*result), meta_data_arena)) Arena(flags);
-  return result;
-}
-
-// L < arena->mu, L < arena->arena->mu
-bool LowLevelAlloc::DeleteArena(Arena *arena) {
-  ABSL_RAW_CHECK(
-      arena != nullptr && arena != DefaultArena() && arena != UnhookedArena(),
-      "may not delete default arena");
-  ArenaLock section(arena);
-  if (arena->allocation_count != 0) {
-    section.Leave();
-    return false;
-  }
-  while (arena->freelist.next[0] != nullptr) {
-    AllocList *region = arena->freelist.next[0];
-    size_t size = region->header.size;
-    arena->freelist.next[0] = region->next[0];
-    ABSL_RAW_CHECK(
-        region->header.magic == Magic(kMagicUnallocated, &region->header),
-        "bad magic number in DeleteArena()");
-    ABSL_RAW_CHECK(region->header.arena == arena,
-                   "bad arena pointer in DeleteArena()");
-    ABSL_RAW_CHECK(size % arena->pagesize == 0,
-                   "empty arena has non-page-aligned block size");
-    ABSL_RAW_CHECK(reinterpret_cast<uintptr_t>(region) % arena->pagesize == 0,
-                   "empty arena has non-page-aligned block");
-    int munmap_result;
-#ifdef _WIN32
-    munmap_result = VirtualFree(region, 0, MEM_RELEASE);
-    ABSL_RAW_CHECK(munmap_result != 0,
-                   "LowLevelAlloc::DeleteArena: VitualFree failed");
-#else
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-    if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) == 0) {
-      munmap_result = munmap(region, size);
-    } else {
-      munmap_result = base_internal::DirectMunmap(region, size);
-    }
-#else
-    munmap_result = munmap(region, size);
-#endif  // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-    if (munmap_result != 0) {
-      ABSL_RAW_LOG(FATAL, "LowLevelAlloc::DeleteArena: munmap failed: %d",
-                   errno);
-    }
-#endif  // _WIN32
-  }
-  section.Leave();
-  arena->~Arena();
-  Free(arena);
-  return true;
-}
-
-// ---------------------------------------------------------------------------
-
-// Addition, checking for overflow.  The intent is to die if an external client
-// manages to push through a request that would cause arithmetic to fail.
-static inline uintptr_t CheckedAdd(uintptr_t a, uintptr_t b) {
-  uintptr_t sum = a + b;
-  ABSL_RAW_CHECK(sum >= a, "LowLevelAlloc arithmetic overflow");
-  return sum;
-}
-
-// Return value rounded up to next multiple of align.
-// align must be a power of two.
-static inline uintptr_t RoundUp(uintptr_t addr, uintptr_t align) {
-  return CheckedAdd(addr, align - 1) & ~(align - 1);
-}
-
-// Equivalent to "return prev->next[i]" but with sanity checking
-// that the freelist is in the correct order, that it
-// consists of regions marked "unallocated", and that no two regions
-// are adjacent in memory (they should have been coalesced).
-// L >= arena->mu
-static AllocList *Next(int i, AllocList *prev, LowLevelAlloc::Arena *arena) {
-  ABSL_RAW_CHECK(i < prev->levels, "too few levels in Next()");
-  AllocList *next = prev->next[i];
-  if (next != nullptr) {
-    ABSL_RAW_CHECK(
-        next->header.magic == Magic(kMagicUnallocated, &next->header),
-        "bad magic number in Next()");
-    ABSL_RAW_CHECK(next->header.arena == arena, "bad arena pointer in Next()");
-    if (prev != &arena->freelist) {
-      ABSL_RAW_CHECK(prev < next, "unordered freelist");
-      ABSL_RAW_CHECK(reinterpret_cast<char *>(prev) + prev->header.size <
-                         reinterpret_cast<char *>(next),
-                     "malformed freelist");
-    }
-  }
-  return next;
-}
-
-// Coalesce list item "a" with its successor if they are adjacent.
-static void Coalesce(AllocList *a) {
-  AllocList *n = a->next[0];
-  if (n != nullptr && reinterpret_cast<char *>(a) + a->header.size ==
-                          reinterpret_cast<char *>(n)) {
-    LowLevelAlloc::Arena *arena = a->header.arena;
-    a->header.size += n->header.size;
-    n->header.magic = 0;
-    n->header.arena = nullptr;
-    AllocList *prev[kMaxLevel];
-    LLA_SkiplistDelete(&arena->freelist, n, prev);
-    LLA_SkiplistDelete(&arena->freelist, a, prev);
-    a->levels = LLA_SkiplistLevels(a->header.size, arena->min_size,
-                                   &arena->random);
-    LLA_SkiplistInsert(&arena->freelist, a, prev);
-  }
-}
-
-// Adds block at location "v" to the free list
-// L >= arena->mu
-static void AddToFreelist(void *v, LowLevelAlloc::Arena *arena) {
-  AllocList *f = reinterpret_cast<AllocList *>(
-                        reinterpret_cast<char *>(v) - sizeof (f->header));
-  ABSL_RAW_CHECK(f->header.magic == Magic(kMagicAllocated, &f->header),
-                 "bad magic number in AddToFreelist()");
-  ABSL_RAW_CHECK(f->header.arena == arena,
-                 "bad arena pointer in AddToFreelist()");
-  f->levels = LLA_SkiplistLevels(f->header.size, arena->min_size,
-                                 &arena->random);
-  AllocList *prev[kMaxLevel];
-  LLA_SkiplistInsert(&arena->freelist, f, prev);
-  f->header.magic = Magic(kMagicUnallocated, &f->header);
-  Coalesce(f);                  // maybe coalesce with successor
-  Coalesce(prev[0]);            // maybe coalesce with predecessor
-}
-
-// Frees storage allocated by LowLevelAlloc::Alloc().
-// L < arena->mu
-void LowLevelAlloc::Free(void *v) {
-  if (v != nullptr) {
-    AllocList *f = reinterpret_cast<AllocList *>(
-                        reinterpret_cast<char *>(v) - sizeof (f->header));
-    LowLevelAlloc::Arena *arena = f->header.arena;
-    ArenaLock section(arena);
-    AddToFreelist(v, arena);
-    ABSL_RAW_CHECK(arena->allocation_count > 0, "nothing in arena to free");
-    arena->allocation_count--;
-    section.Leave();
-  }
-}
-
-// allocates and returns a block of size bytes, to be freed with Free()
-// L < arena->mu
-static void *DoAllocWithArena(size_t request, LowLevelAlloc::Arena *arena) {
-  void *result = nullptr;
-  if (request != 0) {
-    AllocList *s;       // will point to region that satisfies request
-    ArenaLock section(arena);
-    // round up with header
-    size_t req_rnd = RoundUp(CheckedAdd(request, sizeof (s->header)),
-                             arena->round_up);
-    for (;;) {      // loop until we find a suitable region
-      // find the minimum levels that a block of this size must have
-      int i = LLA_SkiplistLevels(req_rnd, arena->min_size, nullptr) - 1;
-      if (i < arena->freelist.levels) {   // potential blocks exist
-        AllocList *before = &arena->freelist;  // predecessor of s
-        while ((s = Next(i, before, arena)) != nullptr &&
-               s->header.size < req_rnd) {
-          before = s;
-        }
-        if (s != nullptr) {       // we found a region
-          break;
-        }
-      }
-      // we unlock before mmap() both because mmap() may call a callback hook,
-      // and because it may be slow.
-      arena->mu.Unlock();
-      // mmap generous 64K chunks to decrease
-      // the chances/impact of fragmentation:
-      size_t new_pages_size = RoundUp(req_rnd, arena->pagesize * 16);
-      void *new_pages;
-#ifdef _WIN32
-      new_pages = VirtualAlloc(0, new_pages_size,
-                               MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
-      ABSL_RAW_CHECK(new_pages != nullptr, "VirtualAlloc failed");
-#else
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-      if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
-        new_pages = base_internal::DirectMmap(nullptr, new_pages_size,
-            PROT_WRITE|PROT_READ, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
-      } else {
-        new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ,
-                         MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
-      }
-#else
-      new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ,
-                       MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
-#endif  // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-      if (new_pages == MAP_FAILED) {
-        ABSL_RAW_LOG(FATAL, "mmap error: %d", errno);
-      }
-
-#endif  // _WIN32
-      arena->mu.Lock();
-      s = reinterpret_cast<AllocList *>(new_pages);
-      s->header.size = new_pages_size;
-      // Pretend the block is allocated; call AddToFreelist() to free it.
-      s->header.magic = Magic(kMagicAllocated, &s->header);
-      s->header.arena = arena;
-      AddToFreelist(&s->levels, arena);  // insert new region into free list
-    }
-    AllocList *prev[kMaxLevel];
-    LLA_SkiplistDelete(&arena->freelist, s, prev);    // remove from free list
-    // s points to the first free region that's big enough
-    if (CheckedAdd(req_rnd, arena->min_size) <= s->header.size) {
-      // big enough to split
-      AllocList *n = reinterpret_cast<AllocList *>
-                        (req_rnd + reinterpret_cast<char *>(s));
-      n->header.size = s->header.size - req_rnd;
-      n->header.magic = Magic(kMagicAllocated, &n->header);
-      n->header.arena = arena;
-      s->header.size = req_rnd;
-      AddToFreelist(&n->levels, arena);
-    }
-    s->header.magic = Magic(kMagicAllocated, &s->header);
-    ABSL_RAW_CHECK(s->header.arena == arena, "");
-    arena->allocation_count++;
-    section.Leave();
-    result = &s->levels;
-  }
-  ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(result, request);
-  return result;
-}
-
-void *LowLevelAlloc::Alloc(size_t request) {
-  void *result = DoAllocWithArena(request, DefaultArena());
-  return result;
-}
-
-void *LowLevelAlloc::AllocWithArena(size_t request, Arena *arena) {
-  ABSL_RAW_CHECK(arena != nullptr, "must pass a valid arena");
-  void *result = DoAllocWithArena(request, arena);
-  return result;
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_LOW_LEVEL_ALLOC_MISSING
diff --git a/third_party/abseil_cpp/absl/base/internal/low_level_alloc.h b/third_party/abseil_cpp/absl/base/internal/low_level_alloc.h
deleted file mode 100644
index db91951c825f..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/low_level_alloc.h
+++ /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.
-//
-
-#ifndef ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
-#define ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
-
-// A simple thread-safe memory allocator that does not depend on
-// mutexes or thread-specific data.  It is intended to be used
-// sparingly, and only when malloc() would introduce an unwanted
-// dependency, such as inside the heap-checker, or the Mutex
-// implementation.
-
-// IWYU pragma: private, include "base/low_level_alloc.h"
-
-#include <sys/types.h>
-
-#include <cstdint>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-
-// LowLevelAlloc requires that the platform support low-level
-// allocation of virtual memory. Platforms lacking this cannot use
-// LowLevelAlloc.
-#ifdef ABSL_LOW_LEVEL_ALLOC_MISSING
-#error ABSL_LOW_LEVEL_ALLOC_MISSING cannot be directly set
-#elif !defined(ABSL_HAVE_MMAP) && !defined(_WIN32)
-#define ABSL_LOW_LEVEL_ALLOC_MISSING 1
-#endif
-
-// Using LowLevelAlloc with kAsyncSignalSafe isn't supported on Windows or
-// asm.js / WebAssembly.
-// See https://kripken.github.io/emscripten-site/docs/porting/pthreads.html
-// for more information.
-#ifdef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-#error ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING cannot be directly set
-#elif defined(_WIN32) || defined(__asmjs__) || defined(__wasm__)
-#define ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING 1
-#endif
-
-#include <cstddef>
-
-#include "absl/base/port.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-class LowLevelAlloc {
- public:
-  struct Arena;       // an arena from which memory may be allocated
-
-  // Returns a pointer to a block of at least "request" bytes
-  // that have been newly allocated from the specific arena.
-  // for Alloc() call the DefaultArena() is used.
-  // Returns 0 if passed request==0.
-  // Does not return 0 under other circumstances; it crashes if memory
-  // is not available.
-  static void *Alloc(size_t request) ABSL_ATTRIBUTE_SECTION(malloc_hook);
-  static void *AllocWithArena(size_t request, Arena *arena)
-      ABSL_ATTRIBUTE_SECTION(malloc_hook);
-
-  // Deallocates a region of memory that was previously allocated with
-  // Alloc().   Does nothing if passed 0.   "s" must be either 0,
-  // or must have been returned from a call to Alloc() and not yet passed to
-  // Free() since that call to Alloc().  The space is returned to the arena
-  // from which it was allocated.
-  static void Free(void *s) ABSL_ATTRIBUTE_SECTION(malloc_hook);
-
-  // ABSL_ATTRIBUTE_SECTION(malloc_hook) for Alloc* and Free
-  // are to put all callers of MallocHook::Invoke* in this module
-  // into special section,
-  // so that MallocHook::GetCallerStackTrace can function accurately.
-
-  // Create a new arena.
-  // The root metadata for the new arena is allocated in the
-  // meta_data_arena; the DefaultArena() can be passed for meta_data_arena.
-  // These values may be ored into flags:
-  enum {
-    // Report calls to Alloc() and Free() via the MallocHook interface.
-    // Set in the DefaultArena.
-    kCallMallocHook = 0x0001,
-
-#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-    // Make calls to Alloc(), Free() be async-signal-safe. Not set in
-    // DefaultArena(). Not supported on all platforms.
-    kAsyncSignalSafe = 0x0002,
-#endif
-  };
-  // Construct a new arena.  The allocation of the underlying metadata honors
-  // the provided flags.  For example, the call NewArena(kAsyncSignalSafe)
-  // is itself async-signal-safe, as well as generatating an arena that provides
-  // async-signal-safe Alloc/Free.
-  static Arena *NewArena(int32_t flags);
-
-  // Destroys an arena allocated by NewArena and returns true,
-  // provided no allocated blocks remain in the arena.
-  // If allocated blocks remain in the arena, does nothing and
-  // returns false.
-  // It is illegal to attempt to destroy the DefaultArena().
-  static bool DeleteArena(Arena *arena);
-
-  // The default arena that always exists.
-  static Arena *DefaultArena();
-
- private:
-  LowLevelAlloc();      // no instances
-};
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/low_level_alloc_test.cc b/third_party/abseil_cpp/absl/base/internal/low_level_alloc_test.cc
deleted file mode 100644
index 2f2eaffa032e..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/low_level_alloc_test.cc
+++ /dev/null
@@ -1,162 +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/base/internal/low_level_alloc.h"
-
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <thread>  // NOLINT(build/c++11)
-#include <unordered_map>
-#include <utility>
-
-#include "absl/container/node_hash_map.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-namespace {
-
-// This test doesn't use gtest since it needs to test that everything
-// works before main().
-#define TEST_ASSERT(x)                                           \
-  if (!(x)) {                                                    \
-    printf("TEST_ASSERT(%s) FAILED ON LINE %d\n", #x, __LINE__); \
-    abort();                                                     \
-  }
-
-// a block of memory obtained from the allocator
-struct BlockDesc {
-  char *ptr;      // pointer to memory
-  int len;        // number of bytes
-  int fill;       // filled with data starting with this
-};
-
-// Check that the pattern placed in the block d
-// by RandomizeBlockDesc is still there.
-static void CheckBlockDesc(const BlockDesc &d) {
-  for (int i = 0; i != d.len; i++) {
-    TEST_ASSERT((d.ptr[i] & 0xff) == ((d.fill + i) & 0xff));
-  }
-}
-
-// Fill the block "*d" with a pattern
-// starting with a random byte.
-static void RandomizeBlockDesc(BlockDesc *d) {
-  d->fill = rand() & 0xff;
-  for (int i = 0; i != d->len; i++) {
-    d->ptr[i] = (d->fill + i) & 0xff;
-  }
-}
-
-// Use to indicate to the malloc hooks that
-// this calls is from LowLevelAlloc.
-static bool using_low_level_alloc = false;
-
-// n times, toss a coin, and based on the outcome
-// either allocate a new block or deallocate an old block.
-// New blocks are placed in a std::unordered_map with a random key
-// and initialized with RandomizeBlockDesc().
-// If keys conflict, the older block is freed.
-// Old blocks are always checked with CheckBlockDesc()
-// before being freed.  At the end of the run,
-// all remaining allocated blocks are freed.
-// If use_new_arena is true, use a fresh arena, and then delete it.
-// If call_malloc_hook is true and user_arena is true,
-// allocations and deallocations are reported via the MallocHook
-// interface.
-static void Test(bool use_new_arena, bool call_malloc_hook, int n) {
-  typedef absl::node_hash_map<int, BlockDesc> AllocMap;
-  AllocMap allocated;
-  AllocMap::iterator it;
-  BlockDesc block_desc;
-  int rnd;
-  LowLevelAlloc::Arena *arena = 0;
-  if (use_new_arena) {
-    int32_t flags = call_malloc_hook ? LowLevelAlloc::kCallMallocHook : 0;
-    arena = LowLevelAlloc::NewArena(flags);
-  }
-  for (int i = 0; i != n; i++) {
-    if (i != 0 && i % 10000 == 0) {
-      printf(".");
-      fflush(stdout);
-    }
-
-    switch (rand() & 1) {      // toss a coin
-    case 0:     // coin came up heads: add a block
-      using_low_level_alloc = true;
-      block_desc.len = rand() & 0x3fff;
-      block_desc.ptr =
-        reinterpret_cast<char *>(
-                        arena == 0
-                        ? LowLevelAlloc::Alloc(block_desc.len)
-                        : LowLevelAlloc::AllocWithArena(block_desc.len, arena));
-      using_low_level_alloc = false;
-      RandomizeBlockDesc(&block_desc);
-      rnd = rand();
-      it = allocated.find(rnd);
-      if (it != allocated.end()) {
-        CheckBlockDesc(it->second);
-        using_low_level_alloc = true;
-        LowLevelAlloc::Free(it->second.ptr);
-        using_low_level_alloc = false;
-        it->second = block_desc;
-      } else {
-        allocated[rnd] = block_desc;
-      }
-      break;
-    case 1:     // coin came up tails: remove a block
-      it = allocated.begin();
-      if (it != allocated.end()) {
-        CheckBlockDesc(it->second);
-        using_low_level_alloc = true;
-        LowLevelAlloc::Free(it->second.ptr);
-        using_low_level_alloc = false;
-        allocated.erase(it);
-      }
-      break;
-    }
-  }
-  // remove all remaining blocks
-  while ((it = allocated.begin()) != allocated.end()) {
-    CheckBlockDesc(it->second);
-    using_low_level_alloc = true;
-    LowLevelAlloc::Free(it->second.ptr);
-    using_low_level_alloc = false;
-    allocated.erase(it);
-  }
-  if (use_new_arena) {
-    TEST_ASSERT(LowLevelAlloc::DeleteArena(arena));
-  }
-}
-
-// LowLevelAlloc is designed to be safe to call before main().
-static struct BeforeMain {
-  BeforeMain() {
-    Test(false, false, 50000);
-    Test(true, false, 50000);
-    Test(true, true, 50000);
-  }
-} before_main;
-
-}  // namespace
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-int main(int argc, char *argv[]) {
-  // The actual test runs in the global constructor of `before_main`.
-  printf("PASS\n");
-  return 0;
-}
diff --git a/third_party/abseil_cpp/absl/base/internal/low_level_scheduling.h b/third_party/abseil_cpp/absl/base/internal/low_level_scheduling.h
deleted file mode 100644
index 9baccc0659be..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/low_level_scheduling.h
+++ /dev/null
@@ -1,134 +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.
-//
-// Core interfaces and definitions used by by low-level interfaces such as
-// SpinLock.
-
-#ifndef ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
-#define ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/scheduling_mode.h"
-#include "absl/base/macros.h"
-
-// The following two declarations exist so SchedulingGuard may friend them with
-// the appropriate language linkage.  These callbacks allow libc internals, such
-// as function level statics, to schedule cooperatively when locking.
-extern "C" bool __google_disable_rescheduling(void);
-extern "C" void __google_enable_rescheduling(bool disable_result);
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-class CondVar;
-class Mutex;
-
-namespace synchronization_internal {
-int MutexDelay(int32_t c, int mode);
-}  // namespace synchronization_internal
-
-namespace base_internal {
-
-class SchedulingHelper;  // To allow use of SchedulingGuard.
-class SpinLock;          // To allow use of SchedulingGuard.
-
-// SchedulingGuard
-// Provides guard semantics that may be used to disable cooperative rescheduling
-// of the calling thread within specific program blocks.  This is used to
-// protect resources (e.g. low-level SpinLocks or Domain code) that cooperative
-// scheduling depends on.
-//
-// Domain implementations capable of rescheduling in reaction to involuntary
-// kernel thread actions (e.g blocking due to a pagefault or syscall) must
-// guarantee that an annotated thread is not allowed to (cooperatively)
-// reschedule until the annotated region is complete.
-//
-// It is an error to attempt to use a cooperatively scheduled resource (e.g.
-// Mutex) within a rescheduling-disabled region.
-//
-// All methods are async-signal safe.
-class SchedulingGuard {
- public:
-  // Returns true iff the calling thread may be cooperatively rescheduled.
-  static bool ReschedulingIsAllowed();
-  SchedulingGuard(const SchedulingGuard&) = delete;
-  SchedulingGuard& operator=(const SchedulingGuard&) = delete;
-
- private:
-  // Disable cooperative rescheduling of the calling thread.  It may still
-  // initiate scheduling operations (e.g. wake-ups), however, it may not itself
-  // reschedule.  Nestable.  The returned result is opaque, clients should not
-  // attempt to interpret it.
-  // REQUIRES: Result must be passed to a pairing EnableScheduling().
-  static bool DisableRescheduling();
-
-  // Marks the end of a rescheduling disabled region, previously started by
-  // DisableRescheduling().
-  // REQUIRES: Pairs with innermost call (and result) of DisableRescheduling().
-  static void EnableRescheduling(bool disable_result);
-
-  // A scoped helper for {Disable, Enable}Rescheduling().
-  // REQUIRES: destructor must run in same thread as constructor.
-  struct ScopedDisable {
-    ScopedDisable() { disabled = SchedulingGuard::DisableRescheduling(); }
-    ~ScopedDisable() { SchedulingGuard::EnableRescheduling(disabled); }
-
-    bool disabled;
-  };
-
-  // A scoped helper to enable rescheduling temporarily.
-  // REQUIRES: destructor must run in same thread as constructor.
-  class ScopedEnable {
-   public:
-    ScopedEnable();
-    ~ScopedEnable();
-
-   private:
-    int scheduling_disabled_depth_;
-  };
-
-  // Access to SchedulingGuard is explicitly permitted.
-  friend class absl::CondVar;
-  friend class absl::Mutex;
-  friend class SchedulingHelper;
-  friend class SpinLock;
-  friend int absl::synchronization_internal::MutexDelay(int32_t c, int mode);
-};
-
-//------------------------------------------------------------------------------
-// End of public interfaces.
-//------------------------------------------------------------------------------
-
-inline bool SchedulingGuard::ReschedulingIsAllowed() {
-  return false;
-}
-
-inline bool SchedulingGuard::DisableRescheduling() {
-  return false;
-}
-
-inline void SchedulingGuard::EnableRescheduling(bool /* disable_result */) {
-  return;
-}
-
-inline SchedulingGuard::ScopedEnable::ScopedEnable()
-    : scheduling_disabled_depth_(0) {}
-inline SchedulingGuard::ScopedEnable::~ScopedEnable() {
-  ABSL_RAW_CHECK(scheduling_disabled_depth_ == 0, "disable unused warning");
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/per_thread_tls.h b/third_party/abseil_cpp/absl/base/internal/per_thread_tls.h
deleted file mode 100644
index cf5e97a0470e..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/per_thread_tls.h
+++ /dev/null
@@ -1,52 +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_BASE_INTERNAL_PER_THREAD_TLS_H_
-#define ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
-
-// This header defines two macros:
-//
-// If the platform supports thread-local storage:
-//
-// * ABSL_PER_THREAD_TLS_KEYWORD is the C keyword needed to declare a
-//   thread-local variable
-// * ABSL_PER_THREAD_TLS is 1
-//
-// Otherwise:
-//
-// * ABSL_PER_THREAD_TLS_KEYWORD is empty
-// * ABSL_PER_THREAD_TLS is 0
-//
-// Microsoft C supports thread-local storage.
-// GCC supports it if the appropriate version of glibc is available,
-// which the programmer can indicate by defining ABSL_HAVE_TLS
-
-#include "absl/base/port.h"  // For ABSL_HAVE_TLS
-
-#if defined(ABSL_PER_THREAD_TLS)
-#error ABSL_PER_THREAD_TLS cannot be directly set
-#elif defined(ABSL_PER_THREAD_TLS_KEYWORD)
-#error ABSL_PER_THREAD_TLS_KEYWORD cannot be directly set
-#elif defined(ABSL_HAVE_TLS)
-#define ABSL_PER_THREAD_TLS_KEYWORD __thread
-#define ABSL_PER_THREAD_TLS 1
-#elif defined(_MSC_VER)
-#define ABSL_PER_THREAD_TLS_KEYWORD __declspec(thread)
-#define ABSL_PER_THREAD_TLS 1
-#else
-#define ABSL_PER_THREAD_TLS_KEYWORD
-#define ABSL_PER_THREAD_TLS 0
-#endif
-
-#endif  // ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/periodic_sampler.cc b/third_party/abseil_cpp/absl/base/internal/periodic_sampler.cc
deleted file mode 100644
index 520dabbaa006..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/periodic_sampler.cc
+++ /dev/null
@@ -1,53 +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.
-
-#include "absl/base/internal/periodic_sampler.h"
-
-#include <atomic>
-
-#include "absl/base/internal/exponential_biased.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-int64_t PeriodicSamplerBase::GetExponentialBiased(int period) noexcept {
-  return rng_.GetStride(period);
-}
-
-bool PeriodicSamplerBase::SubtleConfirmSample() noexcept {
-  int current_period = period();
-
-  // Deal with period case 0 (always off) and 1 (always on)
-  if (ABSL_PREDICT_FALSE(current_period < 2)) {
-    stride_ = 0;
-    return current_period == 1;
-  }
-
-  // Check if this is the first call to Sample()
-  if (ABSL_PREDICT_FALSE(stride_ == 1)) {
-    stride_ = static_cast<uint64_t>(-GetExponentialBiased(current_period));
-    if (static_cast<int64_t>(stride_) < -1) {
-      ++stride_;
-      return false;
-    }
-  }
-
-  stride_ = static_cast<uint64_t>(-GetExponentialBiased(current_period));
-  return true;
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/periodic_sampler.h b/third_party/abseil_cpp/absl/base/internal/periodic_sampler.h
deleted file mode 100644
index f8a86796b117..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/periodic_sampler.h
+++ /dev/null
@@ -1,211 +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_BASE_INTERNAL_PERIODIC_SAMPLER_H_
-#define ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
-
-#include <stdint.h>
-
-#include <atomic>
-
-#include "absl/base/internal/exponential_biased.h"
-#include "absl/base/optimization.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// PeriodicSamplerBase provides the basic period sampler implementation.
-//
-// This is the base class for the templated PeriodicSampler class, which holds
-// a global std::atomic value identified by a user defined tag, such that
-// each specific PeriodSampler implementation holds its own global period.
-//
-// PeriodicSamplerBase is thread-compatible except where stated otherwise.
-class PeriodicSamplerBase {
- public:
-  // PeriodicSamplerBase is trivial / copyable / movable / destructible.
-  PeriodicSamplerBase() = default;
-  PeriodicSamplerBase(PeriodicSamplerBase&&) = default;
-  PeriodicSamplerBase(const PeriodicSamplerBase&) = default;
-
-  // Returns true roughly once every `period` calls. This is established by a
-  // randomly picked `stride` that is counted down on each call to `Sample`.
-  // This stride is picked such that the probability of `Sample()` returning
-  // true is 1 in `period`.
-  inline bool Sample() noexcept;
-
-  // The below methods are intended for optimized use cases where the
-  // size of the inlined fast path code is highly important. Applications
-  // should use the `Sample()` method unless they have proof that their
-  // specific use case requires the optimizations offered by these methods.
-  //
-  // An example of such a use case is SwissTable sampling. All sampling checks
-  // are in inlined SwissTable methods, and the number of call sites is huge.
-  // In this case, the inlined code size added to each translation unit calling
-  // SwissTable methods is non-trivial.
-  //
-  // The `SubtleMaybeSample()` function spuriously returns true even if the
-  // function should not be sampled, applications MUST match each call to
-  // 'SubtleMaybeSample()' returning true with a `SubtleConfirmSample()` call,
-  // and use the result of the latter as the sampling decision.
-  // In other words: the code should logically be equivalent to:
-  //
-  //    if (SubtleMaybeSample() && SubtleConfirmSample()) {
-  //      // Sample this call
-  //    }
-  //
-  // In the 'inline-size' optimized case, the `SubtleConfirmSample()` call can
-  // be placed out of line, for example, the typical use case looks as follows:
-  //
-  //   // --- frobber.h -----------
-  //   void FrobberSampled();
-  //
-  //   inline void FrobberImpl() {
-  //     // ...
-  //   }
-  //
-  //   inline void Frobber() {
-  //     if (ABSL_PREDICT_FALSE(sampler.SubtleMaybeSample())) {
-  //       FrobberSampled();
-  //     } else {
-  //       FrobberImpl();
-  //     }
-  //   }
-  //
-  //   // --- frobber.cc -----------
-  //   void FrobberSampled() {
-  //     if (!sampler.SubtleConfirmSample())) {
-  //       // Spurious false positive
-  //       FrobberImpl();
-  //       return;
-  //     }
-  //
-  //     // Sampled execution
-  //     // ...
-  //   }
-  inline bool SubtleMaybeSample() noexcept;
-  bool SubtleConfirmSample() noexcept;
-
- protected:
-  // We explicitly don't use a virtual destructor as this class is never
-  // virtually destroyed, and it keeps the class trivial, which avoids TLS
-  // prologue and epilogue code for our TLS instances.
-  ~PeriodicSamplerBase() = default;
-
-  // Returns the next stride for our sampler.
-  // This function is virtual for testing purposes only.
-  virtual int64_t GetExponentialBiased(int period) noexcept;
-
- private:
-  // Returns the current period of this sampler. Thread-safe.
-  virtual int period() const noexcept = 0;
-
-  // Keep and decrement stride_ as an unsigned integer, but compare the value
-  // to zero casted as a signed int. clang and msvc do not create optimum code
-  // if we use signed for the combined decrement and sign comparison.
-  //
-  // Below 3 alternative options, all compiles generate the best code
-  // using the unsigned increment <---> signed int comparison option.
-  //
-  // Option 1:
-  //   int64_t stride_;
-  //   if (ABSL_PREDICT_TRUE(++stride_ < 0)) { ... }
-  //
-  //   GCC   x64 (OK) : https://gcc.godbolt.org/z/R5MzzA
-  //   GCC   ppc (OK) : https://gcc.godbolt.org/z/z7NZAt
-  //   Clang x64 (BAD): https://gcc.godbolt.org/z/t4gPsd
-  //   ICC   x64 (OK) : https://gcc.godbolt.org/z/rE6s8W
-  //   MSVC  x64 (OK) : https://gcc.godbolt.org/z/ARMXqS
-  //
-  // Option 2:
-  //   int64_t stride_ = 0;
-  //   if (ABSL_PREDICT_TRUE(--stride_ >= 0)) { ... }
-  //
-  //   GCC   x64 (OK) : https://gcc.godbolt.org/z/jSQxYK
-  //   GCC   ppc (OK) : https://gcc.godbolt.org/z/VJdYaA
-  //   Clang x64 (BAD): https://gcc.godbolt.org/z/Xm4NjX
-  //   ICC   x64 (OK) : https://gcc.godbolt.org/z/4snaFd
-  //   MSVC  x64 (BAD): https://gcc.godbolt.org/z/BgnEKE
-  //
-  // Option 3:
-  //   uint64_t stride_;
-  //   if (ABSL_PREDICT_TRUE(static_cast<int64_t>(++stride_) < 0)) { ... }
-  //
-  //   GCC   x64 (OK) : https://gcc.godbolt.org/z/bFbfPy
-  //   GCC   ppc (OK) : https://gcc.godbolt.org/z/S9KkUE
-  //   Clang x64 (OK) : https://gcc.godbolt.org/z/UYzRb4
-  //   ICC   x64 (OK) : https://gcc.godbolt.org/z/ptTNfD
-  //   MSVC  x64 (OK) : https://gcc.godbolt.org/z/76j4-5
-  uint64_t stride_ = 0;
-  ExponentialBiased rng_;
-};
-
-inline bool PeriodicSamplerBase::SubtleMaybeSample() noexcept {
-  // See comments on `stride_` for the unsigned increment / signed compare.
-  if (ABSL_PREDICT_TRUE(static_cast<int64_t>(++stride_) < 0)) {
-    return false;
-  }
-  return true;
-}
-
-inline bool PeriodicSamplerBase::Sample() noexcept {
-  return ABSL_PREDICT_FALSE(SubtleMaybeSample()) ? SubtleConfirmSample()
-                                                 : false;
-}
-
-// PeriodicSampler is a concreted periodic sampler implementation.
-// The user provided Tag identifies the implementation, and is required to
-// isolate the global state of this instance from other instances.
-//
-// Typical use case:
-//
-//   struct HashTablezTag {};
-//   thread_local PeriodicSampler sampler;
-//
-//   void HashTableSamplingLogic(...) {
-//     if (sampler.Sample()) {
-//       HashTableSlowSamplePath(...);
-//     }
-//   }
-//
-template <typename Tag, int default_period = 0>
-class PeriodicSampler final : public PeriodicSamplerBase {
- public:
-  ~PeriodicSampler() = default;
-
-  int period() const noexcept final {
-    return period_.load(std::memory_order_relaxed);
-  }
-
-  // Sets the global period for this sampler. Thread-safe.
-  // Setting a period of 0 disables the sampler, i.e., every call to Sample()
-  // will return false. Setting a period of 1 puts the sampler in 'always on'
-  // mode, i.e., every call to Sample() returns true.
-  static void SetGlobalPeriod(int period) {
-    period_.store(period, std::memory_order_relaxed);
-  }
-
- private:
-  static std::atomic<int> period_;
-};
-
-template <typename Tag, int default_period>
-std::atomic<int> PeriodicSampler<Tag, default_period>::period_(default_period);
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/periodic_sampler_benchmark.cc b/third_party/abseil_cpp/absl/base/internal/periodic_sampler_benchmark.cc
deleted file mode 100644
index 5ad469ce79c2..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/periodic_sampler_benchmark.cc
+++ /dev/null
@@ -1,79 +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.
-
-#include "benchmark/benchmark.h"
-#include "absl/base/internal/periodic_sampler.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-namespace {
-
-template <typename Sampler>
-void BM_Sample(Sampler* sampler, benchmark::State& state) {
-  for (auto _ : state) {
-    benchmark::DoNotOptimize(sampler);
-    benchmark::DoNotOptimize(sampler->Sample());
-  }
-}
-
-template <typename Sampler>
-void BM_SampleMinunumInlined(Sampler* sampler, benchmark::State& state) {
-  for (auto _ : state) {
-    benchmark::DoNotOptimize(sampler);
-    if (ABSL_PREDICT_FALSE(sampler->SubtleMaybeSample())) {
-      benchmark::DoNotOptimize(sampler->SubtleConfirmSample());
-    }
-  }
-}
-
-void BM_PeriodicSampler_TinySample(benchmark::State& state) {
-  struct Tag {};
-  PeriodicSampler<Tag, 10> sampler;
-  BM_Sample(&sampler, state);
-}
-BENCHMARK(BM_PeriodicSampler_TinySample);
-
-void BM_PeriodicSampler_ShortSample(benchmark::State& state) {
-  struct Tag {};
-  PeriodicSampler<Tag, 1024> sampler;
-  BM_Sample(&sampler, state);
-}
-BENCHMARK(BM_PeriodicSampler_ShortSample);
-
-void BM_PeriodicSampler_LongSample(benchmark::State& state) {
-  struct Tag {};
-  PeriodicSampler<Tag, 1024 * 1024> sampler;
-  BM_Sample(&sampler, state);
-}
-BENCHMARK(BM_PeriodicSampler_LongSample);
-
-void BM_PeriodicSampler_LongSampleMinunumInlined(benchmark::State& state) {
-  struct Tag {};
-  PeriodicSampler<Tag, 1024 * 1024> sampler;
-  BM_SampleMinunumInlined(&sampler, state);
-}
-BENCHMARK(BM_PeriodicSampler_LongSampleMinunumInlined);
-
-void BM_PeriodicSampler_Disabled(benchmark::State& state) {
-  struct Tag {};
-  PeriodicSampler<Tag, 0> sampler;
-  BM_Sample(&sampler, state);
-}
-BENCHMARK(BM_PeriodicSampler_Disabled);
-
-}  // namespace
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/periodic_sampler_test.cc b/third_party/abseil_cpp/absl/base/internal/periodic_sampler_test.cc
deleted file mode 100644
index 3b301e37ab98..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/periodic_sampler_test.cc
+++ /dev/null
@@ -1,177 +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.
-
-#include "absl/base/internal/periodic_sampler.h"
-
-#include <thread>  // NOLINT(build/c++11)
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/base/attributes.h"
-#include "absl/base/macros.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-namespace {
-
-using testing::Eq;
-using testing::Return;
-using testing::StrictMock;
-
-class MockPeriodicSampler : public PeriodicSamplerBase {
- public:
-  virtual ~MockPeriodicSampler() = default;
-
-  MOCK_METHOD(int, period, (), (const, noexcept));
-  MOCK_METHOD(int64_t, GetExponentialBiased, (int), (noexcept));
-};
-
-TEST(PeriodicSamplerBaseTest, Sample) {
-  StrictMock<MockPeriodicSampler> sampler;
-
-  EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(16));
-  EXPECT_CALL(sampler, GetExponentialBiased(16))
-      .WillOnce(Return(2))
-      .WillOnce(Return(3))
-      .WillOnce(Return(4));
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_TRUE(sampler.Sample());
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_TRUE(sampler.Sample());
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-}
-
-TEST(PeriodicSamplerBaseTest, ImmediatelySample) {
-  StrictMock<MockPeriodicSampler> sampler;
-
-  EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(16));
-  EXPECT_CALL(sampler, GetExponentialBiased(16))
-      .WillOnce(Return(1))
-      .WillOnce(Return(2))
-      .WillOnce(Return(3));
-
-  EXPECT_TRUE(sampler.Sample());
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_TRUE(sampler.Sample());
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-}
-
-TEST(PeriodicSamplerBaseTest, Disabled) {
-  StrictMock<MockPeriodicSampler> sampler;
-
-  EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(0));
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-}
-
-TEST(PeriodicSamplerBaseTest, AlwaysOn) {
-  StrictMock<MockPeriodicSampler> sampler;
-
-  EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(1));
-
-  EXPECT_TRUE(sampler.Sample());
-  EXPECT_TRUE(sampler.Sample());
-  EXPECT_TRUE(sampler.Sample());
-}
-
-TEST(PeriodicSamplerBaseTest, Disable) {
-  StrictMock<MockPeriodicSampler> sampler;
-
-  EXPECT_CALL(sampler, period()).WillOnce(Return(16));
-  EXPECT_CALL(sampler, GetExponentialBiased(16)).WillOnce(Return(3));
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-
-  EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(0));
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-}
-
-TEST(PeriodicSamplerBaseTest, Enable) {
-  StrictMock<MockPeriodicSampler> sampler;
-
-  EXPECT_CALL(sampler, period()).WillOnce(Return(0));
-  EXPECT_FALSE(sampler.Sample());
-
-  EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(16));
-  EXPECT_CALL(sampler, GetExponentialBiased(16))
-      .Times(2)
-      .WillRepeatedly(Return(3));
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_TRUE(sampler.Sample());
-
-  EXPECT_FALSE(sampler.Sample());
-  EXPECT_FALSE(sampler.Sample());
-}
-
-TEST(PeriodicSamplerTest, ConstructConstInit) {
-  struct Tag {};
-  ABSL_CONST_INIT static PeriodicSampler<Tag> sampler;
-  (void)sampler;
-}
-
-TEST(PeriodicSamplerTest, DefaultPeriod0) {
-  struct Tag {};
-  PeriodicSampler<Tag> sampler;
-  EXPECT_THAT(sampler.period(), Eq(0));
-}
-
-TEST(PeriodicSamplerTest, DefaultPeriod) {
-  struct Tag {};
-  PeriodicSampler<Tag, 100> sampler;
-  EXPECT_THAT(sampler.period(), Eq(100));
-}
-
-TEST(PeriodicSamplerTest, SetGlobalPeriod) {
-  struct Tag1 {};
-  struct Tag2 {};
-  PeriodicSampler<Tag1, 25> sampler1;
-  PeriodicSampler<Tag2, 50> sampler2;
-
-  EXPECT_THAT(sampler1.period(), Eq(25));
-  EXPECT_THAT(sampler2.period(), Eq(50));
-
-  std::thread thread([] {
-    PeriodicSampler<Tag1, 25> sampler1;
-    PeriodicSampler<Tag2, 50> sampler2;
-    EXPECT_THAT(sampler1.period(), Eq(25));
-    EXPECT_THAT(sampler2.period(), Eq(50));
-    sampler1.SetGlobalPeriod(10);
-    sampler2.SetGlobalPeriod(20);
-  });
-  thread.join();
-
-  EXPECT_THAT(sampler1.period(), Eq(10));
-  EXPECT_THAT(sampler2.period(), Eq(20));
-}
-
-}  // namespace
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/pretty_function.h b/third_party/abseil_cpp/absl/base/internal/pretty_function.h
deleted file mode 100644
index 35d51676dc2e..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/pretty_function.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_BASE_INTERNAL_PRETTY_FUNCTION_H_
-#define ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_
-
-// ABSL_PRETTY_FUNCTION
-//
-// In C++11, __func__ gives the undecorated name of the current function.  That
-// is, "main", not "int main()".  Various compilers give extra macros to get the
-// decorated function name, including return type and arguments, to
-// differentiate between overload sets.  ABSL_PRETTY_FUNCTION is a portable
-// version of these macros which forwards to the correct macro on each compiler.
-#if defined(_MSC_VER)
-#define ABSL_PRETTY_FUNCTION __FUNCSIG__
-#elif defined(__GNUC__)
-#define ABSL_PRETTY_FUNCTION __PRETTY_FUNCTION__
-#else
-#error "Unsupported compiler"
-#endif
-
-#endif  // ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/raw_logging.cc b/third_party/abseil_cpp/absl/base/internal/raw_logging.cc
deleted file mode 100644
index ae8754c6a132..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/raw_logging.cc
+++ /dev/null
@@ -1,240 +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/base/internal/raw_logging.h"
-
-#include <stddef.h>
-#include <cstdarg>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-#include "absl/base/internal/atomic_hook.h"
-#include "absl/base/log_severity.h"
-
-// We know how to perform low-level writes to stderr in POSIX and Windows.  For
-// these platforms, we define the token ABSL_LOW_LEVEL_WRITE_SUPPORTED.
-// Much of raw_logging.cc becomes a no-op when we can't output messages,
-// although a FATAL ABSL_RAW_LOG message will still abort the process.
-
-// ABSL_HAVE_POSIX_WRITE is defined when the platform provides posix write()
-// (as from unistd.h)
-//
-// This preprocessor token is also defined in raw_io.cc.  If you need to copy
-// this, consider moving both to config.h instead.
-#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
-    defined(__Fuchsia__) || defined(__native_client__) || \
-    defined(__EMSCRIPTEN__) || defined(__ASYLO__)
-
-#include <unistd.h>
-
-#define ABSL_HAVE_POSIX_WRITE 1
-#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
-#else
-#undef ABSL_HAVE_POSIX_WRITE
-#endif
-
-// ABSL_HAVE_SYSCALL_WRITE is defined when the platform provides the syscall
-//   syscall(SYS_write, /*int*/ fd, /*char* */ buf, /*size_t*/ len);
-// for low level operations that want to avoid libc.
-#if (defined(__linux__) || defined(__FreeBSD__)) && !defined(__ANDROID__)
-#include <sys/syscall.h>
-#define ABSL_HAVE_SYSCALL_WRITE 1
-#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
-#else
-#undef ABSL_HAVE_SYSCALL_WRITE
-#endif
-
-#ifdef _WIN32
-#include <io.h>
-
-#define ABSL_HAVE_RAW_IO 1
-#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
-#else
-#undef ABSL_HAVE_RAW_IO
-#endif
-
-// TODO(gfalcon): We want raw-logging to work on as many platforms as possible.
-// Explicitly #error out when not ABSL_LOW_LEVEL_WRITE_SUPPORTED, except for a
-// selected set of platforms for which we expect not to be able to raw log.
-
-ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
-    absl::raw_logging_internal::LogPrefixHook>
-    log_prefix_hook;
-ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
-    absl::raw_logging_internal::AbortHook>
-    abort_hook;
-
-#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
-static const char kTruncated[] = " ... (message truncated)\n";
-
-// sprintf the format to the buffer, adjusting *buf and *size to reflect the
-// consumed bytes, and return whether the message fit without truncation.  If
-// truncation occurred, if possible leave room in the buffer for the message
-// kTruncated[].
-inline static bool VADoRawLog(char** buf, int* size, const char* format,
-                              va_list ap) ABSL_PRINTF_ATTRIBUTE(3, 0);
-inline static bool VADoRawLog(char** buf, int* size,
-                              const char* format, va_list ap) {
-  int n = vsnprintf(*buf, *size, format, ap);
-  bool result = true;
-  if (n < 0 || n > *size) {
-    result = false;
-    if (static_cast<size_t>(*size) > sizeof(kTruncated)) {
-      n = *size - sizeof(kTruncated);  // room for truncation message
-    } else {
-      n = 0;                           // no room for truncation message
-    }
-  }
-  *size -= n;
-  *buf += n;
-  return result;
-}
-#endif  // ABSL_LOW_LEVEL_WRITE_SUPPORTED
-
-static constexpr int kLogBufSize = 3000;
-
-namespace {
-
-// CAVEAT: vsnprintf called from *DoRawLog below has some (exotic) code paths
-// that invoke malloc() and getenv() that might acquire some locks.
-
-// Helper for RawLog below.
-// *DoRawLog writes to *buf of *size and move them past the written portion.
-// It returns true iff there was no overflow or error.
-bool DoRawLog(char** buf, int* size, const char* format, ...)
-    ABSL_PRINTF_ATTRIBUTE(3, 4);
-bool DoRawLog(char** buf, int* size, const char* format, ...) {
-  va_list ap;
-  va_start(ap, format);
-  int n = vsnprintf(*buf, *size, format, ap);
-  va_end(ap);
-  if (n < 0 || n > *size) return false;
-  *size -= n;
-  *buf += n;
-  return true;
-}
-
-void RawLogVA(absl::LogSeverity severity, const char* file, int line,
-              const char* format, va_list ap) ABSL_PRINTF_ATTRIBUTE(4, 0);
-void RawLogVA(absl::LogSeverity severity, const char* file, int line,
-              const char* format, va_list ap) {
-  char buffer[kLogBufSize];
-  char* buf = buffer;
-  int size = sizeof(buffer);
-#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
-  bool enabled = true;
-#else
-  bool enabled = false;
-#endif
-
-#ifdef ABSL_MIN_LOG_LEVEL
-  if (severity < static_cast<absl::LogSeverity>(ABSL_MIN_LOG_LEVEL) &&
-      severity < absl::LogSeverity::kFatal) {
-    enabled = false;
-  }
-#endif
-
-  auto log_prefix_hook_ptr = log_prefix_hook.Load();
-  if (log_prefix_hook_ptr) {
-    enabled = log_prefix_hook_ptr(severity, file, line, &buf, &size);
-  } else {
-    if (enabled) {
-      DoRawLog(&buf, &size, "[%s : %d] RAW: ", file, line);
-    }
-  }
-  const char* const prefix_end = buf;
-
-#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
-  if (enabled) {
-    bool no_chop = VADoRawLog(&buf, &size, format, ap);
-    if (no_chop) {
-      DoRawLog(&buf, &size, "\n");
-    } else {
-      DoRawLog(&buf, &size, "%s", kTruncated);
-    }
-    absl::raw_logging_internal::SafeWriteToStderr(buffer, strlen(buffer));
-  }
-#else
-  static_cast<void>(format);
-  static_cast<void>(ap);
-#endif
-
-  // Abort the process after logging a FATAL message, even if the output itself
-  // was suppressed.
-  if (severity == absl::LogSeverity::kFatal) {
-    abort_hook(file, line, buffer, prefix_end, buffer + kLogBufSize);
-    abort();
-  }
-}
-
-}  // namespace
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace raw_logging_internal {
-void SafeWriteToStderr(const char *s, size_t len) {
-#if defined(ABSL_HAVE_SYSCALL_WRITE)
-  syscall(SYS_write, STDERR_FILENO, s, len);
-#elif defined(ABSL_HAVE_POSIX_WRITE)
-  write(STDERR_FILENO, s, len);
-#elif defined(ABSL_HAVE_RAW_IO)
-  _write(/* stderr */ 2, s, len);
-#else
-  // stderr logging unsupported on this platform
-  (void) s;
-  (void) len;
-#endif
-}
-
-void RawLog(absl::LogSeverity severity, const char* file, int line,
-            const char* format, ...) ABSL_PRINTF_ATTRIBUTE(4, 5);
-void RawLog(absl::LogSeverity severity, const char* file, int line,
-            const char* format, ...) {
-  va_list ap;
-  va_start(ap, format);
-  RawLogVA(severity, file, line, format, ap);
-  va_end(ap);
-}
-
-// Non-formatting version of RawLog().
-//
-// TODO(gfalcon): When string_view no longer depends on base, change this
-// interface to take its message as a string_view instead.
-static void DefaultInternalLog(absl::LogSeverity severity, const char* file,
-                               int line, const std::string& message) {
-  RawLog(severity, file, line, "%s", message.c_str());
-}
-
-bool RawLoggingFullySupported() {
-#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
-  return true;
-#else  // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
-  return false;
-#endif  // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
-}
-
-ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_DLL
-    absl::base_internal::AtomicHook<InternalLogFunction>
-        internal_log_function(DefaultInternalLog);
-
-void RegisterInternalLogFunction(InternalLogFunction func) {
-  internal_log_function.Store(func);
-}
-
-}  // namespace raw_logging_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/raw_logging.h b/third_party/abseil_cpp/absl/base/internal/raw_logging.h
deleted file mode 100644
index 20f4291b162b..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/raw_logging.h
+++ /dev/null
@@ -1,187 +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.
-//
-// Thread-safe logging routines that do not allocate any memory or
-// acquire any locks, and can therefore be used by low-level memory
-// allocation, synchronization, and signal-handling code.
-
-#ifndef ABSL_BASE_INTERNAL_RAW_LOGGING_H_
-#define ABSL_BASE_INTERNAL_RAW_LOGGING_H_
-
-#include <string>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-#include "absl/base/internal/atomic_hook.h"
-#include "absl/base/log_severity.h"
-#include "absl/base/macros.h"
-#include "absl/base/optimization.h"
-#include "absl/base/port.h"
-
-// This is similar to LOG(severity) << format..., but
-// * it is to be used ONLY by low-level modules that can't use normal LOG()
-// * it is designed to be a low-level logger that does not allocate any
-//   memory and does not need any locks, hence:
-// * it logs straight and ONLY to STDERR w/o buffering
-// * it uses an explicit printf-format and arguments list
-// * it will silently chop off really long message strings
-// Usage example:
-//   ABSL_RAW_LOG(ERROR, "Failed foo with %i: %s", status, error);
-// This will print an almost standard log line like this to stderr only:
-//   E0821 211317 file.cc:123] RAW: Failed foo with 22: bad_file
-
-#define ABSL_RAW_LOG(severity, ...)                                            \
-  do {                                                                         \
-    constexpr const char* absl_raw_logging_internal_basename =                 \
-        ::absl::raw_logging_internal::Basename(__FILE__,                       \
-                                               sizeof(__FILE__) - 1);          \
-    ::absl::raw_logging_internal::RawLog(ABSL_RAW_LOGGING_INTERNAL_##severity, \
-                                         absl_raw_logging_internal_basename,   \
-                                         __LINE__, __VA_ARGS__);               \
-  } while (0)
-
-// Similar to CHECK(condition) << message, but for low-level modules:
-// we use only ABSL_RAW_LOG that does not allocate memory.
-// We do not want to provide args list here to encourage this usage:
-//   if (!cond)  ABSL_RAW_LOG(FATAL, "foo ...", hard_to_compute_args);
-// so that the args are not computed when not needed.
-#define ABSL_RAW_CHECK(condition, message)                             \
-  do {                                                                 \
-    if (ABSL_PREDICT_FALSE(!(condition))) {                            \
-      ABSL_RAW_LOG(FATAL, "Check %s failed: %s", #condition, message); \
-    }                                                                  \
-  } while (0)
-
-// ABSL_INTERNAL_LOG and ABSL_INTERNAL_CHECK work like the RAW variants above,
-// except that if the richer log library is linked into the binary, we dispatch
-// to that instead.  This is potentially useful for internal logging and
-// assertions, where we are using RAW_LOG neither for its async-signal-safety
-// nor for its non-allocating nature, but rather because raw logging has very
-// few other dependencies.
-//
-// The API is a subset of the above: each macro only takes two arguments.  Use
-// StrCat if you need to build a richer message.
-#define ABSL_INTERNAL_LOG(severity, message)                                 \
-  do {                                                                       \
-    constexpr const char* absl_raw_logging_internal_filename = __FILE__;     \
-    ::absl::raw_logging_internal::internal_log_function(                     \
-        ABSL_RAW_LOGGING_INTERNAL_##severity,                                \
-        absl_raw_logging_internal_filename, __LINE__, message);              \
-    if (ABSL_RAW_LOGGING_INTERNAL_##severity == ::absl::LogSeverity::kFatal) \
-      ABSL_INTERNAL_UNREACHABLE;                                             \
-  } while (0)
-
-#define ABSL_INTERNAL_CHECK(condition, message)                    \
-  do {                                                             \
-    if (ABSL_PREDICT_FALSE(!(condition))) {                        \
-      std::string death_message = "Check " #condition " failed: "; \
-      death_message += std::string(message);                       \
-      ABSL_INTERNAL_LOG(FATAL, death_message);                     \
-    }                                                              \
-  } while (0)
-
-#define ABSL_RAW_LOGGING_INTERNAL_INFO ::absl::LogSeverity::kInfo
-#define ABSL_RAW_LOGGING_INTERNAL_WARNING ::absl::LogSeverity::kWarning
-#define ABSL_RAW_LOGGING_INTERNAL_ERROR ::absl::LogSeverity::kError
-#define ABSL_RAW_LOGGING_INTERNAL_FATAL ::absl::LogSeverity::kFatal
-#define ABSL_RAW_LOGGING_INTERNAL_LEVEL(severity) \
-  ::absl::NormalizeLogSeverity(severity)
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace raw_logging_internal {
-
-// Helper function to implement ABSL_RAW_LOG
-// Logs format... at "severity" level, reporting it
-// as called from file:line.
-// This does not allocate memory or acquire locks.
-void RawLog(absl::LogSeverity severity, const char* file, int line,
-            const char* format, ...) ABSL_PRINTF_ATTRIBUTE(4, 5);
-
-// Writes the provided buffer directly to stderr, in a safe, low-level manner.
-//
-// In POSIX this means calling write(), which is async-signal safe and does
-// not malloc.  If the platform supports the SYS_write syscall, we invoke that
-// directly to side-step any libc interception.
-void SafeWriteToStderr(const char *s, size_t len);
-
-// compile-time function to get the "base" filename, that is, the part of
-// a filename after the last "/" or "\" path separator.  The search starts at
-// the end of the string; the second parameter is the length of the string.
-constexpr const char* Basename(const char* fname, int offset) {
-  return offset == 0 || fname[offset - 1] == '/' || fname[offset - 1] == '\\'
-             ? fname + offset
-             : Basename(fname, offset - 1);
-}
-
-// For testing only.
-// Returns true if raw logging is fully supported. When it is not
-// fully supported, no messages will be emitted, but a log at FATAL
-// severity will cause an abort.
-//
-// TODO(gfalcon): Come up with a better name for this method.
-bool RawLoggingFullySupported();
-
-// Function type for a raw_logging customization hook for suppressing messages
-// by severity, and for writing custom prefixes on non-suppressed messages.
-//
-// The installed hook is called for every raw log invocation.  The message will
-// be logged to stderr only if the hook returns true.  FATAL errors will cause
-// the process to abort, even if writing to stderr is suppressed.  The hook is
-// also provided with an output buffer, where it can write a custom log message
-// prefix.
-//
-// The raw_logging system does not allocate memory or grab locks.  User-provided
-// hooks must avoid these operations, and must not throw exceptions.
-//
-// 'severity' is the severity level of the message being written.
-// 'file' and 'line' are the file and line number where the ABSL_RAW_LOG macro
-// was located.
-// 'buffer' and 'buf_size' are pointers to the buffer and buffer size.  If the
-// hook writes a prefix, it must increment *buffer and decrement *buf_size
-// accordingly.
-using LogPrefixHook = bool (*)(absl::LogSeverity severity, const char* file,
-                               int line, char** buffer, int* buf_size);
-
-// Function type for a raw_logging customization hook called to abort a process
-// when a FATAL message is logged.  If the provided AbortHook() returns, the
-// logging system will call abort().
-//
-// 'file' and 'line' are the file and line number where the ABSL_RAW_LOG macro
-// was located.
-// The NUL-terminated logged message lives in the buffer between 'buf_start'
-// and 'buf_end'.  'prefix_end' points to the first non-prefix character of the
-// buffer (as written by the LogPrefixHook.)
-using AbortHook = void (*)(const char* file, int line, const char* buf_start,
-                           const char* prefix_end, const char* buf_end);
-
-// Internal logging function for ABSL_INTERNAL_LOG to dispatch to.
-//
-// TODO(gfalcon): When string_view no longer depends on base, change this
-// interface to take its message as a string_view instead.
-using InternalLogFunction = void (*)(absl::LogSeverity severity,
-                                     const char* file, int line,
-                                     const std::string& message);
-
-ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_DLL extern base_internal::AtomicHook<
-    InternalLogFunction>
-    internal_log_function;
-
-void RegisterInternalLogFunction(InternalLogFunction func);
-
-}  // namespace raw_logging_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_RAW_LOGGING_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/scheduling_mode.h b/third_party/abseil_cpp/absl/base/internal/scheduling_mode.h
deleted file mode 100644
index 8be5ab6dd3c0..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/scheduling_mode.h
+++ /dev/null
@@ -1,58 +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.
-//
-// Core interfaces and definitions used by by low-level interfaces such as
-// SpinLock.
-
-#ifndef ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
-#define ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// Used to describe how a thread may be scheduled.  Typically associated with
-// the declaration of a resource supporting synchronized access.
-//
-// SCHEDULE_COOPERATIVE_AND_KERNEL:
-// Specifies that when waiting, a cooperative thread (e.g. a Fiber) may
-// reschedule (using base::scheduling semantics); allowing other cooperative
-// threads to proceed.
-//
-// SCHEDULE_KERNEL_ONLY: (Also described as "non-cooperative")
-// Specifies that no cooperative scheduling semantics may be used, even if the
-// current thread is itself cooperatively scheduled.  This means that
-// cooperative threads will NOT allow other cooperative threads to execute in
-// their place while waiting for a resource of this type.  Host operating system
-// semantics (e.g. a futex) may still be used.
-//
-// When optional, clients should strongly prefer SCHEDULE_COOPERATIVE_AND_KERNEL
-// by default.  SCHEDULE_KERNEL_ONLY should only be used for resources on which
-// base::scheduling (e.g. the implementation of a Scheduler) may depend.
-//
-// NOTE: Cooperative resources may not be nested below non-cooperative ones.
-// This means that it is invalid to to acquire a SCHEDULE_COOPERATIVE_AND_KERNEL
-// resource if a SCHEDULE_KERNEL_ONLY resource is already held.
-enum SchedulingMode {
-  SCHEDULE_KERNEL_ONLY = 0,         // Allow scheduling only the host OS.
-  SCHEDULE_COOPERATIVE_AND_KERNEL,  // Also allow cooperative scheduling.
-};
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/scoped_set_env.cc b/third_party/abseil_cpp/absl/base/internal/scoped_set_env.cc
deleted file mode 100644
index 8a934cb51191..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/scoped_set_env.cc
+++ /dev/null
@@ -1,81 +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.
-
-#include "absl/base/internal/scoped_set_env.h"
-
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-#include <cstdlib>
-
-#include "absl/base/internal/raw_logging.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-namespace {
-
-#ifdef _WIN32
-const int kMaxEnvVarValueSize = 1024;
-#endif
-
-void SetEnvVar(const char* name, const char* value) {
-#ifdef _WIN32
-  SetEnvironmentVariableA(name, value);
-#else
-  if (value == nullptr) {
-    ::unsetenv(name);
-  } else {
-    ::setenv(name, value, 1);
-  }
-#endif
-}
-
-}  // namespace
-
-ScopedSetEnv::ScopedSetEnv(const char* var_name, const char* new_value)
-    : var_name_(var_name), was_unset_(false) {
-#ifdef _WIN32
-  char buf[kMaxEnvVarValueSize];
-  auto get_res = GetEnvironmentVariableA(var_name_.c_str(), buf, sizeof(buf));
-  ABSL_INTERNAL_CHECK(get_res < sizeof(buf), "value exceeds buffer size");
-
-  if (get_res == 0) {
-    was_unset_ = (GetLastError() == ERROR_ENVVAR_NOT_FOUND);
-  } else {
-    old_value_.assign(buf, get_res);
-  }
-
-  SetEnvironmentVariableA(var_name_.c_str(), new_value);
-#else
-  const char* val = ::getenv(var_name_.c_str());
-  if (val == nullptr) {
-    was_unset_ = true;
-  } else {
-    old_value_ = val;
-  }
-#endif
-
-  SetEnvVar(var_name_.c_str(), new_value);
-}
-
-ScopedSetEnv::~ScopedSetEnv() {
-  SetEnvVar(var_name_.c_str(), was_unset_ ? nullptr : old_value_.c_str());
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/scoped_set_env.h b/third_party/abseil_cpp/absl/base/internal/scoped_set_env.h
deleted file mode 100644
index 19ec7b5d8a04..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/scoped_set_env.h
+++ /dev/null
@@ -1,45 +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_BASE_INTERNAL_SCOPED_SET_ENV_H_
-#define ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
-
-#include <string>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-class ScopedSetEnv {
- public:
-  ScopedSetEnv(const char* var_name, const char* new_value);
-  ~ScopedSetEnv();
-
- private:
-  std::string var_name_;
-  std::string old_value_;
-
-  // True if the environment variable was initially not set.
-  bool was_unset_;
-};
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/scoped_set_env_test.cc b/third_party/abseil_cpp/absl/base/internal/scoped_set_env_test.cc
deleted file mode 100644
index 5cbad246c647..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/scoped_set_env_test.cc
+++ /dev/null
@@ -1,99 +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.
-
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-#include "gtest/gtest.h"
-#include "absl/base/internal/scoped_set_env.h"
-
-namespace {
-
-using absl::base_internal::ScopedSetEnv;
-
-std::string GetEnvVar(const char* name) {
-#ifdef _WIN32
-  char buf[1024];
-  auto get_res = GetEnvironmentVariableA(name, buf, sizeof(buf));
-  if (get_res >= sizeof(buf)) {
-    return "TOO_BIG";
-  }
-
-  if (get_res == 0) {
-    return "UNSET";
-  }
-
-  return std::string(buf, get_res);
-#else
-  const char* val = ::getenv(name);
-  if (val == nullptr) {
-    return "UNSET";
-  }
-
-  return val;
-#endif
-}
-
-TEST(ScopedSetEnvTest, SetNonExistingVarToString) {
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
-
-  {
-    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
-
-    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
-  }
-
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
-}
-
-TEST(ScopedSetEnvTest, SetNonExistingVarToNull) {
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
-
-  {
-    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
-
-    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
-  }
-
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
-}
-
-TEST(ScopedSetEnvTest, SetExistingVarToString) {
-  ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
-
-  {
-    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "new_value");
-
-    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "new_value");
-  }
-
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
-}
-
-TEST(ScopedSetEnvTest, SetExistingVarToNull) {
-  ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
-
-  {
-    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
-
-    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
-  }
-
-  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock.cc b/third_party/abseil_cpp/absl/base/internal/spinlock.cc
deleted file mode 100644
index a7d44f3eb091..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock.cc
+++ /dev/null
@@ -1,220 +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/base/internal/spinlock.h"
-
-#include <algorithm>
-#include <atomic>
-#include <limits>
-
-#include "absl/base/attributes.h"
-#include "absl/base/internal/atomic_hook.h"
-#include "absl/base/internal/cycleclock.h"
-#include "absl/base/internal/spinlock_wait.h"
-#include "absl/base/internal/sysinfo.h" /* For NumCPUs() */
-#include "absl/base/call_once.h"
-
-// Description of lock-word:
-//  31..00: [............................3][2][1][0]
-//
-//     [0]: kSpinLockHeld
-//     [1]: kSpinLockCooperative
-//     [2]: kSpinLockDisabledScheduling
-// [31..3]: ONLY kSpinLockSleeper OR
-//          Wait time in cycles >> PROFILE_TIMESTAMP_SHIFT
-//
-// Detailed descriptions:
-//
-// Bit [0]: The lock is considered held iff kSpinLockHeld is set.
-//
-// Bit [1]: Eligible waiters (e.g. Fibers) may co-operatively reschedule when
-//          contended iff kSpinLockCooperative is set.
-//
-// Bit [2]: This bit is exclusive from bit [1].  It is used only by a
-//          non-cooperative lock.  When set, indicates that scheduling was
-//          successfully disabled when the lock was acquired.  May be unset,
-//          even if non-cooperative, if a ThreadIdentity did not yet exist at
-//          time of acquisition.
-//
-// Bit [3]: If this is the only upper bit ([31..3]) set then this lock was
-//          acquired without contention, however, at least one waiter exists.
-//
-//          Otherwise, bits [31..3] represent the time spent by the current lock
-//          holder to acquire the lock.  There may be outstanding waiter(s).
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static base_internal::AtomicHook<void (*)(
-    const void *lock, int64_t wait_cycles)>
-    submit_profile_data;
-
-void RegisterSpinLockProfiler(void (*fn)(const void *contendedlock,
-                                         int64_t wait_cycles)) {
-  submit_profile_data.Store(fn);
-}
-
-// Static member variable definitions.
-constexpr uint32_t SpinLock::kSpinLockHeld;
-constexpr uint32_t SpinLock::kSpinLockCooperative;
-constexpr uint32_t SpinLock::kSpinLockDisabledScheduling;
-constexpr uint32_t SpinLock::kSpinLockSleeper;
-constexpr uint32_t SpinLock::kWaitTimeMask;
-
-// Uncommon constructors.
-SpinLock::SpinLock(base_internal::SchedulingMode mode)
-    : lockword_(IsCooperative(mode) ? kSpinLockCooperative : 0) {
-  ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
-}
-
-// Monitor the lock to see if its value changes within some time period
-// (adaptive_spin_count loop iterations). The last value read from the lock
-// is returned from the method.
-uint32_t SpinLock::SpinLoop() {
-  // We are already in the slow path of SpinLock, initialize the
-  // adaptive_spin_count here.
-  ABSL_CONST_INIT static absl::once_flag init_adaptive_spin_count;
-  ABSL_CONST_INIT static int adaptive_spin_count = 0;
-  base_internal::LowLevelCallOnce(&init_adaptive_spin_count, []() {
-    adaptive_spin_count = base_internal::NumCPUs() > 1 ? 1000 : 1;
-  });
-
-  int c = adaptive_spin_count;
-  uint32_t lock_value;
-  do {
-    lock_value = lockword_.load(std::memory_order_relaxed);
-  } while ((lock_value & kSpinLockHeld) != 0 && --c > 0);
-  return lock_value;
-}
-
-void SpinLock::SlowLock() {
-  uint32_t lock_value = SpinLoop();
-  lock_value = TryLockInternal(lock_value, 0);
-  if ((lock_value & kSpinLockHeld) == 0) {
-    return;
-  }
-
-  base_internal::SchedulingMode scheduling_mode;
-  if ((lock_value & kSpinLockCooperative) != 0) {
-    scheduling_mode = base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL;
-  } else {
-    scheduling_mode = base_internal::SCHEDULE_KERNEL_ONLY;
-  }
-
-  // The lock was not obtained initially, so this thread needs to wait for
-  // it.  Record the current timestamp in the local variable wait_start_time
-  // so the total wait time can be stored in the lockword once this thread
-  // obtains the lock.
-  int64_t wait_start_time = CycleClock::Now();
-  uint32_t wait_cycles = 0;
-  int lock_wait_call_count = 0;
-  while ((lock_value & kSpinLockHeld) != 0) {
-    // If the lock is currently held, but not marked as having a sleeper, mark
-    // it as having a sleeper.
-    if ((lock_value & kWaitTimeMask) == 0) {
-      // Here, just "mark" that the thread is going to sleep.  Don't store the
-      // lock wait time in the lock as that will cause the current lock
-      // owner to think it experienced contention.
-      if (lockword_.compare_exchange_strong(
-              lock_value, lock_value | kSpinLockSleeper,
-              std::memory_order_relaxed, std::memory_order_relaxed)) {
-        // Successfully transitioned to kSpinLockSleeper.  Pass
-        // kSpinLockSleeper to the SpinLockWait routine to properly indicate
-        // the last lock_value observed.
-        lock_value |= kSpinLockSleeper;
-      } else if ((lock_value & kSpinLockHeld) == 0) {
-        // Lock is free again, so try and acquire it before sleeping.  The
-        // new lock state will be the number of cycles this thread waited if
-        // this thread obtains the lock.
-        lock_value = TryLockInternal(lock_value, wait_cycles);
-        continue;   // Skip the delay at the end of the loop.
-      }
-    }
-
-    // SpinLockDelay() calls into fiber scheduler, we need to see
-    // synchronization there to avoid false positives.
-    ABSL_TSAN_MUTEX_PRE_DIVERT(this, 0);
-    // Wait for an OS specific delay.
-    base_internal::SpinLockDelay(&lockword_, lock_value, ++lock_wait_call_count,
-                                 scheduling_mode);
-    ABSL_TSAN_MUTEX_POST_DIVERT(this, 0);
-    // Spin again after returning from the wait routine to give this thread
-    // some chance of obtaining the lock.
-    lock_value = SpinLoop();
-    wait_cycles = EncodeWaitCycles(wait_start_time, CycleClock::Now());
-    lock_value = TryLockInternal(lock_value, wait_cycles);
-  }
-}
-
-void SpinLock::SlowUnlock(uint32_t lock_value) {
-  base_internal::SpinLockWake(&lockword_,
-                              false);  // wake waiter if necessary
-
-  // If our acquisition was contended, collect contentionz profile info.  We
-  // reserve a unitary wait time to represent that a waiter exists without our
-  // own acquisition having been contended.
-  if ((lock_value & kWaitTimeMask) != kSpinLockSleeper) {
-    const uint64_t wait_cycles = DecodeWaitCycles(lock_value);
-    ABSL_TSAN_MUTEX_PRE_DIVERT(this, 0);
-    submit_profile_data(this, wait_cycles);
-    ABSL_TSAN_MUTEX_POST_DIVERT(this, 0);
-  }
-}
-
-// We use the upper 29 bits of the lock word to store the time spent waiting to
-// acquire this lock.  This is reported by contentionz profiling.  Since the
-// lower bits of the cycle counter wrap very quickly on high-frequency
-// processors we divide to reduce the granularity to 2^kProfileTimestampShift
-// sized units.  On a 4Ghz machine this will lose track of wait times greater
-// than (2^29/4 Ghz)*128 =~ 17.2 seconds.  Such waits should be extremely rare.
-static constexpr int kProfileTimestampShift = 7;
-
-// We currently reserve the lower 3 bits.
-static constexpr int kLockwordReservedShift = 3;
-
-uint32_t SpinLock::EncodeWaitCycles(int64_t wait_start_time,
-                                    int64_t wait_end_time) {
-  static const int64_t kMaxWaitTime =
-      std::numeric_limits<uint32_t>::max() >> kLockwordReservedShift;
-  int64_t scaled_wait_time =
-      (wait_end_time - wait_start_time) >> kProfileTimestampShift;
-
-  // Return a representation of the time spent waiting that can be stored in
-  // the lock word's upper bits.
-  uint32_t clamped = static_cast<uint32_t>(
-      std::min(scaled_wait_time, kMaxWaitTime) << kLockwordReservedShift);
-
-  if (clamped == 0) {
-    return kSpinLockSleeper;  // Just wake waiters, but don't record contention.
-  }
-  // Bump up value if necessary to avoid returning kSpinLockSleeper.
-  const uint32_t kMinWaitTime =
-      kSpinLockSleeper + (1 << kLockwordReservedShift);
-  if (clamped == kSpinLockSleeper) {
-    return kMinWaitTime;
-  }
-  return clamped;
-}
-
-uint64_t SpinLock::DecodeWaitCycles(uint32_t lock_value) {
-  // Cast to uint32_t first to ensure bits [63:32] are cleared.
-  const uint64_t scaled_wait_time =
-      static_cast<uint32_t>(lock_value & kWaitTimeMask);
-  return scaled_wait_time << (kProfileTimestampShift - kLockwordReservedShift);
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock.h b/third_party/abseil_cpp/absl/base/internal/spinlock.h
deleted file mode 100644
index e6ac9e6400b2..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock.h
+++ /dev/null
@@ -1,237 +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.
-//
-
-//  Most users requiring mutual exclusion should use Mutex.
-//  SpinLock is provided for use in three situations:
-//   - for use in code that Mutex itself depends on
-//   - to get a faster fast-path release under low contention (without an
-//     atomic read-modify-write) In return, SpinLock has worse behaviour under
-//     contention, which is why Mutex is preferred in most situations.
-//   - for async signal safety (see below)
-
-// SpinLock is async signal safe.  If a spinlock is used within a signal
-// handler, all code that acquires the lock must ensure that the signal cannot
-// arrive while they are holding the lock.  Typically, this is done by blocking
-// the signal.
-
-#ifndef ABSL_BASE_INTERNAL_SPINLOCK_H_
-#define ABSL_BASE_INTERNAL_SPINLOCK_H_
-
-#include <stdint.h>
-#include <sys/types.h>
-
-#include <atomic>
-
-#include "absl/base/attributes.h"
-#include "absl/base/const_init.h"
-#include "absl/base/dynamic_annotations.h"
-#include "absl/base/internal/low_level_scheduling.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/scheduling_mode.h"
-#include "absl/base/internal/tsan_mutex_interface.h"
-#include "absl/base/macros.h"
-#include "absl/base/port.h"
-#include "absl/base/thread_annotations.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-class ABSL_LOCKABLE SpinLock {
- public:
-  SpinLock() : lockword_(kSpinLockCooperative) {
-    ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
-  }
-
-  // Constructors that allow non-cooperative spinlocks to be created for use
-  // inside thread schedulers.  Normal clients should not use these.
-  explicit SpinLock(base_internal::SchedulingMode mode);
-
-  // Constructor for global SpinLock instances.  See absl/base/const_init.h.
-  constexpr SpinLock(absl::ConstInitType, base_internal::SchedulingMode mode)
-      : lockword_(IsCooperative(mode) ? kSpinLockCooperative : 0) {}
-
-  // For global SpinLock instances prefer trivial destructor when possible.
-  // Default but non-trivial destructor in some build configurations causes an
-  // extra static initializer.
-#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
-  ~SpinLock() { ABSL_TSAN_MUTEX_DESTROY(this, __tsan_mutex_not_static); }
-#else
-  ~SpinLock() = default;
-#endif
-
-  // Acquire this SpinLock.
-  inline void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() {
-    ABSL_TSAN_MUTEX_PRE_LOCK(this, 0);
-    if (!TryLockImpl()) {
-      SlowLock();
-    }
-    ABSL_TSAN_MUTEX_POST_LOCK(this, 0, 0);
-  }
-
-  // Try to acquire this SpinLock without blocking and return true if the
-  // acquisition was successful.  If the lock was not acquired, false is
-  // returned.  If this SpinLock is free at the time of the call, TryLock
-  // will return true with high probability.
-  inline bool TryLock() ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
-    ABSL_TSAN_MUTEX_PRE_LOCK(this, __tsan_mutex_try_lock);
-    bool res = TryLockImpl();
-    ABSL_TSAN_MUTEX_POST_LOCK(
-        this, __tsan_mutex_try_lock | (res ? 0 : __tsan_mutex_try_lock_failed),
-        0);
-    return res;
-  }
-
-  // Release this SpinLock, which must be held by the calling thread.
-  inline void Unlock() ABSL_UNLOCK_FUNCTION() {
-    ABSL_TSAN_MUTEX_PRE_UNLOCK(this, 0);
-    uint32_t lock_value = lockword_.load(std::memory_order_relaxed);
-    lock_value = lockword_.exchange(lock_value & kSpinLockCooperative,
-                                    std::memory_order_release);
-
-    if ((lock_value & kSpinLockDisabledScheduling) != 0) {
-      base_internal::SchedulingGuard::EnableRescheduling(true);
-    }
-    if ((lock_value & kWaitTimeMask) != 0) {
-      // Collect contentionz profile info, and speed the wakeup of any waiter.
-      // The wait_cycles value indicates how long this thread spent waiting
-      // for the lock.
-      SlowUnlock(lock_value);
-    }
-    ABSL_TSAN_MUTEX_POST_UNLOCK(this, 0);
-  }
-
-  // Determine if the lock is held.  When the lock is held by the invoking
-  // thread, true will always be returned. Intended to be used as
-  // CHECK(lock.IsHeld()).
-  inline bool IsHeld() const {
-    return (lockword_.load(std::memory_order_relaxed) & kSpinLockHeld) != 0;
-  }
-
- protected:
-  // These should not be exported except for testing.
-
-  // Store number of cycles between wait_start_time and wait_end_time in a
-  // lock value.
-  static uint32_t EncodeWaitCycles(int64_t wait_start_time,
-                                   int64_t wait_end_time);
-
-  // Extract number of wait cycles in a lock value.
-  static uint64_t DecodeWaitCycles(uint32_t lock_value);
-
-  // Provide access to protected method above.  Use for testing only.
-  friend struct SpinLockTest;
-
- private:
-  // lockword_ is used to store the following:
-  //
-  // bit[0] encodes whether a lock is being held.
-  // bit[1] encodes whether a lock uses cooperative scheduling.
-  // bit[2] encodes whether a lock disables scheduling.
-  // bit[3:31] encodes time a lock spent on waiting as a 29-bit unsigned int.
-  static constexpr uint32_t kSpinLockHeld = 1;
-  static constexpr uint32_t kSpinLockCooperative = 2;
-  static constexpr uint32_t kSpinLockDisabledScheduling = 4;
-  static constexpr uint32_t kSpinLockSleeper = 8;
-  // Includes kSpinLockSleeper.
-  static constexpr uint32_t kWaitTimeMask =
-      ~(kSpinLockHeld | kSpinLockCooperative | kSpinLockDisabledScheduling);
-
-  // Returns true if the provided scheduling mode is cooperative.
-  static constexpr bool IsCooperative(
-      base_internal::SchedulingMode scheduling_mode) {
-    return scheduling_mode == base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL;
-  }
-
-  uint32_t TryLockInternal(uint32_t lock_value, uint32_t wait_cycles);
-  void SlowLock() ABSL_ATTRIBUTE_COLD;
-  void SlowUnlock(uint32_t lock_value) ABSL_ATTRIBUTE_COLD;
-  uint32_t SpinLoop();
-
-  inline bool TryLockImpl() {
-    uint32_t lock_value = lockword_.load(std::memory_order_relaxed);
-    return (TryLockInternal(lock_value, 0) & kSpinLockHeld) == 0;
-  }
-
-  std::atomic<uint32_t> lockword_;
-
-  SpinLock(const SpinLock&) = delete;
-  SpinLock& operator=(const SpinLock&) = delete;
-};
-
-// Corresponding locker object that arranges to acquire a spinlock for
-// the duration of a C++ scope.
-class ABSL_SCOPED_LOCKABLE SpinLockHolder {
- public:
-  inline explicit SpinLockHolder(SpinLock* l) ABSL_EXCLUSIVE_LOCK_FUNCTION(l)
-      : lock_(l) {
-    l->Lock();
-  }
-  inline ~SpinLockHolder() ABSL_UNLOCK_FUNCTION() { lock_->Unlock(); }
-
-  SpinLockHolder(const SpinLockHolder&) = delete;
-  SpinLockHolder& operator=(const SpinLockHolder&) = delete;
-
- private:
-  SpinLock* lock_;
-};
-
-// Register a hook for profiling support.
-//
-// The function pointer registered here will be called whenever a spinlock is
-// contended.  The callback is given an opaque handle to the contended spinlock
-// and the number of wait cycles.  This is thread-safe, but only a single
-// profiler can be registered.  It is an error to call this function multiple
-// times with different arguments.
-void RegisterSpinLockProfiler(void (*fn)(const void* lock,
-                                         int64_t wait_cycles));
-
-//------------------------------------------------------------------------------
-// Public interface ends here.
-//------------------------------------------------------------------------------
-
-// If (result & kSpinLockHeld) == 0, then *this was successfully locked.
-// Otherwise, returns last observed value for lockword_.
-inline uint32_t SpinLock::TryLockInternal(uint32_t lock_value,
-                                          uint32_t wait_cycles) {
-  if ((lock_value & kSpinLockHeld) != 0) {
-    return lock_value;
-  }
-
-  uint32_t sched_disabled_bit = 0;
-  if ((lock_value & kSpinLockCooperative) == 0) {
-    // For non-cooperative locks we must make sure we mark ourselves as
-    // non-reschedulable before we attempt to CompareAndSwap.
-    if (base_internal::SchedulingGuard::DisableRescheduling()) {
-      sched_disabled_bit = kSpinLockDisabledScheduling;
-    }
-  }
-
-  if (!lockword_.compare_exchange_strong(
-          lock_value,
-          kSpinLockHeld | lock_value | wait_cycles | sched_disabled_bit,
-          std::memory_order_acquire, std::memory_order_relaxed)) {
-    base_internal::SchedulingGuard::EnableRescheduling(sched_disabled_bit != 0);
-  }
-
-  return lock_value;
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_SPINLOCK_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc b/third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc
deleted file mode 100644
index bc468940fc5d..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc
+++ /dev/null
@@ -1,35 +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.
-//
-// This file is an Akaros-specific part of spinlock_wait.cc
-
-#include <atomic>
-
-#include "absl/base/internal/scheduling_mode.h"
-
-extern "C" {
-
-ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
-    std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */,
-    int /* loop */, absl::base_internal::SchedulingMode /* mode */) {
-  // In Akaros, one must take care not to call anything that could cause a
-  // malloc(), a blocking system call, or a uthread_yield() while holding a
-  // spinlock. Our callers assume will not call into libraries or other
-  // arbitrary code.
-}
-
-ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(
-    std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
-
-}  // extern "C"
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_benchmark.cc b/third_party/abseil_cpp/absl/base/internal/spinlock_benchmark.cc
deleted file mode 100644
index 0451c65f9559..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock_benchmark.cc
+++ /dev/null
@@ -1,52 +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.
-
-// See also //absl/synchronization:mutex_benchmark for a comparison of SpinLock
-// and Mutex performance under varying levels of contention.
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/scheduling_mode.h"
-#include "absl/base/internal/spinlock.h"
-#include "absl/synchronization/internal/create_thread_identity.h"
-#include "benchmark/benchmark.h"
-
-namespace {
-
-template <absl::base_internal::SchedulingMode scheduling_mode>
-static void BM_SpinLock(benchmark::State& state) {
-  // Ensure a ThreadIdentity is installed.
-  ABSL_INTERNAL_CHECK(
-      absl::synchronization_internal::GetOrCreateCurrentThreadIdentity() !=
-          nullptr,
-      "GetOrCreateCurrentThreadIdentity() failed");
-
-  static auto* spinlock = new absl::base_internal::SpinLock(scheduling_mode);
-  for (auto _ : state) {
-    absl::base_internal::SpinLockHolder holder(spinlock);
-  }
-}
-
-BENCHMARK_TEMPLATE(BM_SpinLock,
-                   absl::base_internal::SCHEDULE_KERNEL_ONLY)
-    ->UseRealTime()
-    ->Threads(1)
-    ->ThreadPerCpu();
-
-BENCHMARK_TEMPLATE(BM_SpinLock,
-                   absl::base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL)
-    ->UseRealTime()
-    ->Threads(1)
-    ->ThreadPerCpu();
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_linux.inc b/third_party/abseil_cpp/absl/base/internal/spinlock_linux.inc
deleted file mode 100644
index e31c6ed477c0..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock_linux.inc
+++ /dev/null
@@ -1,74 +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.
-//
-// This file is a Linux-specific part of spinlock_wait.cc
-
-#include <linux/futex.h>
-#include <sys/syscall.h>
-#include <unistd.h>
-
-#include <atomic>
-#include <climits>
-#include <cstdint>
-#include <ctime>
-
-#include "absl/base/attributes.h"
-#include "absl/base/internal/errno_saver.h"
-
-// The SpinLock lockword is `std::atomic<uint32_t>`. Here we assert that
-// `std::atomic<uint32_t>` is bitwise equivalent of the `int` expected
-// by SYS_futex. We also assume that reads/writes done to the lockword
-// by SYS_futex have rational semantics with regard to the
-// std::atomic<> API. C++ provides no guarantees of these assumptions,
-// but they are believed to hold in practice.
-static_assert(sizeof(std::atomic<uint32_t>) == sizeof(int),
-              "SpinLock lockword has the wrong size for a futex");
-
-// Some Android headers are missing these definitions even though they
-// support these futex operations.
-#ifdef __BIONIC__
-#ifndef SYS_futex
-#define SYS_futex __NR_futex
-#endif
-#ifndef FUTEX_PRIVATE_FLAG
-#define FUTEX_PRIVATE_FLAG 128
-#endif
-#endif
-
-#if defined(__NR_futex_time64) && !defined(SYS_futex_time64)
-#define SYS_futex_time64 __NR_futex_time64
-#endif
-
-#if defined(SYS_futex_time64) && !defined(SYS_futex)
-#define SYS_futex SYS_futex_time64
-#endif
-
-extern "C" {
-
-ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
-    std::atomic<uint32_t> *w, uint32_t value, int loop,
-    absl::base_internal::SchedulingMode) {
-  absl::base_internal::ErrnoSaver errno_saver;
-  struct timespec tm;
-  tm.tv_sec = 0;
-  tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
-  syscall(SYS_futex, w, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, value, &tm);
-}
-
-ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(std::atomic<uint32_t> *w,
-                                                  bool all) {
-  syscall(SYS_futex, w, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, all ? INT_MAX : 1, 0);
-}
-
-}  // extern "C"
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_posix.inc b/third_party/abseil_cpp/absl/base/internal/spinlock_posix.inc
deleted file mode 100644
index fcd21b151b6e..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock_posix.inc
+++ /dev/null
@@ -1,46 +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.
-//
-// This file is a Posix-specific part of spinlock_wait.cc
-
-#include <sched.h>
-
-#include <atomic>
-#include <ctime>
-
-#include "absl/base/internal/errno_saver.h"
-#include "absl/base/internal/scheduling_mode.h"
-#include "absl/base/port.h"
-
-extern "C" {
-
-ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
-    std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop,
-    absl::base_internal::SchedulingMode /* mode */) {
-  absl::base_internal::ErrnoSaver errno_saver;
-  if (loop == 0) {
-  } else if (loop == 1) {
-    sched_yield();
-  } else {
-    struct timespec tm;
-    tm.tv_sec = 0;
-    tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
-    nanosleep(&tm, nullptr);
-  }
-}
-
-ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(
-    std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
-
-}  // extern "C"
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_wait.cc b/third_party/abseil_cpp/absl/base/internal/spinlock_wait.cc
deleted file mode 100644
index fa824be1c008..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock_wait.cc
+++ /dev/null
@@ -1,81 +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.
-
-// The OS-specific header included below must provide two calls:
-// AbslInternalSpinLockDelay() and AbslInternalSpinLockWake().
-// See spinlock_wait.h for the specs.
-
-#include <atomic>
-#include <cstdint>
-
-#include "absl/base/internal/spinlock_wait.h"
-
-#if defined(_WIN32)
-#include "absl/base/internal/spinlock_win32.inc"
-#elif defined(__linux__)
-#include "absl/base/internal/spinlock_linux.inc"
-#elif defined(__akaros__)
-#include "absl/base/internal/spinlock_akaros.inc"
-#else
-#include "absl/base/internal/spinlock_posix.inc"
-#endif
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// See spinlock_wait.h for spec.
-uint32_t SpinLockWait(std::atomic<uint32_t> *w, int n,
-                      const SpinLockWaitTransition trans[],
-                      base_internal::SchedulingMode scheduling_mode) {
-  int loop = 0;
-  for (;;) {
-    uint32_t v = w->load(std::memory_order_acquire);
-    int i;
-    for (i = 0; i != n && v != trans[i].from; i++) {
-    }
-    if (i == n) {
-      SpinLockDelay(w, v, ++loop, scheduling_mode);  // no matching transition
-    } else if (trans[i].to == v ||                   // null transition
-               w->compare_exchange_strong(v, trans[i].to,
-                                          std::memory_order_acquire,
-                                          std::memory_order_relaxed)) {
-      if (trans[i].done) return v;
-    }
-  }
-}
-
-static std::atomic<uint64_t> delay_rand;
-
-// Return a suggested delay in nanoseconds for iteration number "loop"
-int SpinLockSuggestedDelayNS(int loop) {
-  // Weak pseudo-random number generator to get some spread between threads
-  // when many are spinning.
-  uint64_t r = delay_rand.load(std::memory_order_relaxed);
-  r = 0x5deece66dLL * r + 0xb;   // numbers from nrand48()
-  delay_rand.store(r, std::memory_order_relaxed);
-
-  if (loop < 0 || loop > 32) {   // limit loop to 0..32
-    loop = 32;
-  }
-  const int kMinDelay = 128 << 10;  // 128us
-  // Double delay every 8 iterations, up to 16x (2ms).
-  int delay = kMinDelay << (loop / 8);
-  // Randomize in delay..2*delay range, for resulting 128us..4ms range.
-  return delay | ((delay - 1) & static_cast<int>(r));
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_wait.h b/third_party/abseil_cpp/absl/base/internal/spinlock_wait.h
deleted file mode 100644
index 169bc749fbc5..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock_wait.h
+++ /dev/null
@@ -1,93 +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_BASE_INTERNAL_SPINLOCK_WAIT_H_
-#define ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_
-
-// Operations to make atomic transitions on a word, and to allow
-// waiting for those transitions to become possible.
-
-#include <stdint.h>
-#include <atomic>
-
-#include "absl/base/internal/scheduling_mode.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// SpinLockWait() waits until it can perform one of several transitions from
-// "from" to "to".  It returns when it performs a transition where done==true.
-struct SpinLockWaitTransition {
-  uint32_t from;
-  uint32_t to;
-  bool done;
-};
-
-// Wait until *w can transition from trans[i].from to trans[i].to for some i
-// satisfying 0<=i<n && trans[i].done, atomically make the transition,
-// then return the old value of *w.   Make any other atomic transitions
-// where !trans[i].done, but continue waiting.
-uint32_t SpinLockWait(std::atomic<uint32_t> *w, int n,
-                      const SpinLockWaitTransition trans[],
-                      SchedulingMode scheduling_mode);
-
-// If possible, wake some thread that has called SpinLockDelay(w, ...). If
-// "all" is true, wake all such threads.  This call is a hint, and on some
-// systems it may be a no-op; threads calling SpinLockDelay() will always wake
-// eventually even if SpinLockWake() is never called.
-void SpinLockWake(std::atomic<uint32_t> *w, bool all);
-
-// Wait for an appropriate spin delay on iteration "loop" of a
-// spin loop on location *w, whose previously observed value was "value".
-// SpinLockDelay() may do nothing, may yield the CPU, may sleep a clock tick,
-// or may wait for a delay that can be truncated by a call to SpinLockWake(w).
-// In all cases, it must return in bounded time even if SpinLockWake() is not
-// called.
-void SpinLockDelay(std::atomic<uint32_t> *w, uint32_t value, int loop,
-                   base_internal::SchedulingMode scheduling_mode);
-
-// Helper used by AbslInternalSpinLockDelay.
-// Returns a suggested delay in nanoseconds for iteration number "loop".
-int SpinLockSuggestedDelayNS(int loop);
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-// In some build configurations we pass --detect-odr-violations to the
-// gold linker.  This causes it to flag weak symbol overrides as ODR
-// violations.  Because ODR only applies to C++ and not C,
-// --detect-odr-violations ignores symbols not mangled with C++ names.
-// By changing our extension points to be extern "C", we dodge this
-// check.
-extern "C" {
-void AbslInternalSpinLockWake(std::atomic<uint32_t> *w, bool all);
-void AbslInternalSpinLockDelay(
-    std::atomic<uint32_t> *w, uint32_t value, int loop,
-    absl::base_internal::SchedulingMode scheduling_mode);
-}
-
-inline void absl::base_internal::SpinLockWake(std::atomic<uint32_t> *w,
-                                              bool all) {
-  AbslInternalSpinLockWake(w, all);
-}
-
-inline void absl::base_internal::SpinLockDelay(
-    std::atomic<uint32_t> *w, uint32_t value, int loop,
-    absl::base_internal::SchedulingMode scheduling_mode) {
-  AbslInternalSpinLockDelay(w, value, loop, scheduling_mode);
-}
-
-#endif  // ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_win32.inc b/third_party/abseil_cpp/absl/base/internal/spinlock_win32.inc
deleted file mode 100644
index 78654b5b5966..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/spinlock_win32.inc
+++ /dev/null
@@ -1,37 +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.
-//
-// This file is a Win32-specific part of spinlock_wait.cc
-
-#include <windows.h>
-#include <atomic>
-#include "absl/base/internal/scheduling_mode.h"
-
-extern "C" {
-
-void AbslInternalSpinLockDelay(std::atomic<uint32_t>* /* lock_word */,
-                               uint32_t /* value */, int loop,
-                               absl::base_internal::SchedulingMode /* mode */) {
-  if (loop == 0) {
-  } else if (loop == 1) {
-    Sleep(0);
-  } else {
-    Sleep(absl::base_internal::SpinLockSuggestedDelayNS(loop) / 1000000);
-  }
-}
-
-void AbslInternalSpinLockWake(std::atomic<uint32_t>* /* lock_word */,
-                              bool /* all */) {}
-
-}  // extern "C"
diff --git a/third_party/abseil_cpp/absl/base/internal/strerror.cc b/third_party/abseil_cpp/absl/base/internal/strerror.cc
deleted file mode 100644
index d66ba1201135..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/strerror.cc
+++ /dev/null
@@ -1,88 +0,0 @@
-// Copyright 2020 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/base/internal/strerror.h"
-
-#include <array>
-#include <cerrno>
-#include <cstddef>
-#include <cstdio>
-#include <cstring>
-#include <string>
-#include <type_traits>
-
-#include "absl/base/internal/errno_saver.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-namespace {
-
-const char* StrErrorAdaptor(int errnum, char* buf, size_t buflen) {
-#if defined(_WIN32)
-  int rc = strerror_s(buf, buflen, errnum);
-  buf[buflen - 1] = '\0';  // guarantee NUL termination
-  if (rc == 0 && strncmp(buf, "Unknown error", buflen) == 0) *buf = '\0';
-  return buf;
-#else
-  // The type of `ret` is platform-specific; both of these branches must compile
-  // either way but only one will execute on any given platform:
-  auto ret = strerror_r(errnum, buf, buflen);
-  if (std::is_same<decltype(ret), int>::value) {
-    // XSI `strerror_r`; `ret` is `int`:
-    if (ret) *buf = '\0';
-    return buf;
-  } else {
-    // GNU `strerror_r`; `ret` is `char *`:
-    return reinterpret_cast<const char*>(ret);
-  }
-#endif
-}
-
-std::string StrErrorInternal(int errnum) {
-  absl::base_internal::ErrnoSaver errno_saver;
-  char buf[100];
-  const char* str = StrErrorAdaptor(errnum, buf, sizeof buf);
-  if (*str == '\0') {
-    snprintf(buf, sizeof buf, "Unknown error %d", errnum);
-    str = buf;
-  }
-  return str;
-}
-
-// kSysNerr is the number of errors from a recent glibc. `StrError()` falls back
-// to `StrErrorAdaptor()` if the value is larger than this.
-constexpr int kSysNerr = 135;
-
-std::array<std::string, kSysNerr>* NewStrErrorTable() {
-  auto* table = new std::array<std::string, kSysNerr>;
-  for (int i = 0; i < static_cast<int>(table->size()); ++i) {
-    (*table)[i] = StrErrorInternal(i);
-  }
-  return table;
-}
-
-}  // namespace
-
-std::string StrError(int errnum) {
-  static const auto* table = NewStrErrorTable();
-  if (errnum >= 0 && errnum < static_cast<int>(table->size())) {
-    return (*table)[errnum];
-  }
-  return StrErrorInternal(errnum);
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/strerror.h b/third_party/abseil_cpp/absl/base/internal/strerror.h
deleted file mode 100644
index 350097366eed..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/strerror.h
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright 2020 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_BASE_INTERNAL_STRERROR_H_
-#define ABSL_BASE_INTERNAL_STRERROR_H_
-
-#include <string>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// A portable and thread-safe alternative to C89's `strerror`.
-//
-// The C89 specification of `strerror` is not suitable for use in a
-// multi-threaded application as the returned string may be changed by calls to
-// `strerror` from another thread.  The many non-stdlib alternatives differ
-// enough in their names, availability, and semantics to justify this wrapper
-// around them.  `errno` will not be modified by a call to `absl::StrError`.
-std::string StrError(int errnum);
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_STRERROR_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/strerror_benchmark.cc b/third_party/abseil_cpp/absl/base/internal/strerror_benchmark.cc
deleted file mode 100644
index c9ab14a89dbb..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/strerror_benchmark.cc
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright 2020 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 <cerrno>
-#include <cstdio>
-#include <string>
-
-#include "absl/base/internal/strerror.h"
-#include "benchmark/benchmark.h"
-
-namespace {
-void BM_AbslStrError(benchmark::State& state) {
-  for (auto _ : state) {
-    benchmark::DoNotOptimize(absl::base_internal::StrError(ERANGE));
-  }
-}
-BENCHMARK(BM_AbslStrError);
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/strerror_test.cc b/third_party/abseil_cpp/absl/base/internal/strerror_test.cc
deleted file mode 100644
index a53da97f92c9..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/strerror_test.cc
+++ /dev/null
@@ -1,86 +0,0 @@
-// Copyright 2020 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/base/internal/strerror.h"
-
-#include <atomic>
-#include <cerrno>
-#include <cstdio>
-#include <cstring>
-#include <string>
-#include <thread>  // NOLINT(build/c++11)
-#include <vector>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/strings/match.h"
-
-namespace {
-using ::testing::AnyOf;
-using ::testing::Eq;
-
-TEST(StrErrorTest, ValidErrorCode) {
-  errno = ERANGE;
-  EXPECT_THAT(absl::base_internal::StrError(EDOM), Eq(strerror(EDOM)));
-  EXPECT_THAT(errno, Eq(ERANGE));
-}
-
-TEST(StrErrorTest, InvalidErrorCode) {
-  errno = ERANGE;
-  EXPECT_THAT(absl::base_internal::StrError(-1),
-              AnyOf(Eq("No error information"), Eq("Unknown error -1")));
-  EXPECT_THAT(errno, Eq(ERANGE));
-}
-
-TEST(StrErrorTest, MultipleThreads) {
-  // In this test, we will start up 2 threads and have each one call
-  // StrError 1000 times, each time with a different errnum.  We
-  // expect that StrError(errnum) will return a string equal to the
-  // one returned by strerror(errnum), if the code is known.  Since
-  // strerror is known to be thread-hostile, collect all the expected
-  // strings up front.
-  const int kNumCodes = 1000;
-  std::vector<std::string> expected_strings(kNumCodes);
-  for (int i = 0; i < kNumCodes; ++i) {
-    expected_strings[i] = strerror(i);
-  }
-
-  std::atomic_int counter(0);
-  auto thread_fun = [&]() {
-    for (int i = 0; i < kNumCodes; ++i) {
-      ++counter;
-      errno = ERANGE;
-      const std::string value = absl::base_internal::StrError(i);
-      // Only the GNU implementation is guaranteed to provide the
-      // string "Unknown error nnn". POSIX doesn't say anything.
-      if (!absl::StartsWith(value, "Unknown error ")) {
-        EXPECT_THAT(absl::base_internal::StrError(i), Eq(expected_strings[i]));
-      }
-      EXPECT_THAT(errno, Eq(ERANGE));
-    }
-  };
-
-  const int kNumThreads = 100;
-  std::vector<std::thread> threads;
-  for (int i = 0; i < kNumThreads; ++i) {
-    threads.push_back(std::thread(thread_fun));
-  }
-  for (auto& thread : threads) {
-    thread.join();
-  }
-
-  EXPECT_THAT(counter, Eq(kNumThreads * kNumCodes));
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/sysinfo.cc b/third_party/abseil_cpp/absl/base/internal/sysinfo.cc
deleted file mode 100644
index 4a3b205034a7..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/sysinfo.cc
+++ /dev/null
@@ -1,439 +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/base/internal/sysinfo.h"
-
-#include "absl/base/attributes.h"
-
-#ifdef _WIN32
-#include <windows.h>
-#else
-#include <fcntl.h>
-#include <pthread.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-#endif
-
-#ifdef __linux__
-#include <sys/syscall.h>
-#endif
-
-#if defined(__APPLE__) || defined(__FreeBSD__)
-#include <sys/sysctl.h>
-#endif
-
-#if defined(__myriad2__)
-#include <rtems.h>
-#endif
-
-#include <string.h>
-
-#include <cassert>
-#include <cstdint>
-#include <cstdio>
-#include <cstdlib>
-#include <ctime>
-#include <limits>
-#include <thread>  // NOLINT(build/c++11)
-#include <utility>
-#include <vector>
-
-#include "absl/base/call_once.h"
-#include "absl/base/config.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/spinlock.h"
-#include "absl/base/internal/unscaledcycleclock.h"
-#include "absl/base/thread_annotations.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-static int GetNumCPUs() {
-#if defined(__myriad2__)
-  return 1;
-#else
-  // Other possibilities:
-  //  - Read /sys/devices/system/cpu/online and use cpumask_parse()
-  //  - sysconf(_SC_NPROCESSORS_ONLN)
-  return std::thread::hardware_concurrency();
-#endif
-}
-
-#if defined(_WIN32)
-
-static double GetNominalCPUFrequency() {
-#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
-    !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
-  // UWP apps don't have access to the registry and currently don't provide an
-  // API informing about CPU nominal frequency.
-  return 1.0;
-#else
-#pragma comment(lib, "advapi32.lib")  // For Reg* functions.
-  HKEY key;
-  // Use the Reg* functions rather than the SH functions because shlwapi.dll
-  // pulls in gdi32.dll which makes process destruction much more costly.
-  if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,
-                    "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", 0,
-                    KEY_READ, &key) == ERROR_SUCCESS) {
-    DWORD type = 0;
-    DWORD data = 0;
-    DWORD data_size = sizeof(data);
-    auto result = RegQueryValueExA(key, "~MHz", 0, &type,
-                                   reinterpret_cast<LPBYTE>(&data), &data_size);
-    RegCloseKey(key);
-    if (result == ERROR_SUCCESS && type == REG_DWORD &&
-        data_size == sizeof(data)) {
-      return data * 1e6;  // Value is MHz.
-    }
-  }
-  return 1.0;
-#endif  // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP
-}
-
-#elif defined(CTL_HW) && defined(HW_CPU_FREQ)
-
-static double GetNominalCPUFrequency() {
-  unsigned freq;
-  size_t size = sizeof(freq);
-  int mib[2] = {CTL_HW, HW_CPU_FREQ};
-  if (sysctl(mib, 2, &freq, &size, nullptr, 0) == 0) {
-    return static_cast<double>(freq);
-  }
-  return 1.0;
-}
-
-#else
-
-// Helper function for reading a long from a file. Returns true if successful
-// and the memory location pointed to by value is set to the value read.
-static bool ReadLongFromFile(const char *file, long *value) {
-  bool ret = false;
-  int fd = open(file, O_RDONLY);
-  if (fd != -1) {
-    char line[1024];
-    char *err;
-    memset(line, '\0', sizeof(line));
-    int len = read(fd, line, sizeof(line) - 1);
-    if (len <= 0) {
-      ret = false;
-    } else {
-      const long temp_value = strtol(line, &err, 10);
-      if (line[0] != '\0' && (*err == '\n' || *err == '\0')) {
-        *value = temp_value;
-        ret = true;
-      }
-    }
-    close(fd);
-  }
-  return ret;
-}
-
-#if defined(ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY)
-
-// Reads a monotonic time source and returns a value in
-// nanoseconds. The returned value uses an arbitrary epoch, not the
-// Unix epoch.
-static int64_t ReadMonotonicClockNanos() {
-  struct timespec t;
-#ifdef CLOCK_MONOTONIC_RAW
-  int rc = clock_gettime(CLOCK_MONOTONIC_RAW, &t);
-#else
-  int rc = clock_gettime(CLOCK_MONOTONIC, &t);
-#endif
-  if (rc != 0) {
-    perror("clock_gettime() failed");
-    abort();
-  }
-  return int64_t{t.tv_sec} * 1000000000 + t.tv_nsec;
-}
-
-class UnscaledCycleClockWrapperForInitializeFrequency {
- public:
-  static int64_t Now() { return base_internal::UnscaledCycleClock::Now(); }
-};
-
-struct TimeTscPair {
-  int64_t time;  // From ReadMonotonicClockNanos().
-  int64_t tsc;   // From UnscaledCycleClock::Now().
-};
-
-// Returns a pair of values (monotonic kernel time, TSC ticks) that
-// approximately correspond to each other.  This is accomplished by
-// doing several reads and picking the reading with the lowest
-// latency.  This approach is used to minimize the probability that
-// our thread was preempted between clock reads.
-static TimeTscPair GetTimeTscPair() {
-  int64_t best_latency = std::numeric_limits<int64_t>::max();
-  TimeTscPair best;
-  for (int i = 0; i < 10; ++i) {
-    int64_t t0 = ReadMonotonicClockNanos();
-    int64_t tsc = UnscaledCycleClockWrapperForInitializeFrequency::Now();
-    int64_t t1 = ReadMonotonicClockNanos();
-    int64_t latency = t1 - t0;
-    if (latency < best_latency) {
-      best_latency = latency;
-      best.time = t0;
-      best.tsc = tsc;
-    }
-  }
-  return best;
-}
-
-// Measures and returns the TSC frequency by taking a pair of
-// measurements approximately `sleep_nanoseconds` apart.
-static double MeasureTscFrequencyWithSleep(int sleep_nanoseconds) {
-  auto t0 = GetTimeTscPair();
-  struct timespec ts;
-  ts.tv_sec = 0;
-  ts.tv_nsec = sleep_nanoseconds;
-  while (nanosleep(&ts, &ts) != 0 && errno == EINTR) {}
-  auto t1 = GetTimeTscPair();
-  double elapsed_ticks = t1.tsc - t0.tsc;
-  double elapsed_time = (t1.time - t0.time) * 1e-9;
-  return elapsed_ticks / elapsed_time;
-}
-
-// Measures and returns the TSC frequency by calling
-// MeasureTscFrequencyWithSleep(), doubling the sleep interval until the
-// frequency measurement stabilizes.
-static double MeasureTscFrequency() {
-  double last_measurement = -1.0;
-  int sleep_nanoseconds = 1000000;  // 1 millisecond.
-  for (int i = 0; i < 8; ++i) {
-    double measurement = MeasureTscFrequencyWithSleep(sleep_nanoseconds);
-    if (measurement * 0.99 < last_measurement &&
-        last_measurement < measurement * 1.01) {
-      // Use the current measurement if it is within 1% of the
-      // previous measurement.
-      return measurement;
-    }
-    last_measurement = measurement;
-    sleep_nanoseconds *= 2;
-  }
-  return last_measurement;
-}
-
-#endif  // ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
-
-static double GetNominalCPUFrequency() {
-  long freq = 0;
-
-  // Google's production kernel has a patch to export the TSC
-  // frequency through sysfs. If the kernel is exporting the TSC
-  // frequency use that. There are issues where cpuinfo_max_freq
-  // cannot be relied on because the BIOS may be exporting an invalid
-  // p-state (on x86) or p-states may be used to put the processor in
-  // a new mode (turbo mode). Essentially, those frequencies cannot
-  // always be relied upon. The same reasons apply to /proc/cpuinfo as
-  // well.
-  if (ReadLongFromFile("/sys/devices/system/cpu/cpu0/tsc_freq_khz", &freq)) {
-    return freq * 1e3;  // Value is kHz.
-  }
-
-#if defined(ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY)
-  // On these platforms, the TSC frequency is the nominal CPU
-  // frequency.  But without having the kernel export it directly
-  // though /sys/devices/system/cpu/cpu0/tsc_freq_khz, there is no
-  // other way to reliably get the TSC frequency, so we have to
-  // measure it ourselves.  Some CPUs abuse cpuinfo_max_freq by
-  // exporting "fake" frequencies for implementing new features. For
-  // example, Intel's turbo mode is enabled by exposing a p-state
-  // value with a higher frequency than that of the real TSC
-  // rate. Because of this, we prefer to measure the TSC rate
-  // ourselves on i386 and x86-64.
-  return MeasureTscFrequency();
-#else
-
-  // If CPU scaling is in effect, we want to use the *maximum*
-  // frequency, not whatever CPU speed some random processor happens
-  // to be using now.
-  if (ReadLongFromFile("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq",
-                       &freq)) {
-    return freq * 1e3;  // Value is kHz.
-  }
-
-  return 1.0;
-#endif  // !ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
-}
-
-#endif
-
-ABSL_CONST_INIT static once_flag init_num_cpus_once;
-ABSL_CONST_INIT static int num_cpus = 0;
-
-// NumCPUs() may be called before main() and before malloc is properly
-// initialized, therefore this must not allocate memory.
-int NumCPUs() {
-  base_internal::LowLevelCallOnce(
-      &init_num_cpus_once, []() { num_cpus = GetNumCPUs(); });
-  return num_cpus;
-}
-
-// A default frequency of 0.0 might be dangerous if it is used in division.
-ABSL_CONST_INIT static once_flag init_nominal_cpu_frequency_once;
-ABSL_CONST_INIT static double nominal_cpu_frequency = 1.0;
-
-// NominalCPUFrequency() may be called before main() and before malloc is
-// properly initialized, therefore this must not allocate memory.
-double NominalCPUFrequency() {
-  base_internal::LowLevelCallOnce(
-      &init_nominal_cpu_frequency_once,
-      []() { nominal_cpu_frequency = GetNominalCPUFrequency(); });
-  return nominal_cpu_frequency;
-}
-
-#if defined(_WIN32)
-
-pid_t GetTID() {
-  return pid_t{GetCurrentThreadId()};
-}
-
-#elif defined(__linux__)
-
-#ifndef SYS_gettid
-#define SYS_gettid __NR_gettid
-#endif
-
-pid_t GetTID() {
-  return syscall(SYS_gettid);
-}
-
-#elif defined(__akaros__)
-
-pid_t GetTID() {
-  // Akaros has a concept of "vcore context", which is the state the program
-  // is forced into when we need to make a user-level scheduling decision, or
-  // run a signal handler.  This is analogous to the interrupt context that a
-  // CPU might enter if it encounters some kind of exception.
-  //
-  // There is no current thread context in vcore context, but we need to give
-  // a reasonable answer if asked for a thread ID (e.g., in a signal handler).
-  // Thread 0 always exists, so if we are in vcore context, we return that.
-  //
-  // Otherwise, we know (since we are using pthreads) that the uthread struct
-  // current_uthread is pointing to is the first element of a
-  // struct pthread_tcb, so we extract and return the thread ID from that.
-  //
-  // TODO(dcross): Akaros anticipates moving the thread ID to the uthread
-  // structure at some point. We should modify this code to remove the cast
-  // when that happens.
-  if (in_vcore_context())
-    return 0;
-  return reinterpret_cast<struct pthread_tcb *>(current_uthread)->id;
-}
-
-#elif defined(__myriad2__)
-
-pid_t GetTID() {
-  uint32_t tid;
-  rtems_task_ident(RTEMS_SELF, 0, &tid);
-  return tid;
-}
-
-#else
-
-// Fallback implementation of GetTID using pthread_getspecific.
-ABSL_CONST_INIT static once_flag tid_once;
-ABSL_CONST_INIT static pthread_key_t tid_key;
-ABSL_CONST_INIT static absl::base_internal::SpinLock tid_lock(
-    absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
-
-// We set a bit per thread in this array to indicate that an ID is in
-// use. ID 0 is unused because it is the default value returned by
-// pthread_getspecific().
-ABSL_CONST_INIT static std::vector<uint32_t> *tid_array
-    ABSL_GUARDED_BY(tid_lock) = nullptr;
-static constexpr int kBitsPerWord = 32;  // tid_array is uint32_t.
-
-// Returns the TID to tid_array.
-static void FreeTID(void *v) {
-  intptr_t tid = reinterpret_cast<intptr_t>(v);
-  int word = tid / kBitsPerWord;
-  uint32_t mask = ~(1u << (tid % kBitsPerWord));
-  absl::base_internal::SpinLockHolder lock(&tid_lock);
-  assert(0 <= word && static_cast<size_t>(word) < tid_array->size());
-  (*tid_array)[word] &= mask;
-}
-
-static void InitGetTID() {
-  if (pthread_key_create(&tid_key, FreeTID) != 0) {
-    // The logging system calls GetTID() so it can't be used here.
-    perror("pthread_key_create failed");
-    abort();
-  }
-
-  // Initialize tid_array.
-  absl::base_internal::SpinLockHolder lock(&tid_lock);
-  tid_array = new std::vector<uint32_t>(1);
-  (*tid_array)[0] = 1;  // ID 0 is never-allocated.
-}
-
-// Return a per-thread small integer ID from pthread's thread-specific data.
-pid_t GetTID() {
-  absl::call_once(tid_once, InitGetTID);
-
-  intptr_t tid = reinterpret_cast<intptr_t>(pthread_getspecific(tid_key));
-  if (tid != 0) {
-    return tid;
-  }
-
-  int bit;  // tid_array[word] = 1u << bit;
-  size_t word;
-  {
-    // Search for the first unused ID.
-    absl::base_internal::SpinLockHolder lock(&tid_lock);
-    // First search for a word in the array that is not all ones.
-    word = 0;
-    while (word < tid_array->size() && ~(*tid_array)[word] == 0) {
-      ++word;
-    }
-    if (word == tid_array->size()) {
-      tid_array->push_back(0);  // No space left, add kBitsPerWord more IDs.
-    }
-    // Search for a zero bit in the word.
-    bit = 0;
-    while (bit < kBitsPerWord && (((*tid_array)[word] >> bit) & 1) != 0) {
-      ++bit;
-    }
-    tid = (word * kBitsPerWord) + bit;
-    (*tid_array)[word] |= 1u << bit;  // Mark the TID as allocated.
-  }
-
-  if (pthread_setspecific(tid_key, reinterpret_cast<void *>(tid)) != 0) {
-    perror("pthread_setspecific failed");
-    abort();
-  }
-
-  return static_cast<pid_t>(tid);
-}
-
-#endif
-
-// GetCachedTID() caches the thread ID in thread-local storage (which is a
-// userspace construct) to avoid unnecessary system calls. Without this caching,
-// it can take roughly 98ns, while it takes roughly 1ns with this caching.
-pid_t GetCachedTID() {
-#ifdef ABSL_HAVE_THREAD_LOCAL
-  static thread_local pid_t thread_id = GetTID();
-  return thread_id;
-#else
-  return GetTID();
-#endif  // ABSL_HAVE_THREAD_LOCAL
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/sysinfo.h b/third_party/abseil_cpp/absl/base/internal/sysinfo.h
deleted file mode 100644
index 119cf1f0e85b..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/sysinfo.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.
-//
-// This file includes routines to find out characteristics
-// of the machine a program is running on.  It is undoubtedly
-// system-dependent.
-
-// Functions listed here that accept a pid_t as an argument act on the
-// current process if the pid_t argument is 0
-// All functions here are thread-hostile due to file caching unless
-// commented otherwise.
-
-#ifndef ABSL_BASE_INTERNAL_SYSINFO_H_
-#define ABSL_BASE_INTERNAL_SYSINFO_H_
-
-#ifndef _WIN32
-#include <sys/types.h>
-#endif
-
-#include <cstdint>
-
-#include "absl/base/config.h"
-#include "absl/base/port.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// Nominal core processor cycles per second of each processor.   This is _not_
-// necessarily the frequency of the CycleClock counter (see cycleclock.h)
-// Thread-safe.
-double NominalCPUFrequency();
-
-// Number of logical processors (hyperthreads) in system. Thread-safe.
-int NumCPUs();
-
-// Return the thread id of the current thread, as told by the system.
-// No two currently-live threads implemented by the OS shall have the same ID.
-// Thread ids of exited threads may be reused.   Multiple user-level threads
-// may have the same thread ID if multiplexed on the same OS thread.
-//
-// On Linux, you may send a signal to the resulting ID with kill().  However,
-// it is recommended for portability that you use pthread_kill() instead.
-#ifdef _WIN32
-// On Windows, process id and thread id are of the same type according to the
-// return types of GetProcessId() and GetThreadId() are both DWORD, an unsigned
-// 32-bit type.
-using pid_t = uint32_t;
-#endif
-pid_t GetTID();
-
-// Like GetTID(), but caches the result in thread-local storage in order
-// to avoid unnecessary system calls. Note that there are some cases where
-// one must call through to GetTID directly, which is why this exists as a
-// separate function. For example, GetCachedTID() is not safe to call in
-// an asynchronous signal-handling context nor right after a call to fork().
-pid_t GetCachedTID();
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_SYSINFO_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/sysinfo_test.cc b/third_party/abseil_cpp/absl/base/internal/sysinfo_test.cc
deleted file mode 100644
index fa8b88b1dc07..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/sysinfo_test.cc
+++ /dev/null
@@ -1,100 +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/base/internal/sysinfo.h"
-
-#ifndef _WIN32
-#include <sys/types.h>
-#include <unistd.h>
-#endif
-
-#include <thread>  // NOLINT(build/c++11)
-#include <unordered_set>
-#include <vector>
-
-#include "gtest/gtest.h"
-#include "absl/synchronization/barrier.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-namespace {
-
-TEST(SysinfoTest, NumCPUs) {
-  EXPECT_NE(NumCPUs(), 0)
-      << "NumCPUs() should not have the default value of 0";
-}
-
-TEST(SysinfoTest, NominalCPUFrequency) {
-#if !(defined(__aarch64__) && defined(__linux__)) && !defined(__EMSCRIPTEN__)
-  EXPECT_GE(NominalCPUFrequency(), 1000.0)
-      << "NominalCPUFrequency() did not return a reasonable value";
-#else
-  // Aarch64 cannot read the CPU frequency from sysfs, so we get back 1.0.
-  // Emscripten does not have a sysfs to read from at all.
-  EXPECT_EQ(NominalCPUFrequency(), 1.0)
-      << "CPU frequency detection was fixed! Please update unittest.";
-#endif
-}
-
-TEST(SysinfoTest, GetTID) {
-  EXPECT_EQ(GetTID(), GetTID());  // Basic compile and equality test.
-#ifdef __native_client__
-  // Native Client has a race condition bug that leads to memory
-  // exaustion when repeatedly creating and joining threads.
-  // https://bugs.chromium.org/p/nativeclient/issues/detail?id=1027
-  return;
-#endif
-  // Test that TIDs are unique to each thread.
-  // Uses a few loops to exercise implementations that reallocate IDs.
-  for (int i = 0; i < 10; ++i) {
-    constexpr int kNumThreads = 10;
-    Barrier all_threads_done(kNumThreads);
-    std::vector<std::thread> threads;
-
-    Mutex mutex;
-    std::unordered_set<pid_t> tids;
-
-    for (int j = 0; j < kNumThreads; ++j) {
-      threads.push_back(std::thread([&]() {
-        pid_t id = GetTID();
-        {
-          MutexLock lock(&mutex);
-          ASSERT_TRUE(tids.find(id) == tids.end());
-          tids.insert(id);
-        }
-        // We can't simply join the threads here. The threads need to
-        // be alive otherwise the TID might have been reallocated to
-        // another live thread.
-        all_threads_done.Block();
-      }));
-    }
-    for (auto& thread : threads) {
-      thread.join();
-    }
-  }
-}
-
-#ifdef __linux__
-TEST(SysinfoTest, LinuxGetTID) {
-  // On Linux, for the main thread, GetTID()==getpid() is guaranteed by the API.
-  EXPECT_EQ(GetTID(), getpid());
-}
-#endif
-
-}  // namespace
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/thread_annotations.h b/third_party/abseil_cpp/absl/base/internal/thread_annotations.h
deleted file mode 100644
index 4dab6a9c150a..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/thread_annotations.h
+++ /dev/null
@@ -1,271 +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.
-//
-// -----------------------------------------------------------------------------
-// File: thread_annotations.h
-// -----------------------------------------------------------------------------
-//
-// WARNING: This is a backwards compatible header and it will be removed after
-// the migration to prefixed thread annotations is finished; please include
-// "absl/base/thread_annotations.h".
-//
-// This header file contains macro definitions for thread safety annotations
-// that allow developers to document the locking policies of multi-threaded
-// code. The annotations can also help program analysis tools to identify
-// potential thread safety issues.
-//
-// These annotations are implemented using compiler attributes. Using the macros
-// defined here instead of raw attributes allow for portability and future
-// compatibility.
-//
-// When referring to mutexes in the arguments of the attributes, you should
-// use variable names or more complex expressions (e.g. my_object->mutex_)
-// that evaluate to a concrete mutex object whenever possible. If the mutex
-// you want to refer to is not in scope, you may use a member pointer
-// (e.g. &MyClass::mutex_) to refer to a mutex in some (unknown) object.
-
-#ifndef ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
-#define ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
-
-#if defined(__clang__)
-#define THREAD_ANNOTATION_ATTRIBUTE__(x)   __attribute__((x))
-#else
-#define THREAD_ANNOTATION_ATTRIBUTE__(x)   // no-op
-#endif
-
-// GUARDED_BY()
-//
-// Documents if a shared field or global variable needs to be protected by a
-// mutex. GUARDED_BY() allows the user to specify a particular mutex that
-// should be held when accessing the annotated variable.
-//
-// Although this annotation (and PT_GUARDED_BY, below) cannot be applied to
-// local variables, a local variable and its associated mutex can often be
-// combined into a small class or struct, thereby allowing the annotation.
-//
-// Example:
-//
-//   class Foo {
-//     Mutex mu_;
-//     int p1_ GUARDED_BY(mu_);
-//     ...
-//   };
-#define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
-
-// PT_GUARDED_BY()
-//
-// Documents if the memory location pointed to by a pointer should be guarded
-// by a mutex when dereferencing the pointer.
-//
-// Example:
-//   class Foo {
-//     Mutex mu_;
-//     int *p1_ PT_GUARDED_BY(mu_);
-//     ...
-//   };
-//
-// Note that a pointer variable to a shared memory location could itself be a
-// shared variable.
-//
-// Example:
-//
-//   // `q_`, guarded by `mu1_`, points to a shared memory location that is
-//   // guarded by `mu2_`:
-//   int *q_ GUARDED_BY(mu1_) PT_GUARDED_BY(mu2_);
-#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
-
-// ACQUIRED_AFTER() / ACQUIRED_BEFORE()
-//
-// Documents the acquisition order between locks that can be held
-// simultaneously by a thread. For any two locks that need to be annotated
-// to establish an acquisition order, only one of them needs the annotation.
-// (i.e. You don't have to annotate both locks with both ACQUIRED_AFTER
-// and ACQUIRED_BEFORE.)
-//
-// As with GUARDED_BY, this is only applicable to mutexes that are shared
-// fields or global variables.
-//
-// Example:
-//
-//   Mutex m1_;
-//   Mutex m2_ ACQUIRED_AFTER(m1_);
-#define ACQUIRED_AFTER(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
-
-#define ACQUIRED_BEFORE(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
-
-// EXCLUSIVE_LOCKS_REQUIRED() / SHARED_LOCKS_REQUIRED()
-//
-// Documents a function that expects a mutex to be held prior to entry.
-// The mutex is expected to be held both on entry to, and exit from, the
-// function.
-//
-// An exclusive lock allows read-write access to the guarded data member(s), and
-// only one thread can acquire a lock exclusively at any one time. A shared lock
-// allows read-only access, and any number of threads can acquire a shared lock
-// concurrently.
-//
-// Generally, non-const methods should be annotated with
-// EXCLUSIVE_LOCKS_REQUIRED, while const methods should be annotated with
-// SHARED_LOCKS_REQUIRED.
-//
-// Example:
-//
-//   Mutex mu1, mu2;
-//   int a GUARDED_BY(mu1);
-//   int b GUARDED_BY(mu2);
-//
-//   void foo() EXCLUSIVE_LOCKS_REQUIRED(mu1, mu2) { ... }
-//   void bar() const SHARED_LOCKS_REQUIRED(mu1, mu2) { ... }
-#define EXCLUSIVE_LOCKS_REQUIRED(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
-
-#define SHARED_LOCKS_REQUIRED(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
-
-// LOCKS_EXCLUDED()
-//
-// Documents the locks acquired in the body of the function. These locks
-// cannot be held when calling this function (as Abseil's `Mutex` locks are
-// non-reentrant).
-#define LOCKS_EXCLUDED(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
-
-// LOCK_RETURNED()
-//
-// Documents a function that returns a mutex without acquiring it.  For example,
-// a public getter method that returns a pointer to a private mutex should
-// be annotated with LOCK_RETURNED.
-#define LOCK_RETURNED(x) \
-  THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
-
-// LOCKABLE
-//
-// Documents if a class/type is a lockable type (such as the `Mutex` class).
-#define LOCKABLE \
-  THREAD_ANNOTATION_ATTRIBUTE__(lockable)
-
-// SCOPED_LOCKABLE
-//
-// Documents if a class does RAII locking (such as the `MutexLock` class).
-// The constructor should use `LOCK_FUNCTION()` to specify the mutex that is
-// acquired, and the destructor should use `UNLOCK_FUNCTION()` with no
-// arguments; the analysis will assume that the destructor unlocks whatever the
-// constructor locked.
-#define SCOPED_LOCKABLE \
-  THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
-
-// EXCLUSIVE_LOCK_FUNCTION()
-//
-// Documents functions that acquire a lock in the body of a function, and do
-// not release it.
-#define EXCLUSIVE_LOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
-
-// SHARED_LOCK_FUNCTION()
-//
-// Documents functions that acquire a shared (reader) lock in the body of a
-// function, and do not release it.
-#define SHARED_LOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
-
-// UNLOCK_FUNCTION()
-//
-// Documents functions that expect a lock to be held on entry to the function,
-// and release it in the body of the function.
-#define UNLOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
-
-// EXCLUSIVE_TRYLOCK_FUNCTION() / SHARED_TRYLOCK_FUNCTION()
-//
-// Documents functions that try to acquire a lock, and return success or failure
-// (or a non-boolean value that can be interpreted as a boolean).
-// The first argument should be `true` for functions that return `true` on
-// success, or `false` for functions that return `false` on success. The second
-// argument specifies the mutex that is locked on success. If unspecified, this
-// mutex is assumed to be `this`.
-#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
-
-#define SHARED_TRYLOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
-
-// ASSERT_EXCLUSIVE_LOCK() / ASSERT_SHARED_LOCK()
-//
-// Documents functions that dynamically check to see if a lock is held, and fail
-// if it is not held.
-#define ASSERT_EXCLUSIVE_LOCK(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(assert_exclusive_lock(__VA_ARGS__))
-
-#define ASSERT_SHARED_LOCK(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_lock(__VA_ARGS__))
-
-// NO_THREAD_SAFETY_ANALYSIS
-//
-// Turns off thread safety checking within the body of a particular function.
-// This annotation is used to mark functions that are known to be correct, but
-// the locking behavior is more complicated than the analyzer can handle.
-#define NO_THREAD_SAFETY_ANALYSIS \
-  THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
-
-//------------------------------------------------------------------------------
-// Tool-Supplied Annotations
-//------------------------------------------------------------------------------
-
-// TS_UNCHECKED should be placed around lock expressions that are not valid
-// C++ syntax, but which are present for documentation purposes.  These
-// annotations will be ignored by the analysis.
-#define TS_UNCHECKED(x) ""
-
-// TS_FIXME is used to mark lock expressions that are not valid C++ syntax.
-// It is used by automated tools to mark and disable invalid expressions.
-// The annotation should either be fixed, or changed to TS_UNCHECKED.
-#define TS_FIXME(x) ""
-
-// Like NO_THREAD_SAFETY_ANALYSIS, this turns off checking within the body of
-// a particular function.  However, this attribute is used to mark functions
-// that are incorrect and need to be fixed.  It is used by automated tools to
-// avoid breaking the build when the analysis is updated.
-// Code owners are expected to eventually fix the routine.
-#define NO_THREAD_SAFETY_ANALYSIS_FIXME  NO_THREAD_SAFETY_ANALYSIS
-
-// Similar to NO_THREAD_SAFETY_ANALYSIS_FIXME, this macro marks a GUARDED_BY
-// annotation that needs to be fixed, because it is producing thread safety
-// warning.  It disables the GUARDED_BY.
-#define GUARDED_BY_FIXME(x)
-
-// Disables warnings for a single read operation.  This can be used to avoid
-// warnings when it is known that the read is not actually involved in a race,
-// but the compiler cannot confirm that.
-#define TS_UNCHECKED_READ(x) thread_safety_analysis::ts_unchecked_read(x)
-
-
-namespace thread_safety_analysis {
-
-// Takes a reference to a guarded data member, and returns an unguarded
-// reference.
-template <typename T>
-inline const T& ts_unchecked_read(const T& v) NO_THREAD_SAFETY_ANALYSIS {
-  return v;
-}
-
-template <typename T>
-inline T& ts_unchecked_read(T& v) NO_THREAD_SAFETY_ANALYSIS {
-  return v;
-}
-
-}  // namespace thread_safety_analysis
-
-#endif  // ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/thread_identity.cc b/third_party/abseil_cpp/absl/base/internal/thread_identity.cc
deleted file mode 100644
index 6ea010ed0d31..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/thread_identity.cc
+++ /dev/null
@@ -1,155 +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/base/internal/thread_identity.h"
-
-#ifndef _WIN32
-#include <pthread.h>
-#include <signal.h>
-#endif
-
-#include <atomic>
-#include <cassert>
-#include <memory>
-
-#include "absl/base/attributes.h"
-#include "absl/base/call_once.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/spinlock.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-#if ABSL_THREAD_IDENTITY_MODE != ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-namespace {
-// Used to co-ordinate one-time creation of our pthread_key
-absl::once_flag init_thread_identity_key_once;
-pthread_key_t thread_identity_pthread_key;
-std::atomic<bool> pthread_key_initialized(false);
-
-void AllocateThreadIdentityKey(ThreadIdentityReclaimerFunction reclaimer) {
-  pthread_key_create(&thread_identity_pthread_key, reclaimer);
-  pthread_key_initialized.store(true, std::memory_order_release);
-}
-}  // namespace
-#endif
-
-#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
-    ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-// The actual TLS storage for a thread's currently associated ThreadIdentity.
-// This is referenced by inline accessors in the header.
-// "protected" visibility ensures that if multiple instances of Abseil code
-// exist within a process (via dlopen() or similar), references to
-// thread_identity_ptr from each instance of the code will refer to
-// *different* instances of this ptr.
-// Apple platforms have the visibility attribute, but issue a compile warning
-// that protected visibility is unsupported.
-#if ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)
-__attribute__((visibility("protected")))
-#endif  // ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)
-#if ABSL_PER_THREAD_TLS
-// Prefer __thread to thread_local as benchmarks indicate it is a bit faster.
-ABSL_PER_THREAD_TLS_KEYWORD ThreadIdentity* thread_identity_ptr = nullptr;
-#elif defined(ABSL_HAVE_THREAD_LOCAL)
-thread_local ThreadIdentity* thread_identity_ptr = nullptr;
-#endif  // ABSL_PER_THREAD_TLS
-#endif  // TLS or CPP11
-
-void SetCurrentThreadIdentity(
-    ThreadIdentity* identity, ThreadIdentityReclaimerFunction reclaimer) {
-  assert(CurrentThreadIdentityIfPresent() == nullptr);
-  // Associate our destructor.
-  // NOTE: This call to pthread_setspecific is currently the only immovable
-  // barrier to CurrentThreadIdentity() always being async signal safe.
-#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
-  // NOTE: Not async-safe.  But can be open-coded.
-  absl::call_once(init_thread_identity_key_once, AllocateThreadIdentityKey,
-                  reclaimer);
-
-#if defined(__EMSCRIPTEN__) || defined(__MINGW32__)
-  // Emscripten and MinGW pthread implementations does not support signals.
-  // See https://kripken.github.io/emscripten-site/docs/porting/pthreads.html
-  // for more information.
-  pthread_setspecific(thread_identity_pthread_key,
-                      reinterpret_cast<void*>(identity));
-#else
-  // We must mask signals around the call to setspecific as with current glibc,
-  // a concurrent getspecific (needed for GetCurrentThreadIdentityIfPresent())
-  // may zero our value.
-  //
-  // While not officially async-signal safe, getspecific within a signal handler
-  // is otherwise OK.
-  sigset_t all_signals;
-  sigset_t curr_signals;
-  sigfillset(&all_signals);
-  pthread_sigmask(SIG_SETMASK, &all_signals, &curr_signals);
-  pthread_setspecific(thread_identity_pthread_key,
-                      reinterpret_cast<void*>(identity));
-  pthread_sigmask(SIG_SETMASK, &curr_signals, nullptr);
-#endif  // !__EMSCRIPTEN__ && !__MINGW32__
-
-#elif ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS
-  // NOTE: Not async-safe.  But can be open-coded.
-  absl::call_once(init_thread_identity_key_once, AllocateThreadIdentityKey,
-                  reclaimer);
-  pthread_setspecific(thread_identity_pthread_key,
-                      reinterpret_cast<void*>(identity));
-  thread_identity_ptr = identity;
-#elif ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-  thread_local std::unique_ptr<ThreadIdentity, ThreadIdentityReclaimerFunction>
-      holder(identity, reclaimer);
-  thread_identity_ptr = identity;
-#else
-#error Unimplemented ABSL_THREAD_IDENTITY_MODE
-#endif
-}
-
-#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
-    ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-
-// Please see the comment on `CurrentThreadIdentityIfPresent` in
-// thread_identity.h. Because DLLs cannot expose thread_local variables in
-// headers, we opt for the correct-but-slower option of placing the definition
-// of this function only in a translation unit inside DLL.
-#if defined(ABSL_BUILD_DLL) || defined(ABSL_CONSUME_DLL)
-ThreadIdentity* CurrentThreadIdentityIfPresent() { return thread_identity_ptr; }
-#endif
-#endif
-
-void ClearCurrentThreadIdentity() {
-#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
-    ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-  thread_identity_ptr = nullptr;
-#elif ABSL_THREAD_IDENTITY_MODE == \
-      ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
-  // pthread_setspecific expected to clear value on destruction
-  assert(CurrentThreadIdentityIfPresent() == nullptr);
-#endif
-}
-
-#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
-ThreadIdentity* CurrentThreadIdentityIfPresent() {
-  bool initialized = pthread_key_initialized.load(std::memory_order_acquire);
-  if (!initialized) {
-    return nullptr;
-  }
-  return reinterpret_cast<ThreadIdentity*>(
-      pthread_getspecific(thread_identity_pthread_key));
-}
-#endif
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/thread_identity.h b/third_party/abseil_cpp/absl/base/internal/thread_identity.h
deleted file mode 100644
index d2a65fd81126..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/thread_identity.h
+++ /dev/null
@@ -1,260 +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.
-//
-// Each active thread has an ThreadIdentity that may represent the thread in
-// various level interfaces.  ThreadIdentity objects are never deallocated.
-// When a thread terminates, its ThreadIdentity object may be reused for a
-// thread created later.
-
-#ifndef ABSL_BASE_INTERNAL_THREAD_IDENTITY_H_
-#define ABSL_BASE_INTERNAL_THREAD_IDENTITY_H_
-
-#ifndef _WIN32
-#include <pthread.h>
-// Defines __GOOGLE_GRTE_VERSION__ (via glibc-specific features.h) when
-// supported.
-#include <unistd.h>
-#endif
-
-#include <atomic>
-#include <cstdint>
-
-#include "absl/base/config.h"
-#include "absl/base/internal/per_thread_tls.h"
-#include "absl/base/optimization.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-struct SynchLocksHeld;
-struct SynchWaitParams;
-
-namespace base_internal {
-
-class SpinLock;
-struct ThreadIdentity;
-
-// Used by the implementation of absl::Mutex and absl::CondVar.
-struct PerThreadSynch {
-  // The internal representation of absl::Mutex and absl::CondVar rely
-  // on the alignment of PerThreadSynch. Both store the address of the
-  // PerThreadSynch in the high-order bits of their internal state,
-  // which means the low kLowZeroBits of the address of PerThreadSynch
-  // must be zero.
-  static constexpr int kLowZeroBits = 8;
-  static constexpr int kAlignment = 1 << kLowZeroBits;
-
-  // Returns the associated ThreadIdentity.
-  // This can be implemented as a cast because we guarantee
-  // PerThreadSynch is the first element of ThreadIdentity.
-  ThreadIdentity* thread_identity() {
-    return reinterpret_cast<ThreadIdentity*>(this);
-  }
-
-  PerThreadSynch *next;  // Circular waiter queue; initialized to 0.
-  PerThreadSynch *skip;  // If non-zero, all entries in Mutex queue
-                         // up to and including "skip" have same
-                         // condition as this, and will be woken later
-  bool may_skip;         // if false while on mutex queue, a mutex unlocker
-                         // is using this PerThreadSynch as a terminator.  Its
-                         // skip field must not be filled in because the loop
-                         // might then skip over the terminator.
-  bool wake;             // This thread is to be woken from a Mutex.
-  // If "x" is on a waiter list for a mutex, "x->cond_waiter" is true iff the
-  // waiter is waiting on the mutex as part of a CV Wait or Mutex Await.
-  //
-  // The value of "x->cond_waiter" is meaningless if "x" is not on a
-  // Mutex waiter list.
-  bool cond_waiter;
-  bool maybe_unlocking;  // Valid at head of Mutex waiter queue;
-                         // true if UnlockSlow could be searching
-                         // for a waiter to wake.  Used for an optimization
-                         // in Enqueue().  true is always a valid value.
-                         // Can be reset to false when the unlocker or any
-                         // writer releases the lock, or a reader fully
-                         // releases the lock.  It may not be set to false
-                         // by a reader that decrements the count to
-                         // non-zero. protected by mutex spinlock
-  bool suppress_fatal_errors;  // If true, try to proceed even in the face
-                               // of broken invariants.  This is used within
-                               // fatal signal handlers to improve the
-                               // chances of debug logging information being
-                               // output successfully.
-  int priority;                // Priority of thread (updated every so often).
-
-  // State values:
-  //   kAvailable: This PerThreadSynch is available.
-  //   kQueued: This PerThreadSynch is unavailable, it's currently queued on a
-  //            Mutex or CondVar waistlist.
-  //
-  // Transitions from kQueued to kAvailable require a release
-  // barrier. This is needed as a waiter may use "state" to
-  // independently observe that it's no longer queued.
-  //
-  // Transitions from kAvailable to kQueued require no barrier, they
-  // are externally ordered by the Mutex.
-  enum State {
-    kAvailable,
-    kQueued
-  };
-  std::atomic<State> state;
-
-  // The wait parameters of the current wait.  waitp is null if the
-  // thread is not waiting. Transitions from null to non-null must
-  // occur before the enqueue commit point (state = kQueued in
-  // Enqueue() and CondVarEnqueue()). Transitions from non-null to
-  // null must occur after the wait is finished (state = kAvailable in
-  // Mutex::Block() and CondVar::WaitCommon()). This field may be
-  // changed only by the thread that describes this PerThreadSynch.  A
-  // special case is Fer(), which calls Enqueue() on another thread,
-  // but with an identical SynchWaitParams pointer, thus leaving the
-  // pointer unchanged.
-  SynchWaitParams* waitp;
-
-  intptr_t readers;     // Number of readers in mutex.
-
-  // When priority will next be read (cycles).
-  int64_t next_priority_read_cycles;
-
-  // Locks held; used during deadlock detection.
-  // Allocated in Synch_GetAllLocks() and freed in ReclaimThreadIdentity().
-  SynchLocksHeld *all_locks;
-};
-
-// The instances of this class are allocated in NewThreadIdentity() with an
-// alignment of PerThreadSynch::kAlignment.
-struct ThreadIdentity {
-  // Must be the first member.  The Mutex implementation requires that
-  // the PerThreadSynch object associated with each thread is
-  // PerThreadSynch::kAlignment aligned.  We provide this alignment on
-  // ThreadIdentity itself.
-  PerThreadSynch per_thread_synch;
-
-  // Private: Reserved for absl::synchronization_internal::Waiter.
-  struct WaiterState {
-    char data[128];
-  } waiter_state;
-
-  // Used by PerThreadSem::{Get,Set}ThreadBlockedCounter().
-  std::atomic<int>* blocked_count_ptr;
-
-  // The following variables are mostly read/written just by the
-  // thread itself.  The only exception is that these are read by
-  // a ticker thread as a hint.
-  std::atomic<int> ticker;      // Tick counter, incremented once per second.
-  std::atomic<int> wait_start;  // Ticker value when thread started waiting.
-  std::atomic<bool> is_idle;    // Has thread become idle yet?
-
-  ThreadIdentity* next;
-};
-
-// Returns the ThreadIdentity object representing the calling thread; guaranteed
-// to be unique for its lifetime.  The returned object will remain valid for the
-// program's lifetime; although it may be re-assigned to a subsequent thread.
-// If one does not exist, return nullptr instead.
-//
-// Does not malloc(*), and is async-signal safe.
-// [*] Technically pthread_setspecific() does malloc on first use; however this
-// is handled internally within tcmalloc's initialization already.
-//
-// New ThreadIdentity objects can be constructed and associated with a thread
-// by calling GetOrCreateCurrentThreadIdentity() in per-thread-sem.h.
-ThreadIdentity* CurrentThreadIdentityIfPresent();
-
-using ThreadIdentityReclaimerFunction = void (*)(void*);
-
-// Sets the current thread identity to the given value.  'reclaimer' is a
-// pointer to the global function for cleaning up instances on thread
-// destruction.
-void SetCurrentThreadIdentity(ThreadIdentity* identity,
-                              ThreadIdentityReclaimerFunction reclaimer);
-
-// Removes the currently associated ThreadIdentity from the running thread.
-// This must be called from inside the ThreadIdentityReclaimerFunction, and only
-// from that function.
-void ClearCurrentThreadIdentity();
-
-// May be chosen at compile time via: -DABSL_FORCE_THREAD_IDENTITY_MODE=<mode
-// index>
-#ifdef ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
-#error ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC cannot be direcly set
-#else
-#define ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC 0
-#endif
-
-#ifdef ABSL_THREAD_IDENTITY_MODE_USE_TLS
-#error ABSL_THREAD_IDENTITY_MODE_USE_TLS cannot be direcly set
-#else
-#define ABSL_THREAD_IDENTITY_MODE_USE_TLS 1
-#endif
-
-#ifdef ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-#error ABSL_THREAD_IDENTITY_MODE_USE_CPP11 cannot be direcly set
-#else
-#define ABSL_THREAD_IDENTITY_MODE_USE_CPP11 2
-#endif
-
-#ifdef ABSL_THREAD_IDENTITY_MODE
-#error ABSL_THREAD_IDENTITY_MODE cannot be direcly set
-#elif defined(ABSL_FORCE_THREAD_IDENTITY_MODE)
-#define ABSL_THREAD_IDENTITY_MODE ABSL_FORCE_THREAD_IDENTITY_MODE
-#elif defined(_WIN32) && !defined(__MINGW32__)
-#define ABSL_THREAD_IDENTITY_MODE ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-#elif defined(__APPLE__) && defined(ABSL_HAVE_THREAD_LOCAL)
-#define ABSL_THREAD_IDENTITY_MODE ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-#elif ABSL_PER_THREAD_TLS && defined(__GOOGLE_GRTE_VERSION__) &&        \
-    (__GOOGLE_GRTE_VERSION__ >= 20140228L)
-// Support for async-safe TLS was specifically added in GRTEv4.  It's not
-// present in the upstream eglibc.
-// Note:  Current default for production systems.
-#define ABSL_THREAD_IDENTITY_MODE ABSL_THREAD_IDENTITY_MODE_USE_TLS
-#else
-#define ABSL_THREAD_IDENTITY_MODE \
-  ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
-#endif
-
-#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
-    ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
-
-#if ABSL_PER_THREAD_TLS
-ABSL_CONST_INIT extern ABSL_PER_THREAD_TLS_KEYWORD ThreadIdentity*
-    thread_identity_ptr;
-#elif defined(ABSL_HAVE_THREAD_LOCAL)
-ABSL_CONST_INIT extern thread_local ThreadIdentity* thread_identity_ptr;
-#else
-#error Thread-local storage not detected on this platform
-#endif
-
-// thread_local variables cannot be in headers exposed by DLLs. However, it is
-// important for performance reasons in general that
-// `CurrentThreadIdentityIfPresent` be inlined. This is not possible across a
-// DLL boundary so, with DLLs, we opt to have the function not be inlined. Note
-// that `CurrentThreadIdentityIfPresent` is declared above so we can exclude
-// this entire inline definition when compiling as a DLL.
-#if !defined(ABSL_BUILD_DLL) && !defined(ABSL_CONSUME_DLL)
-inline ThreadIdentity* CurrentThreadIdentityIfPresent() {
-  return thread_identity_ptr;
-}
-#endif
-
-#elif ABSL_THREAD_IDENTITY_MODE != \
-    ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
-#error Unknown ABSL_THREAD_IDENTITY_MODE
-#endif
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_THREAD_IDENTITY_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/thread_identity_benchmark.cc b/third_party/abseil_cpp/absl/base/internal/thread_identity_benchmark.cc
deleted file mode 100644
index 0ae10f2b1e8a..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/thread_identity_benchmark.cc
+++ /dev/null
@@ -1,38 +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 "benchmark/benchmark.h"
-#include "absl/base/internal/thread_identity.h"
-#include "absl/synchronization/internal/create_thread_identity.h"
-#include "absl/synchronization/internal/per_thread_sem.h"
-
-namespace {
-
-void BM_SafeCurrentThreadIdentity(benchmark::State& state) {
-  for (auto _ : state) {
-    benchmark::DoNotOptimize(
-        absl::synchronization_internal::GetOrCreateCurrentThreadIdentity());
-  }
-}
-BENCHMARK(BM_SafeCurrentThreadIdentity);
-
-void BM_UnsafeCurrentThreadIdentity(benchmark::State& state) {
-  for (auto _ : state) {
-    benchmark::DoNotOptimize(
-        absl::base_internal::CurrentThreadIdentityIfPresent());
-  }
-}
-BENCHMARK(BM_UnsafeCurrentThreadIdentity);
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/thread_identity_test.cc b/third_party/abseil_cpp/absl/base/internal/thread_identity_test.cc
deleted file mode 100644
index 46a6f7434629..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/thread_identity_test.cc
+++ /dev/null
@@ -1,129 +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/base/internal/thread_identity.h"
-
-#include <thread>  // NOLINT(build/c++11)
-#include <vector>
-
-#include "gtest/gtest.h"
-#include "absl/base/attributes.h"
-#include "absl/base/internal/spinlock.h"
-#include "absl/base/macros.h"
-#include "absl/base/thread_annotations.h"
-#include "absl/synchronization/internal/per_thread_sem.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-namespace {
-
-ABSL_CONST_INIT static absl::base_internal::SpinLock map_lock(
-    absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
-ABSL_CONST_INIT static int num_identities_reused ABSL_GUARDED_BY(map_lock);
-
-static const void* const kCheckNoIdentity = reinterpret_cast<void*>(1);
-
-static void TestThreadIdentityCurrent(const void* assert_no_identity) {
-  ThreadIdentity* identity;
-
-  // We have to test this conditionally, because if the test framework relies
-  // on Abseil, then some previous action may have already allocated an
-  // identity.
-  if (assert_no_identity == kCheckNoIdentity) {
-    identity = CurrentThreadIdentityIfPresent();
-    EXPECT_TRUE(identity == nullptr);
-  }
-
-  identity = synchronization_internal::GetOrCreateCurrentThreadIdentity();
-  EXPECT_TRUE(identity != nullptr);
-  ThreadIdentity* identity_no_init;
-  identity_no_init = CurrentThreadIdentityIfPresent();
-  EXPECT_TRUE(identity == identity_no_init);
-
-  // Check that per_thread_synch is correctly aligned.
-  EXPECT_EQ(0, reinterpret_cast<intptr_t>(&identity->per_thread_synch) %
-                   PerThreadSynch::kAlignment);
-  EXPECT_EQ(identity, identity->per_thread_synch.thread_identity());
-
-  absl::base_internal::SpinLockHolder l(&map_lock);
-  num_identities_reused++;
-}
-
-TEST(ThreadIdentityTest, BasicIdentityWorks) {
-  // This tests for the main() thread.
-  TestThreadIdentityCurrent(nullptr);
-}
-
-TEST(ThreadIdentityTest, BasicIdentityWorksThreaded) {
-  // Now try the same basic test with multiple threads being created and
-  // destroyed.  This makes sure that:
-  // - New threads are created without a ThreadIdentity.
-  // - We re-allocate ThreadIdentity objects from the free-list.
-  // - If a thread implementation chooses to recycle threads, that
-  //   correct re-initialization occurs.
-  static const int kNumLoops = 3;
-  static const int kNumThreads = 32;
-  for (int iter = 0; iter < kNumLoops; iter++) {
-    std::vector<std::thread> threads;
-    for (int i = 0; i < kNumThreads; ++i) {
-      threads.push_back(
-          std::thread(TestThreadIdentityCurrent, kCheckNoIdentity));
-    }
-    for (auto& thread : threads) {
-      thread.join();
-    }
-  }
-
-  // We should have recycled ThreadIdentity objects above; while (external)
-  // library threads allocating their own identities may preclude some
-  // reuse, we should have sufficient repetitions to exclude this.
-  absl::base_internal::SpinLockHolder l(&map_lock);
-  EXPECT_LT(kNumThreads, num_identities_reused);
-}
-
-TEST(ThreadIdentityTest, ReusedThreadIdentityMutexTest) {
-  // This test repeatly creates and joins a series of threads, each of
-  // which acquires and releases shared Mutex locks. This verifies
-  // Mutex operations work correctly under a reused
-  // ThreadIdentity. Note that the most likely failure mode of this
-  // test is a crash or deadlock.
-  static const int kNumLoops = 10;
-  static const int kNumThreads = 12;
-  static const int kNumMutexes = 3;
-  static const int kNumLockLoops = 5;
-
-  Mutex mutexes[kNumMutexes];
-  for (int iter = 0; iter < kNumLoops; ++iter) {
-    std::vector<std::thread> threads;
-    for (int thread = 0; thread < kNumThreads; ++thread) {
-      threads.push_back(std::thread([&]() {
-        for (int l = 0; l < kNumLockLoops; ++l) {
-          for (int m = 0; m < kNumMutexes; ++m) {
-            MutexLock lock(&mutexes[m]);
-          }
-        }
-      }));
-    }
-    for (auto& thread : threads) {
-      thread.join();
-    }
-  }
-}
-
-}  // namespace
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/throw_delegate.cc b/third_party/abseil_cpp/absl/base/internal/throw_delegate.cc
deleted file mode 100644
index c260ff1eed63..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/throw_delegate.cc
+++ /dev/null
@@ -1,212 +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/base/internal/throw_delegate.h"
-
-#include <cstdlib>
-#include <functional>
-#include <new>
-#include <stdexcept>
-
-#include "absl/base/config.h"
-#include "absl/base/internal/raw_logging.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// NOTE: The various STL exception throwing functions are placed within the
-// #ifdef blocks so the symbols aren't exposed on platforms that don't support
-// them, such as the Android NDK. For example, ANGLE fails to link when building
-// within AOSP without them, since the STL functions don't exist.
-namespace {
-#ifdef ABSL_HAVE_EXCEPTIONS
-template <typename T>
-[[noreturn]] void Throw(const T& error) {
-  throw error;
-}
-#endif
-}  // namespace
-
-void ThrowStdLogicError(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::logic_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdLogicError(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::logic_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-void ThrowStdInvalidArgument(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::invalid_argument(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdInvalidArgument(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::invalid_argument(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdDomainError(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::domain_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdDomainError(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::domain_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdLengthError(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::length_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdLengthError(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::length_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdOutOfRange(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::out_of_range(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdOutOfRange(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::out_of_range(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdRuntimeError(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::runtime_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdRuntimeError(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::runtime_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdRangeError(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::range_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdRangeError(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::range_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdOverflowError(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::overflow_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdOverflowError(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::overflow_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdUnderflowError(const std::string& what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::underflow_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
-  std::abort();
-#endif
-}
-void ThrowStdUnderflowError(const char* what_arg) {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::underflow_error(what_arg));
-#else
-  ABSL_RAW_LOG(FATAL, "%s", what_arg);
-  std::abort();
-#endif
-}
-
-void ThrowStdBadFunctionCall() {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::bad_function_call());
-#else
-  std::abort();
-#endif
-}
-
-void ThrowStdBadAlloc() {
-#ifdef ABSL_HAVE_EXCEPTIONS
-  Throw(std::bad_alloc());
-#else
-  std::abort();
-#endif
-}
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/base/internal/throw_delegate.h b/third_party/abseil_cpp/absl/base/internal/throw_delegate.h
deleted file mode 100644
index 075f5272543a..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/throw_delegate.h
+++ /dev/null
@@ -1,75 +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_BASE_INTERNAL_THROW_DELEGATE_H_
-#define ABSL_BASE_INTERNAL_THROW_DELEGATE_H_
-
-#include <string>
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-// Helper functions that allow throwing exceptions consistently from anywhere.
-// The main use case is for header-based libraries (eg templates), as they will
-// be built by many different targets with their own compiler options.
-// In particular, this will allow a safe way to throw exceptions even if the
-// caller is compiled with -fno-exceptions.  This is intended for implementing
-// things like map<>::at(), which the standard documents as throwing an
-// exception on error.
-//
-// Using other techniques like #if tricks could lead to ODR violations.
-//
-// You shouldn't use it unless you're writing code that you know will be built
-// both with and without exceptions and you need to conform to an interface
-// that uses exceptions.
-
-[[noreturn]] void ThrowStdLogicError(const std::string& what_arg);
-[[noreturn]] void ThrowStdLogicError(const char* what_arg);
-[[noreturn]] void ThrowStdInvalidArgument(const std::string& what_arg);
-[[noreturn]] void ThrowStdInvalidArgument(const char* what_arg);
-[[noreturn]] void ThrowStdDomainError(const std::string& what_arg);
-[[noreturn]] void ThrowStdDomainError(const char* what_arg);
-[[noreturn]] void ThrowStdLengthError(const std::string& what_arg);
-[[noreturn]] void ThrowStdLengthError(const char* what_arg);
-[[noreturn]] void ThrowStdOutOfRange(const std::string& what_arg);
-[[noreturn]] void ThrowStdOutOfRange(const char* what_arg);
-[[noreturn]] void ThrowStdRuntimeError(const std::string& what_arg);
-[[noreturn]] void ThrowStdRuntimeError(const char* what_arg);
-[[noreturn]] void ThrowStdRangeError(const std::string& what_arg);
-[[noreturn]] void ThrowStdRangeError(const char* what_arg);
-[[noreturn]] void ThrowStdOverflowError(const std::string& what_arg);
-[[noreturn]] void ThrowStdOverflowError(const char* what_arg);
-[[noreturn]] void ThrowStdUnderflowError(const std::string& what_arg);
-[[noreturn]] void ThrowStdUnderflowError(const char* what_arg);
-
-[[noreturn]] void ThrowStdBadFunctionCall();
-[[noreturn]] void ThrowStdBadAlloc();
-
-// ThrowStdBadArrayNewLength() cannot be consistently supported because
-// std::bad_array_new_length is missing in libstdc++ until 4.9.0.
-// https://gcc.gnu.org/onlinedocs/gcc-4.8.3/libstdc++/api/a01379_source.html
-// https://gcc.gnu.org/onlinedocs/gcc-4.9.0/libstdc++/api/a01327_source.html
-// libcxx (as of 3.2) and msvc (as of 2015) both have it.
-// [[noreturn]] void ThrowStdBadArrayNewLength();
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_INTERNAL_THROW_DELEGATE_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/tsan_mutex_interface.h b/third_party/abseil_cpp/absl/base/internal/tsan_mutex_interface.h
deleted file mode 100644
index 39207d8a5c42..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/tsan_mutex_interface.h
+++ /dev/null
@@ -1,68 +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.
-//
-// This file is intended solely for spinlock.h.
-// It provides ThreadSanitizer annotations for custom mutexes.
-// See <sanitizer/tsan_interface.h> for meaning of these annotations.
-
-#ifndef ABSL_BASE_INTERNAL_TSAN_MUTEX_INTERFACE_H_
-#define ABSL_BASE_INTERNAL_TSAN_MUTEX_INTERFACE_H_
-
-#include "absl/base/config.h"
-
-// ABSL_INTERNAL_HAVE_TSAN_INTERFACE
-// Macro intended only for internal use.
-//
-// Checks whether LLVM Thread Sanitizer interfaces are available.
-// First made available in LLVM 5.0 (Sep 2017).
-#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
-#error "ABSL_INTERNAL_HAVE_TSAN_INTERFACE cannot be directly set."
-#endif
-
-#if defined(ABSL_HAVE_THREAD_SANITIZER) && defined(__has_include)
-#if __has_include(<sanitizer/tsan_interface.h>)
-#define ABSL_INTERNAL_HAVE_TSAN_INTERFACE 1
-#endif
-#endif
-
-#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
-#include <sanitizer/tsan_interface.h>
-
-#define ABSL_TSAN_MUTEX_CREATE __tsan_mutex_create
-#define ABSL_TSAN_MUTEX_DESTROY __tsan_mutex_destroy
-#define ABSL_TSAN_MUTEX_PRE_LOCK __tsan_mutex_pre_lock
-#define ABSL_TSAN_MUTEX_POST_LOCK __tsan_mutex_post_lock
-#define ABSL_TSAN_MUTEX_PRE_UNLOCK __tsan_mutex_pre_unlock
-#define ABSL_TSAN_MUTEX_POST_UNLOCK __tsan_mutex_post_unlock
-#define ABSL_TSAN_MUTEX_PRE_SIGNAL __tsan_mutex_pre_signal
-#define ABSL_TSAN_MUTEX_POST_SIGNAL __tsan_mutex_post_signal
-#define ABSL_TSAN_MUTEX_PRE_DIVERT __tsan_mutex_pre_divert
-#define ABSL_TSAN_MUTEX_POST_DIVERT __tsan_mutex_post_divert
-
-#else
-
-#define ABSL_TSAN_MUTEX_CREATE(...)
-#define ABSL_TSAN_MUTEX_DESTROY(...)
-#define ABSL_TSAN_MUTEX_PRE_LOCK(...)
-#define ABSL_TSAN_MUTEX_POST_LOCK(...)
-#define ABSL_TSAN_MUTEX_PRE_UNLOCK(...)
-#define ABSL_TSAN_MUTEX_POST_UNLOCK(...)
-#define ABSL_TSAN_MUTEX_PRE_SIGNAL(...)
-#define ABSL_TSAN_MUTEX_POST_SIGNAL(...)
-#define ABSL_TSAN_MUTEX_PRE_DIVERT(...)
-#define ABSL_TSAN_MUTEX_POST_DIVERT(...)
-
-#endif
-
-#endif  // ABSL_BASE_INTERNAL_TSAN_MUTEX_INTERFACE_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/unaligned_access.h b/third_party/abseil_cpp/absl/base/internal/unaligned_access.h
deleted file mode 100644
index 093dd9b499f0..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/unaligned_access.h
+++ /dev/null
@@ -1,82 +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_BASE_INTERNAL_UNALIGNED_ACCESS_H_
-#define ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
-
-#include <string.h>
-
-#include <cstdint>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-
-// unaligned APIs
-
-// Portable handling of unaligned loads, stores, and copies.
-
-// The unaligned API is C++ only.  The declarations use C++ features
-// (namespaces, inline) which are absent or incompatible in C.
-#if defined(__cplusplus)
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-inline uint16_t UnalignedLoad16(const void *p) {
-  uint16_t t;
-  memcpy(&t, p, sizeof t);
-  return t;
-}
-
-inline uint32_t UnalignedLoad32(const void *p) {
-  uint32_t t;
-  memcpy(&t, p, sizeof t);
-  return t;
-}
-
-inline uint64_t UnalignedLoad64(const void *p) {
-  uint64_t t;
-  memcpy(&t, p, sizeof t);
-  return t;
-}
-
-inline void UnalignedStore16(void *p, uint16_t v) { memcpy(p, &v, sizeof v); }
-
-inline void UnalignedStore32(void *p, uint32_t v) { memcpy(p, &v, sizeof v); }
-
-inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#define ABSL_INTERNAL_UNALIGNED_LOAD16(_p) \
-  (absl::base_internal::UnalignedLoad16(_p))
-#define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) \
-  (absl::base_internal::UnalignedLoad32(_p))
-#define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) \
-  (absl::base_internal::UnalignedLoad64(_p))
-
-#define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
-  (absl::base_internal::UnalignedStore16(_p, _val))
-#define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \
-  (absl::base_internal::UnalignedStore32(_p, _val))
-#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
-  (absl::base_internal::UnalignedStore64(_p, _val))
-
-#endif  // defined(__cplusplus), end of unaligned API
-
-#endif  // ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
diff --git a/third_party/abseil_cpp/absl/base/internal/unique_small_name_test.cc b/third_party/abseil_cpp/absl/base/internal/unique_small_name_test.cc
deleted file mode 100644
index ff8c2b3fb427..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/unique_small_name_test.cc
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2020 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 "gtest/gtest.h"
-#include "absl/base/optimization.h"
-#include "absl/strings/string_view.h"
-
-// This test by itself does not do anything fancy, but it serves as binary I can
-// query in shell test.
-
-namespace {
-
-template <class T>
-void DoNotOptimize(const T& var) {
-#ifdef __GNUC__
-  asm volatile("" : "+m"(const_cast<T&>(var)));
-#else
-  std::cout << (void*)&var;
-#endif
-}
-
-int very_long_int_variable_name ABSL_INTERNAL_UNIQUE_SMALL_NAME() = 0;
-char very_long_str_variable_name[] ABSL_INTERNAL_UNIQUE_SMALL_NAME() = "abc";
-
-TEST(UniqueSmallName, NonAutomaticVar) {
-  EXPECT_EQ(very_long_int_variable_name, 0);
-  EXPECT_EQ(absl::string_view(very_long_str_variable_name), "abc");
-}
-
-int VeryLongFreeFunctionName() ABSL_INTERNAL_UNIQUE_SMALL_NAME();
-
-TEST(UniqueSmallName, FreeFunction) {
-  DoNotOptimize(&VeryLongFreeFunctionName);
-
-  EXPECT_EQ(VeryLongFreeFunctionName(), 456);
-}
-
-int VeryLongFreeFunctionName() { return 456; }
-
-struct VeryLongStructName {
-  explicit VeryLongStructName(int i);
-
-  int VeryLongMethodName() ABSL_INTERNAL_UNIQUE_SMALL_NAME();
-
-  static int VeryLongStaticMethodName() ABSL_INTERNAL_UNIQUE_SMALL_NAME();
-
- private:
-  int fld;
-};
-
-TEST(UniqueSmallName, Struct) {
-  VeryLongStructName var(10);
-
-  DoNotOptimize(var);
-  DoNotOptimize(&VeryLongStructName::VeryLongMethodName);
-  DoNotOptimize(&VeryLongStructName::VeryLongStaticMethodName);
-
-  EXPECT_EQ(var.VeryLongMethodName(), 10);
-  EXPECT_EQ(VeryLongStructName::VeryLongStaticMethodName(), 123);
-}
-
-VeryLongStructName::VeryLongStructName(int i) : fld(i) {}
-int VeryLongStructName::VeryLongMethodName() { return fld; }
-int VeryLongStructName::VeryLongStaticMethodName() { return 123; }
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/base/internal/unscaledcycleclock.cc b/third_party/abseil_cpp/absl/base/internal/unscaledcycleclock.cc
deleted file mode 100644
index 1545288cf2de..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/unscaledcycleclock.cc
+++ /dev/null
@@ -1,138 +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/base/internal/unscaledcycleclock.h"
-
-#if ABSL_USE_UNSCALED_CYCLECLOCK
-
-#if defined(_WIN32)
-#include <intrin.h>
-#endif
-
-#if defined(__powerpc__) || defined(__ppc__)
-#ifdef __GLIBC__
-#include <sys/platform/ppc.h>
-#elif defined(__FreeBSD__)
-#include <sys/sysctl.h>
-#include <sys/types.h>
-#endif
-#endif
-
-#include "absl/base/internal/sysinfo.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace base_internal {
-
-#if defined(__i386__)
-
-int64_t UnscaledCycleClock::Now() {
-  int64_t ret;
-  __asm__ volatile("rdtsc" : "=A"(ret));
-  return ret;
-}
-
-double UnscaledCycleClock::Frequency() {
-  return base_internal::NominalCPUFrequency();
-}
-
-#elif defined(__x86_64__)
-
-int64_t UnscaledCycleClock::Now() {
-  uint64_t low, high;
-  __asm__ volatile("rdtsc" : "=a"(low), "=d"(high));
-  return (high << 32) | low;
-}
-
-double UnscaledCycleClock::Frequency() {
-  return base_internal::NominalCPUFrequency();
-}
-
-#elif defined(__powerpc__) || defined(__ppc__)
-
-int64_t UnscaledCycleClock::Now() {
-#ifdef __GLIBC__
-  return __ppc_get_timebase();
-#else
-#ifdef __powerpc64__
-  int64_t tbr;
-  asm volatile("mfspr %0, 268" : "=r"(tbr));
-  return tbr;
-#else
-  int32_t tbu, tbl, tmp;
-  asm volatile(
-      "0:\n"
-      "mftbu %[hi32]\n"
-      "mftb %[lo32]\n"
-      "mftbu %[tmp]\n"
-      "cmpw %[tmp],%[hi32]\n"
-      "bne 0b\n"
-      : [ hi32 ] "=r"(tbu), [ lo32 ] "=r"(tbl), [ tmp ] "=r"(tmp));
-  return (static_cast<int64_t>(tbu) << 32) | tbl;
-#endif
-#endif
-}
-
-double UnscaledCycleClock::Frequency() {
-#ifdef __GLIBC__
-  return __ppc_get_timebase_freq();
-#elif defined(__FreeBSD__)
-  static once_flag init_timebase_frequency_once;
-  static double timebase_frequency = 0.0;
-  base_internal::LowLevelCallOnce(&init_timebase_frequency_once, [&]() {
-    size_t length = sizeof(timebase_frequency);
-    sysctlbyname("kern.timecounter.tc.timebase.frequency", &timebase_frequency,
-                 &length, nullptr, 0);
-  });
-  return timebase_frequency;
-#else
-#error Must implement UnscaledCycleClock::Frequency()
-#endif
-}
-
-#elif defined(__aarch64__)
-
-// System timer of ARMv8 runs at a different frequency than the CPU's.
-// The frequency is fixed, typically in the range 1-50MHz.  It can be
-// read at CNTFRQ special register.  We assume the OS has set up
-// the virtual timer properly.
-int64_t UnscaledCycleClock::Now() {
-  int64_t virtual_timer_value;
-  asm volatile("mrs %0, cntvct_el0" : "=r"(virtual_timer_value));
-  return virtual_timer_value;
-}
-
-double UnscaledCycleClock::Frequency() {
-  uint64_t aarch64_timer_frequency;
-  asm volatile("mrs %0, cntfrq_el0" : "=r"(aarch64_timer_frequency));
-  return aarch64_timer_frequency;
-}
-
-#elif defined(_M_IX86) || defined(_M_X64)
-
-#pragma intrinsic(__rdtsc)
-
-int64_t UnscaledCycleClock::Now() { return __rdtsc(); }
-
-double UnscaledCycleClock::Frequency() {
-  return base_internal::NominalCPUFrequency();
-}
-
-#endif
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_USE_UNSCALED_CYCLECLOCK
diff --git a/third_party/abseil_cpp/absl/base/internal/unscaledcycleclock.h b/third_party/abseil_cpp/absl/base/internal/unscaledcycleclock.h
deleted file mode 100644
index 82f2c87a95a9..000000000000
--- a/third_party/abseil_cpp/absl/base/internal/unscaledcycleclock.h
+++ /dev/null
@@ -1,124 +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.
-//
-// UnscaledCycleClock
-//    An UnscaledCycleClock yields the value and frequency of a cycle counter
-//    that increments at a rate that is approximately constant.
-//    This class is for internal use only, you should consider using CycleClock
-//    instead.
-//
-// Notes:
-// The cycle counter frequency is not necessarily the core clock frequency.
-// That is, CycleCounter cycles are not necessarily "CPU cycles".
-//
-// An arbitrary offset may have been added to the counter at power on.
-//
-// On some platforms, the rate and offset of the counter may differ
-// slightly when read from different CPUs of a multiprocessor.  Usually,
-// we try to ensure that the operating system adjusts values periodically
-// so that values agree approximately.   If you need stronger guarantees,
-// consider using alternate interfaces.
-//
-// The CPU is not required to maintain the ordering of a cycle counter read
-// with respect to surrounding instructions.
-
-#ifndef ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_H_
-#define ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_H_
-
-#include <cstdint>
-
-#if defined(__APPLE__)
-#include <TargetConditionals.h>
-#endif
-
-#include "absl/base/port.h"
-
-// The following platforms have an implementation of a hardware counter.
-#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
-  defined(__powerpc__) || defined(__ppc__) || \
-  defined(_M_IX86) || defined(_M_X64)
-#define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 1
-#else
-#define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 0
-#endif
-
-// The following platforms often disable access to the hardware
-// counter (through a sandbox) even if the underlying hardware has a
-// usable counter. The CycleTimer interface also requires a *scaled*
-// CycleClock that runs at atleast 1 MHz. We've found some Android
-// ARM64 devices where this is not the case, so we disable it by
-// default on Android ARM64.
-#if defined(__native_client__) ||                      \
-    (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \
-    (defined(__ANDROID__) && defined(__aarch64__))
-#define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT 0
-#else
-#define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT 1
-#endif
-
-// UnscaledCycleClock is an optional internal feature.
-// Use "#if ABSL_USE_UNSCALED_CYCLECLOCK" to test for its presence.
-// Can be overridden at compile-time via -DABSL_USE_UNSCALED_CYCLECLOCK=0|1
-#if !defined(ABSL_USE_UNSCALED_CYCLECLOCK)
-#define ABSL_USE_UNSCALED_CYCLECLOCK               \
-  (ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION && \
-   ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT)
-#endif
-
-#if ABSL_USE_UNSCALED_CYCLECLOCK
-
-// This macro can be used to test if UnscaledCycleClock::Frequency()
-// is NominalCPUFrequency() on a particular platform.
-#if  (defined(__i386__) || defined(__x86_64__) || \
-      defined(_M_IX86) || defined(_M_X64))
-#define ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
-#endif
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace time_internal {
-class UnscaledCycleClockWrapperForGetCurrentTime;
-}  // namespace time_internal
-
-namespace base_internal {
-class CycleClock;
-class UnscaledCycleClockWrapperForInitializeFrequency;
-
-class UnscaledCycleClock {
- private:
-  UnscaledCycleClock() = delete;
-
-  // Return the value of a cycle counter that counts at a rate that is
-  // approximately constant.
-  static int64_t Now();
-
-  // Return the how much UnscaledCycleClock::Now() increases per second.
-  // This is not necessarily the core CPU clock frequency.
-  // It may be the nominal value report by the kernel, rather than a measured
-  // value.
-  static double Frequency();
-
-  // Allowed users
-  friend class base_internal::CycleClock;
-  friend class time_internal::UnscaledCycleClockWrapperForGetCurrentTime;
-  friend class base_internal::UnscaledCycleClockWrapperForInitializeFrequency;
-};
-
-}  // namespace base_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_USE_UNSCALED_CYCLECLOCK
-
-#endif  // ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_H_