Export of internal Abseil changes

--
0f6565955231dc74ebad62ef32a18c457afa2dc7 by Abseil Team <absl-team@google.com>:

Document guarantee that we do not move from rvalue arguments if no insertion happens with absl::raw_hash_map::try_emplace, as done with std::unordered_map::try_emplace.

PiperOrigin-RevId: 264430409

--
292e6b9e08fa689e8400d7f2db94cbcab29d5889 by CJ Johnson <johnsoncj@google.com>:

Removes use of aligned_storage in FixedArray and InlinedVector in favor of aligned char buffers.

PiperOrigin-RevId: 264385559

--
aa0b19ad11ae5702022feee0e2e6434cfb28c9e9 by Derek Mauro <dmauro@google.com>:

Make the unit tests for absl::any, absl::optional, and absl::variant
no-ops when these types are just aliases for the corresponding std::
types. We have no way to fix standard library implementation bugs, so
don't bother working around them.

Also disable the corresponding exception-safety tests as well when
exceptions are not enabled.

Fixes https://github.com/abseil/abseil-cpp/pull/360

PiperOrigin-RevId: 264382050

--
65896a911f36481b89b4712c83b91c90a76b64e8 by Abseil Team <absl-team@google.com>:

Improve documentation on erase

PiperOrigin-RevId: 264381266
GitOrigin-RevId: 0f6565955231dc74ebad62ef32a18c457afa2dc7
Change-Id: I74b9bd2ddf84526014104f17e87de70bd3fe65fa

1 files changed, 5 insertions, 0 deletions

diff --git a/absl/types/variant_test.cc b/absl/types/variant_test.cc
index 85201b3ea6..56a6e01c61 100644
--- a/absl/types/variant_test.cc
+++ b/absl/types/variant_test.cc
@@ -19,6 +19,9 @@
 
 #include "absl/types/variant.h"
 
+// This test is a no-op when absl::variant is an alias for std::variant.
+#if !defined(ABSL_HAVE_STD_VARIANT)
+
 #include <algorithm>
 #include <cstddef>
 #include <functional>
@@ -2705,3 +2708,5 @@ TEST(VariantTest, MoveCtorBug) {
 
 }  // namespace
 }  // namespace absl
+
+#endif  // #if !defined(ABSL_HAVE_STD_VARIANT)