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76c5eb1cf346a1a64e0a5e2edf032546d600075a by Andy Getzendanner <durandal@google.com>:

Fix stacktrace on aarch64 architecture. Fixes #805

Import of https://github.com/abseil/abseil-cpp/pull/827

PiperOrigin-RevId: 340886173

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28f48f7bcadd4681854cddb0a7736d26d7dab000 by Andy Getzendanner <durandal@google.com>:

Some attribute cleanups in and around statusor:
* mark statusor_internal::Helper::Crash ABSL_ATTRIBUTE_NORETURN
* add ABSL_INTERNAL_UNREACHABLE to ABSL_INTERNAL_LOG when severity is FATAL
* create ABSL_INTERNAL_UNREACHABLE to wrap __builtin_unreachable and __assume(0)
* use ABSL_ATTRIBUTE_NONNULL instead of __builtin_unreachable in statusor_internal::PlacementNew (https://godbolt.org/z/n691fa)

PiperOrigin-RevId: 340868438

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33905d1d2d01eb6f81b04abaf24170bfebb6df09 by Andy Getzendanner <durandal@google.com>:

moved deleted functions to public for better compiler errors.

Import of https://github.com/abseil/abseil-cpp/pull/828

PiperOrigin-RevId: 340863976

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5e502222dfc3f5a0ef146535a9e16c743b005092 by Jorg Brown <jorg@google.com>:

ConvertibleToStringView wastes a lot of cycles initializing members just to reset them immediately after. Only initialize the string storage when needed. This makes StrSplit() 0-30% faster depending on the use case.

PiperOrigin-RevId: 340732039
GitOrigin-RevId: 76c5eb1cf346a1a64e0a5e2edf032546d600075a
Change-Id: I2ba1f717c4eaad384cd0a22694fd05f9e6a2d8fa