Replace deprecated _ReadWriteBarrier with std::atomic_signal_fence in MSVC path#2177
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LebedevRI merged 4 commits intogoogle:mainfrom Apr 24, 2026
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_ReadWriteBarrier() has been deprecated since MSVC 2015. This replaces
the three calls in the MSVC DoNotOptimize overloads with
std::atomic_signal_fence(std::memory_order_acq_rel), which is the
standard C++11 equivalent (compiler-only barrier, no hardware fence).
Same function is already used for ClobberMemory() in this file, and
is already included.
Fixes #747