Enable test for MemoryBarrierProcessWide on arm64. Update comments. #35817
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Linux kernels that we run in the lab should have reliable implementation of
MemoryBarrierProcessWide
nowFixes:#11177
This is a test-only change.
While working on #35817 and looking at test coverage for
Volatile
I noticed that theMemoryBarrierProcessWide
test is still not enabled, while the issue should have been fixed.