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3fad46c668edd864a62511f2a6875b8b79e38f34 by Evan Brown <ezb@google.com>:

Use switches instead of lookup tables for zap_desig_waker and ignore_waiting_writers so that we can avoid dTLB misses.

See, e.g., https://godbolt.org/z/a7Gb9vzzj.

Also, now that these are functions, follow function style in naming and comments.

PiperOrigin-RevId: 418654693

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ba5107744023a4e9163a44d706fbe8e4a1bc0fd9 by Abseil Team <absl-team@google.com>:

Check for Clang before attempting to expand __clang_major__.

This avoids a warning about an undefined macro on Windows when compiling with
MinGW-GCC.

PiperOrigin-RevId: 418287329
GitOrigin-RevId: 3fad46c668edd864a62511f2a6875b8b79e38f34
Change-Id: I28104980c4d3b204537b248447a6bd1022c9ef5d