Arthur O'Dwyer d0eaf75320 [libc++] Remove non-atomic "platform" semaphore implementations. ...

These can't be made constexpr-constructible (constinit'able),
so they aren't C++20-conforming. Also, the platform versions are
going to be bigger than the atomic/futex version, so we'd have
the awkward situation that `semaphore<42>` could be bigger than
`semaphore<43>`, and that's just silly.

Differential Revision: https://reviews.llvm.org/D110110

2021-11-04 14:33:34 -04:00

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