[issue33351] Support compiling with clang-cl on Windows

[Ethan Smith]

Ethan Smith <ethan at ethanhs.me> added the comment:

I sent my patches to clang-cl upstream [1]. It seems they want to implement Hardware Lock Elision (which is used by some MSVC compiler intrinsics in pyatomic.h) before implementing the needed intrinsics.

I have found temporary replacements that do not elide locks, but have effectively the same functional purpose as those intrinsics, so I should have a full PR for CPython ready soon.

[1] https://reviews.llvm.org/D47672

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