[libcxx-commits] [libcxx] [libc++][test] Enhance `ADDITIONAL_COMPILE_FLAGS` to work with MSVC (PR #74974)

[Stephan T. Lavavej via libcxx-commits]

StephanTLavavej wrote:

I've created #75133 and would prefer to merge that PR, since I was able to locally suppress some warnings and remove some weirdness from `msvc_stdlib_force_include.h`. There are already a fair number of occurrences of using the macros for warning suppression, so it increases codebase consistency.

https://github.com/llvm/llvm-project/pull/74974