[libc-commits] [libc] [libc][math][c23] Add acospif16() function (PR #132754)

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amemov wrote:

Have a problem with how exhaustive test file compares result - will need to update MPFRWrapper to support Acospi and compare results correctly in `libc/test/src/math/acospif16_test.cpp`. Other than that (and running `./clang-format` on the C++ files in the PR), should be ok. If you have corrections/suggestions about the implementation, please feel free to leave feedback. 

https://github.com/llvm/llvm-project/pull/132754