[clang] [llvm] [C++23] [CLANG] Adding C++23 constexpr math functions: fmin, fmax and frexp. (PR #88978)

[Hubert Tong via llvm-commits]

hubert-reinterpretcast wrote:

> All the LIT tests failing are due to the latest changes I made. I will edit them once I know that the latest implementation is correct.

Thanks. I may be delayed in reviewing this as the C++ committee meeting is the week after next.

https://github.com/llvm/llvm-project/pull/88978