[clang] [C23] [CLANG] Adding C23 constexpr math functions: fmin and frexp. (PR #88978)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

C++23, not C23, right? (You should update the patch title and summary accordingly.)

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