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

[Joshua Cranmer via cfe-commits]

https://github.com/jcranmer-intel commented:

Other side notes:

fmin and frexp can signal exceptions if the input is an sNaN, which causes [library.c]p3 to kick in. (That's the only time these operations can signal an exception.)

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