[libc] [llvm] [libc][math][c23] Implement canonicalize functions (PR #85940)

[Shourya Goel via llvm-commits]

Sh0g0-1758 wrote:

Ah sorry for the delay. My OS crashed and I saw the dreaded white death screen. Had to set up my system from scratch. Thanks for the patch @nickdesaulniers. 

https://github.com/llvm/llvm-project/pull/85940