[libc][math][c23] add c23 floating point fmaximum and fminimum functions. (#86016)

Fixes https://github.com/llvm/llvm-project/issues/85496.

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Co-authored-by: Job Hernandez <h93@protonmail.com>
GitOrigin-RevId: 3e3f0c3175a8b83a8c51bef5712dbc384385db8b
114 files changed