[clang] Clang: Add elementwise minnum/maxnum builtin functions (PR #129207)

[YunQiang Su via cfe-commits]

wzssyqa wrote:

> Needs the documentation updates in clang language extensions with the other elementwise builtins, and a release note

Documentation updated.
And ReleaseNotes is submitted as a new PR: https://github.com/llvm/llvm-project/pull/131977

https://github.com/llvm/llvm-project/pull/129207