[clang] [Clang] Add __builtin_(elementwise|reduce)_(max|min)imum (PR #110198)

[Nico Weber via cfe-commits]

nico wrote:

Looks like this breaks check-clang: http://45.33.8.238/linux/149333/step_6.txt

Please take a look and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/110198