[clang] [CIR][AArch64] Upstream pairwise-minimum NEON builtins (PR #191759)

[Andrzej Warzyński via cfe-commits]

https://github.com/banach-space approved this pull request.

Very nicely done, I only have 2 ultra-nits :) Thank you for contributing!

LGTM % nits

https://github.com/llvm/llvm-project/pull/191759