[clang] [Clang][SME2] Add single and multi min and max builtins (PR #71688)

[Kerry McLaughlin via cfe-commits]

https://github.com/kmclaughlin-arm approved this pull request.

Thanks @SamTebbs33, I just have one small suggestion but otherwise this LGTM.

https://github.com/llvm/llvm-project/pull/71688