[llvm] [clang] [SME2] Add LUTI2 and LUTI4 quad Builtins and Intrinsics (PR #73317)

[Sander de Smalen via llvm-commits]

https://github.com/sdesmalen-arm commented:

Looks mostly fine, just have a few nits.

https://github.com/llvm/llvm-project/pull/73317