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

[David Sherwood via cfe-commits]

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

This looks good to me, but I think it needs rebasing after https://github.com/llvm/llvm-project/pull/72849 landed. It also looks like @sdesmalen-arm left a comment about renaming ImmToTile - perhaps that could be done in this patch?

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