[clang] [llvm] [Clang][LLVM][AArch64] Add intrinsic for LUTI4 SME2 instruction (#97755) (PR #109953)

[via llvm-commits]

https://github.com/SpencerAbson approved this pull request.

Thanks, there is some conflict from the [FSCALE work](https://github.com/llvm/llvm-project/pull/100128/files), but this LGTM.


https://github.com/llvm/llvm-project/pull/109953