[llvm] [Intrinsics][AArch64] Add intrinsic to mask off aliasing vector lanes (PR #117007)

[Sam Tebbs via llvm-commits]

https://github.com/SamTebbs33 commented:

Thanks Paul and Ben for letting me know about `experimental` going away. I've renamed the intrinsic to remove that part.

https://github.com/llvm/llvm-project/pull/117007