[llvm] [AArch64] Lower fixed find_last_active to LASTP with SVE2.2 (PR #222534)

[Vimal Patel via llvm-commits]

pvimal816a wrote:

> Thank you Vimal for the patch. I left some comments, let me know if they are ok

Thanks for the review. Addressed most of them.

https://github.com/llvm/llvm-project/pull/222534