[AArch64][llvm] Add support for Permission Overlays Extension 2 (FEAT_S1POE2)#164912

jthackray wants to merge 2 commits intomainllvm/llvm-project:mainfrom

users/jthackray/armvfat-poe2llvm/llvm-project:users/jthackray/armvfat-poe2Copy head branch name to clipboard