[llvm] [AArch64][PAC] Support BLRA* instructions in SLS Hardening pass (PR #97605)

[Daniil Kovalev via llvm-commits]

https://github.com/kovdan01 commented:

LGTM with very minor comments, so I'm OK with merging this when @kbeyls gives his final approval.

https://github.com/llvm/llvm-project/pull/97605