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

[Anatoly Trosinenko via llvm-commits]

atrosinenko wrote:

This time, the failing test
```
TEST 'lldb-api :: functionalities/fork/concurrent_vfork/TestConcurrentVFork.py'
```
seems unrelated to this PR.

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