[llvm] [AArch64][PAC] Support BLRA* instructions in SLS Hardening pass (#97605) (PR #98062)

[Anatoly Trosinenko via llvm-commits]

atrosinenko wrote:

The only difference with the original version applied in #97605 and reverted in #97887 is copying the temporary created by `BuildMI` instead of taking reference in `populateThunk`:
```
-  auto &Builder =
+  MachineInstrBuilder Builder =
       BuildMI(Entry, DebugLoc(), TII->get(Kind.BROpcode)).addReg(AArch64::X16);
```

https://github.com/llvm/llvm-project/pull/98062