[llvm] [BOLT][AArch64] Handle OpNegateRAState to enable optimizing binaries with pac-ret hardening (PR #120064)

[Paschalis Mpeis via llvm-commits]

https://github.com/paschalis-mpeis approved this pull request.

Looks good. There is no other ask on my end in this initial patch for PAC. Further improvements and features will follow-up as needed.

As discussed last night in Office Hours, Meta will have a look too, so please wait for their input.

Thanks again, Gergely!

https://github.com/llvm/llvm-project/pull/120064