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

[via llvm-commits]

yafet-a wrote:

> Force push:
> * removed the `--allow-experimental-flag` for now. This caused several bugs, so it was best to remove it until I have a better solution.
Hi, was wondering which bugs in particular the allow-experimental-flag was raising and if any of them were related to instrumentation?


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