[llvm] [BOLT] Improve InsertNegateRAStatePass::inferUnknownStates (PR #163381)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

Hi Gergely, thanks for the patch. For testing purposes, if we had a way to run a selected optimization pass without running anything else, would it help? E.g. `--pass-list=mark-ra-states,insert-negate-ra-state-pass,finalize-functions` will only run those three and not the rest. Some passes that are run at the end, e.g. `InstructionLowering` are mandatory and we can add them by default. But you will have  the ability to test IR after every pass using `--print-after...`. 

https://github.com/llvm/llvm-project/pull/163381