[llvm] [BOLT] Simplify RAState helpers (NFCI) (PR #162820)

[Paschalis Mpeis via llvm-commits]

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

Looks good, thanks for the simplification Gergely.

> Note: the way the errors are reported here does not have to be perfect, as the next PR (https://github.com/llvm/llvm-project/pull/163381) removes these and adds new errors.

👍, I may have some follow-up comments there too, on the users (ie insert-negate pass)

https://github.com/llvm/llvm-project/pull/162820