[llvm] [OptBisect] Add opt-bisect-skip option for skipping passes during bisection (PR #152393)

[Alex MacLean via llvm-commits]

https://github.com/AlexMaclean approved this pull request.

Nice, I personally use this feature in our down-stream fork and find it to be a nice complement to --opt-bisect-limit when investigating correctness issues. Please wait for some more review prior to landing. 

https://github.com/llvm/llvm-project/pull/152393