[clang] [llvm] [OptBisect][IR] Adding a new OptPassGate for disabling passes via name (PR #145059)

[Snehasish Kumar via llvm-commits]

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

Thanks for the review @nikic. 

@cristianassaiante I'll squash and merge the changes now. Thanks for contributing this feature to LLVM. 

https://github.com/llvm/llvm-project/pull/145059