[llvm] [SimplifyCFG] Add command-line option to disable the pass (PR #130965)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I don't think adding an option to disable simplifycfg makes a lot of sense. This is a core pass that does a lot more than just if conversion.

This seems like something that should be kept downstream for experimentation purposes.

https://github.com/llvm/llvm-project/pull/130965