[clang] [llvm] [CloneFunction] Fix non-deterministic PHI cleanup using PHINode::removeIncomingValueIf() (PR #173975)

[Nikita Popov via cfe-commits]

https://github.com/nikic commented:

Would it be possible to separate the CloneFunction change from reapplying the IR change?

https://github.com/llvm/llvm-project/pull/173975