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

[Mingjie Xu via cfe-commits]

Enna1 wrote:

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

Thanks. Drop the reapply change.

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