[llvm] [PredicateInfo] Support existing `PredicateType` by adding `PredicatePHI` when needing introduction of phi nodes (PR #151132)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

@Rajveer100 could you add a test that shows an improvement for a transform?

The description mentions this resolves https://github.com/llvm/llvm-project/issues/150606, but it doesn't look like there's a test case that shows an improvement?

The NewGVN and LoopVersioningLICM changes seem to just be artifacts of running the test update scripts?

https://github.com/llvm/llvm-project/pull/151132