[llvm] [SSAUpdater][NFC] Limit search for matching phi-node (PR #195744)

[Valery Pykhtin via llvm-commits]

https://github.com/vpykhtin commented:

I'm not sure this is the best way to improve performance:

Please take a look at llvm::EliminateDuplicatePHINodes - it has EliminateDuplicatePHINodesSetBasedImpl for such cases.

https://github.com/llvm/llvm-project/pull/195744