llvm-project

a293573c - [SSAUpdater] Only iterate blocks modified by CheckIfPHIMatches() in RecordMatchingPHIs() (#153596)

[SSAUpdater] Only iterate blocks modified by CheckIfPHIMatches() in RecordMatchingPHIs() (#153596) In https://github.com/llvm/llvm-project/pull/100281, we use `TaggedBlocks` to record blocks modified by `CheckIfPHIMatche()`, so do not need to clear every block in `BlockList` if `CheckIfPHIMatches()` match failed. If `CheckIfPHIMatches()` match succeed, we can reuse `TaggedBlocks` to only record matching PHIs for modified blocks, avoid checking every block in `BlockList` to see if `PHITag` is set.