[llvm-branch-commits] [llvm] release/23.x: Revert "[SCEV] Speed up forgetLoop by avoiding def-use walk for loop-header PHIs" (#212485) (PR #214651)

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llvmbot wrote:

@antoniofrighetto @dtcxzyw What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/214651