llvm-project

53e7f9ad - [VPlan] Generalize header-phi detection in VPPhi::execute. (NFC) (#189352)

[VPlan] Generalize header-phi detection in VPPhi::execute. (NFC) (#189352) Generalize the header-phi detection in VPPhi::execute to use VPDT. This is currently NFC, but is needed to use VPPhi also for dissolving replicate regions (https://github.com/llvm/llvm-project/pull/186252). Split off from approved https://github.com/llvm/llvm-project/pull/186252 as suggested. PR: https://github.com/llvm/llvm-project/pull/189352