llvm-project

86813aa7 - [VPlan] Add dedicated user for resume phi with epilogue vectorization.

[VPlan] Add dedicated user for resume phi with epilogue vectorization. Epilogue vectorization currently relies on the resume phi for the canonical induction being always available, which is why VPPhi are considered to have side-effects, to prevent their removal. This patch adds a new ResumeForEpilogue opcode to mark the resume phi as used for epilogue vectorization. This allows treating VPPhis in general as not having side-effects, enabling removal of unused VPPhis.