[llvm] [VPlan] Use ResumePhi to create reduction resume phis. (PR #110004)

[via llvm-commits]

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@@ -7467,23 +7467,31 @@ static void addRuntimeUnrollDisableMetaData(Loop *L) {
 }
 
 // Check if \p RedResult is a ComputeReductionResult instruction, and if it is
-// create a merge phi node for it.
-static void createAndCollectMergePhiForReduction(
-    VPInstruction *RedResult,
-    VPTransformState &State, Loop *OrigLoop, BasicBlock *LoopMiddleBlock,
-    bool VectorizingEpilogue) {
+// create a merge phi node for it and add incoming values from the main vector
+// loop.
+static void updateAndCollectMergePhiForReductionForEpilogueVectorization(
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ayalz wrote:

"AndCollect" - this becomes obsolete w/o ReductionResumeValues?

https://github.com/llvm/llvm-project/pull/110004