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

[Florian Hahn via llvm-commits]

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@@ -7493,40 +7501,15 @@ static void createAndCollectMergePhiForReduction(
          "when vectorizing the epilogue loop, we need a resume phi from main "
          "vector loop");
 
-  // TODO: bc.merge.rdx should not be created here, instead it should be
-  // modeled in VPlan.
   BasicBlock *LoopScalarPreHeader = OrigLoop->getLoopPreheader();
-  // Create a phi node that merges control-flow from the backedge-taken check
-  // block and the middle block.
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fhahn wrote:

Not entirely sure, but I think this meant the iterations checks.

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