[llvm] [VPlan] Consistently use (Part, 0) for first lane scalar values (PR #80271)

[Florian Hahn via llvm-commits]

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@@ -1801,7 +1811,10 @@ void VPReductionPHIRecipe::execute(VPTransformState &State) {
   for (unsigned Part = 0; Part < LastPartForNewPhi; ++Part) {
     Instruction *EntryPart = PHINode::Create(VecTy, 2, "vec.phi");
     EntryPart->insertBefore(HeaderBB->getFirstInsertionPt());
-    State.set(this, EntryPart, Part);
+    if (IsInLoop)
+      State.set(this, EntryPart, VPIteration(Part, 0));
+    else
+      State.set(this, EntryPart, Part);
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fhahn wrote:

Updated, thanks!

https://github.com/llvm/llvm-project/pull/80271