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

[Florian Hahn via llvm-commits]

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@@ -9278,7 +9277,7 @@ void VPReductionRecipe::execute(VPTransformState &State) {
             NewVecOp);
       PrevInChain = NewRed;
     } else {
-      PrevInChain = State.get(getChainOp(), Part);
+      PrevInChain = State.get(getChainOp(), VPIteration(Part, 0));
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fhahn wrote:

Updated, thanks!

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