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

[Florian Hahn via llvm-commits]

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@@ -385,8 +391,8 @@ Value *VPInstruction::generateInstruction(VPTransformState &State,
     if (Part != 0)
       return nullptr;
     // First create the compare.
-    Value *IV = State.get(getOperand(0), Part);
-    Value *TC = State.get(getOperand(1), Part);
+    Value *IV = State.get(getOperand(0), VPIteration(0, 0));
+    Value *TC = State.get(getOperand(1), VPIteration(0, 0));
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fhahn wrote:

adjusted back, thanks

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