[llvm] [VPlan] Implement interleaving as VPlan-to-VPlan transform. (PR #95842)

[Florian Hahn via llvm-commits]

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@@ -1690,6 +1704,13 @@ void VPScalarIVStepsRecipe::execute(VPTransformState &State) {
   }
 }
 
+unsigned VPScalarIVStepsRecipe::getUnrollPartOperand() const {
+  return getNumOperands() == 2
+             ? 0
+             : cast<ConstantInt>(getOperand(2)->getLiveInIRValue())
+                   ->getZExtValue();
+}
+
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fhahn wrote:

I left it as is as per discussion above about introducing the separate getUnrollPartOperand that are only used by getUnrollPart(), happy to apply if preferred

https://github.com/llvm/llvm-project/pull/95842