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

[Florian Hahn via llvm-commits]

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@@ -1254,6 +1262,10 @@ void VPlanIngredient::print(raw_ostream &O) const {
 
 template void DomTreeBuilder::Calculate<VPDominatorTree>(VPDominatorTree &DT);
 
+bool VPValue::isDefinedOutsideVectorRegions() const {
+  return !hasDefiningRecipe() || !getDefiningRecipe()->getParent()->getParent();
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fhahn wrote:

Updated, thanks! Might be best to rename uses of vector region to loop region, as we also handle the interleaving-only case?

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