[llvm] [VPlan] Make canonical IV part of the region (PR #156262)

[via llvm-commits]

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@@ -103,20 +103,20 @@ VPValue::VPValue(const unsigned char SC, Value *UV, VPDef *Def)
 
 VPValue::~VPValue() {
   assert(Users.empty() && "trying to delete a VPValue with remaining users");
-  if (Def)
-    Def->removeDefinedValue(this);
+  if (VPDef *D = getDefiningRecipe())
+    D->removeDefinedValue(this);
 }
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 void VPValue::print(raw_ostream &OS, VPSlotTracker &SlotTracker) const {
-  if (const VPRecipeBase *R = dyn_cast_or_null<VPRecipeBase>(Def))
+  if (const VPRecipeBase *R = getDefiningRecipe())
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ayalz wrote:

nit: can be pre-applied independently

https://github.com/llvm/llvm-project/pull/156262