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

[Florian Hahn via llvm-commits]

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@@ -9138,13 +9132,14 @@ static SmallVector<Instruction *> preparePlanForEpilogueVectorLoop(
     EPI.VectorTripCount = EPResumeVal->getOperand(0);
   }
   VPValue *VPV = Plan.getOrAddLiveIn(EPResumeVal);
+  VPValue *IV = VectorLoop->getCanonicalIV();
   assert(all_of(IV->users(),
                 [](const VPUser *U) {
-                  return isa<VPScalarIVStepsRecipe>(U) ||
-                         isa<VPDerivedIVRecipe>(U) ||
-                         cast<VPRecipeBase>(U)->isScalarCast() ||
-                         cast<VPInstruction>(U)->getOpcode() ==
-                             Instruction::Add;
+                  if (isa<VPScalarIVStepsRecipe>(U) || isa<VPDerivedIVRecipe>(U))
+                    return true;
+                  auto *R = cast<VPRecipeBase>(U);
+                  return R->isScalarCast() ||
+                         cast<VPInstruction>(R)->getOpcode() == Instruction::Add;
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fhahn wrote:

Restored although still shows up as changed

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