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

[via llvm-commits]

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@@ -2811,15 +2829,15 @@ void VPlanTransforms::canonicalizeEVLLoops(VPlan &Plan) {
   // Replace CanonicalIVInc with EVL-PHI increment.
   auto *CanonicalIV = cast<VPPhi>(&*HeaderVPBB->begin());
   VPValue *Backedge = CanonicalIV->getIncomingValue(1);
-  assert(match(Backedge, m_c_Add(m_Specific(CanonicalIV),
-                                 m_Specific(&Plan.getVFxUF()))) &&
-         "Unexpected canonical iv");
-  Backedge->replaceAllUsesWith(EVLIncrement);
-
-  // Remove unused phi and increment.
-  VPRecipeBase *CanonicalIVIncrement = Backedge->getDefiningRecipe();
-  CanonicalIVIncrement->eraseFromParent();
-  CanonicalIV->eraseFromParent();
+  if (match(Backedge,
+            m_c_Add(m_Specific(CanonicalIV), m_Specific(&Plan.getVFxUF())))) {
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ayalz wrote:

Checked rather than asserted now?

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