[llvm] [VPlan] Fix crash with inloop fmuladd reductions with blend (PR #131154)

[Alexey Bataev via llvm-commits]

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@@ -9713,6 +9713,19 @@ void LoopVectorizationPlanner::adjustRecipesForReductions(
     // condition directly.
     VPSingleDefRecipe *PreviousLink = PhiR; // Aka Worklist[0].
     for (VPSingleDefRecipe *CurrentLink : Worklist.getArrayRef().drop_front()) {
+      if (auto *Blend = dyn_cast<VPBlendRecipe>(CurrentLink)) {
+        assert(Blend->getNumIncomingValues() == 2 &&
+               "Blend must have 2 incoming values");
+        if (Blend->getIncomingValue(0) == PhiR)
+          Blend->replaceAllUsesWith(Blend->getIncomingValue(1));
+        else {
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alexey-bataev wrote:

Enclose in braces

https://github.com/llvm/llvm-project/pull/131154