[llvm] [VPlan] Expand VPBlendRecipes to select instructions. NFC (PR #133993)

[Florian Hahn via llvm-commits]

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@@ -2711,6 +2711,20 @@ void VPlanTransforms::convertToConcreteRecipes(VPlan &Plan,
         continue;
       }
 
+      // Expand VPBlendRecipe into VPInstruction::Select
+      VPBuilder Builder(&R);
+      if (auto *Blend = dyn_cast<VPBlendRecipe>(&R)) {
+        VPValue *Select = Blend->getIncomingValue(0);
+        for (unsigned I = 1; I != Blend->getNumIncomingValues(); ++I) {
+          Select = Builder.createSelect(Blend->getMask(I),
+                                        Blend->getIncomingValue(I), Select,
+                                        R.getDebugLoc(), "predphi");
+          Select->setUnderlyingValue(Blend->getUnderlyingValue());
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fhahn wrote:

Do we need this in the latest version?

https://github.com/llvm/llvm-project/pull/133993