[llvm] [VPlan] Unroll VPReplicateRecipe by VF. (PR #142433)

[via llvm-commits]

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@@ -224,6 +224,9 @@ struct Recipe_match {
     if ((!matchRecipeAndOpcode<RecipeTys>(R) && ...))
       return false;
 
+    auto *VPI = dyn_cast<VPInstruction>(R);
+    if (VPI && VPI->getOpcode() == VPInstruction::BuildVector)
+      return true;
     assert(R->getNumOperands() == std::tuple_size<Ops_t>::value &&
            "recipe with matched opcode does not have the expected number of "
            "operands");
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ayalz wrote:

Independent nit: worth noting below that "Commutative" checks operands in reverse order, which works best for binary operations.

https://github.com/llvm/llvm-project/pull/142433