[llvm] [VPlan] Use VPInstruction for uniform binops. (PR #141429)

[via llvm-commits]

================
@@ -1069,10 +1072,19 @@ void VPInstructionWithType::execute(VPTransformState &State) {
   }
 }
 
+InstructionCost VPInstructionWithType::computeCost(ElementCount VF,
+                                                   VPCostContext &Ctx) const {
+  // TODO: Compute cost for VPInstructions without underlying values once
+  // the legacy cost model has been retired.
+  if (!getUnderlyingValue())
+    return 0;
+  return Ctx.getLegacyCost(cast<Instruction>(getUnderlyingValue()), VF);
+}
+
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 void VPInstructionWithType::print(raw_ostream &O, const Twine &Indent,
                                   VPSlotTracker &SlotTracker) const {
-  O << Indent << "EMIT ";
+  O << Indent << (isSingleScalar() ? "SINGLE-SCALAR " : "EMIT ");
----------------
ayalz wrote:

```suggestion
  O << Indent << "EMIT" << (isSingleScalar() ? "-SCALAR" : "") << " ";
```
consistent with VPInstruction::print().

https://github.com/llvm/llvm-project/pull/141429