[llvm] [VPlan] Add VPValue for VF, use it for VPWidenIntOrFpInductionRecipe. (PR #95305)

[Florian Hahn via llvm-commits]

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@@ -928,8 +928,19 @@ void VPlan::prepareToExecute(Value *TripCountV, Value *VectorTripCountV,
 
   IRBuilder<> Builder(State.CFG.PrevBB->getTerminator());
   // FIXME: Model VF * UF computation completely in VPlan.
-  VFxUF.setUnderlyingValue(
-      createStepForVF(Builder, TripCountV->getType(), State.VF, State.UF));
+  Value *RuntimeVF = nullptr;
+  if (VF.getNumUsers()) {
+    RuntimeVF = createStepForVF(Builder, TripCountV->getType(), State.VF, 1);
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fhahn wrote:

Sounds good, can update to `setVFAndUF` as a start separately? 

https://github.com/llvm/llvm-project/pull/95305