[llvm] [VPlan] Update final exit value via VPlan. (PR #112147)

[via llvm-commits]

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@@ -315,16 +315,20 @@ Value *VPTransformState::get(VPValue *Def, bool NeedsScalar) {
     LastLane = 0;
   }
 
-  auto *LastInst = cast<Instruction>(get(Def, LastLane));
-  // Set the insert point after the last scalarized instruction or after the
-  // last PHI, if LastInst is a PHI. This ensures the insertelement sequence
-  // will directly follow the scalar definitions.
+  auto *LastDef = get(Def, LastLane);
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ayalz wrote:

```suggestion
  Value *LastValue = get(Def, LastLane);
```
to clarify, given that `Def` is a `VPValue`?

https://github.com/llvm/llvm-project/pull/112147