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

[via llvm-commits]

================
@@ -261,6 +261,14 @@ Value *VPTransformState::get(const VPValue *Def, const VPLane &Lane) {
     return Data.VPV2Scalars[Def][0];
   }
 
+  // Look through BuildVector to avoid redundant extracts.
+  // TODO: Remove once replicate regions are unrolled explicitly.
+  auto *BV = dyn_cast<VPInstruction>(Def);
----------------
ayalz wrote:

```suggestion
  auto *BuildV = dyn_cast<VPInstruction>(Def);
```


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