[llvm] [VPlan] Rename isUniform(AfterVectorization) to isSingleScalar (NFC). (PR #140134)

[via llvm-commits]

================
@@ -347,7 +347,7 @@ static VPRegionBlock *createReplicateRegion(VPReplicateRecipe *PredRecipe,
   auto *RecipeWithoutMask = new VPReplicateRecipe(
       PredRecipe->getUnderlyingInstr(),
       make_range(PredRecipe->op_begin(), std::prev(PredRecipe->op_end())),
-      PredRecipe->isUniform(), nullptr /*Mask*/, *PredRecipe);
+      PredRecipe->isSingleScalar(), nullptr /*Mask*/, *PredRecipe);
----------------
ayalz wrote:

Independent: is PredRecipe->isSingleScalar() known to be false?

https://github.com/llvm/llvm-project/pull/140134