[llvm] [VPlan] Remove PtrIV::IsScalarAfterVectorization, use VPlan analysis. (PR #168289)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h llvm/lib/Transforms/Vectorize/VPlan.h llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp --diff_from_common_commit
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 66b6ddcdb..826f80acd 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -7666,9 +7666,9 @@ VPRecipeBuilder::tryToOptimizeInductionPHI(VPInstruction *VPI) {
   // Check if this is pointer induction. If so, build the recipe for it.
   if (auto *II = Legal->getPointerInductionDescriptor(Phi)) {
     VPValue *Step = vputils::getOrCreateVPValueForSCEVExpr(Plan, II->getStep());
-    return new VPWidenPointerInductionRecipe(
-        Phi, VPI->getOperand(0), Step, &Plan.getVFxUF(), *II,
-        VPI->getDebugLoc());
+    return new VPWidenPointerInductionRecipe(Phi, VPI->getOperand(0), Step,
+                                             &Plan.getVFxUF(), *II,
+                                             VPI->getDebugLoc());
   }
   return nullptr;
 }

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https://github.com/llvm/llvm-project/pull/168289