[llvm] [LV] Use frozen start value for FindLastIV if needed. (PR #132691)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlan.cpp llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp llvm/lib/Transforms/Vectorize/VPlanValue.h
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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 ce047ee9b..6aa6c9a2e 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -9905,7 +9905,7 @@ void LoopVectorizationPlanner::adjustRecipesForReductions(
       // Update all users outside the vector region.
       for (VPUser *U : to_vector(OrigExitingVPV->users())) {
         auto *R = cast<VPRecipeBase>(U);
-        if (R->getParent()->getParent() == VectorLoopRegion )
+        if (R->getParent()->getParent() == VectorLoopRegion)
           continue;
         R->replaceUsesOfWith(PhiR->getStartValue(), Start);
       }

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https://github.com/llvm/llvm-project/pull/132691