[llvm] [VPlan] Allow tail folding with uncountable early exits (PR #174974)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp llvm/lib/Transforms/Vectorize/VPlanPredicator.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.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/VPlanPredicator.cpp b/llvm/lib/Transforms/Vectorize/VPlanPredicator.cpp
index 2744ed35d..aa85e9321 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanPredicator.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanPredicator.cpp
@@ -310,7 +310,7 @@ VPlanTransforms::introduceMasksAndLinearize(VPlan &Plan, bool FoldTail) {
            "only a single-exit block is supported currently");
     // exit block must be either vector.early.exit or middle.block
     assert(is_contained(Plan.getExitBlocks().front()->predecessors(),
-			Plan.getMiddleBlock()) &&
+                        Plan.getMiddleBlock()) &&
            "the exit block must have middle block as a predecessor");
 
     VPBuilder B(Plan.getMiddleBlock()->getTerminator());

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https://github.com/llvm/llvm-project/pull/174974