[llvm] [VPlan] Add helper to run VPlan passes, verify after run (NFC). (PR #123640)

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git-clang-format --diff 62c16d82194f4c209fe9431deddf302827d37fb4 b63b50e3f46808b4cbb9ea1b9fa22d9d8b2df13c --extensions cpp,h -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlan.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.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 1ed0514585..df7dee32d5 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -9408,8 +9408,8 @@ LoopVectorizationPlanner::tryToBuildVPlanWithVPRecipes(VFRange &Range) {
   if (auto *UncountableExitingBlock =
           Legal->getUncountableEarlyExitingBlock()) {
     if (!VPlanTransforms::runPass(VPlanTransforms::handleUncountableEarlyExit,
-            *Plan, *PSE.getSE(), OrigLoop, UncountableExitingBlock,
-            RecipeBuilder)) {
+                                  *Plan, *PSE.getSE(), OrigLoop,
+                                  UncountableExitingBlock, RecipeBuilder)) {
       reportVectorizationFailure(
           "Some exit values in loop with uncountable exit not supported yet",
           "UncountableEarlyExitLoopsUnsupportedExitValue", ORE, OrigLoop);

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https://github.com/llvm/llvm-project/pull/123640