[llvm] [LV] Move predication, early exit & region handling to VPlan0 (NFCI) (PR #185305)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.h --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 6ab32b077..1ac679420 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -8134,8 +8134,7 @@ void LoopVectorizationPlanner::buildVPlansWithVPRecipes(ElementCount MinVF,
 
   VPlanTransforms::simplifyRecipes(*VPlan0);
   VPlanTransforms::handleEarlyExits(*VPlan0, Legal->hasUncountableEarlyExit());
-  VPlanTransforms::addMiddleCheck(*VPlan0,
-                                  CM.foldTailByMasking());
+  VPlanTransforms::addMiddleCheck(*VPlan0, CM.foldTailByMasking());
   RUN_VPLAN_PASS_NO_VERIFY(VPlanTransforms::createLoopRegions, *VPlan0);
   if (CM.foldTailByMasking())
     RUN_VPLAN_PASS_NO_VERIFY(VPlanTransforms::foldTailByMasking, *VPlan0);

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https://github.com/llvm/llvm-project/pull/185305