[llvm] [VPlan] Move structural loop-region verification to verifier. (PR #215079)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Vectorize/VPlan.cpp llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp llvm/unittests/Transforms/Vectorize/VPlanVerifierTest.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp b/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
index 93a6523ec..ecf5fea92 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
@@ -483,7 +483,8 @@ bool VPlanVerifier::verify(const VPlan &Plan) {
              [this](const VPBlockBase *VPB) { return !verifyBlock(VPB); }))
     return false;
 
-  // Check that the plan has a single loop region reachable from entry, and it matches the one returned by getVectorLoopRegion.
+  // Check that the plan has a single loop region reachable from entry, and it
+  // matches the one returned by getVectorLoopRegion.
   const VPRegionBlock *TopRegion = Plan.getVectorLoopRegion();
   if (any_of(VPBlockUtils::blocksOnly<const VPRegionBlock>(
                  vp_depth_first_shallow(Plan.getEntry())),

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https://github.com/llvm/llvm-project/pull/215079