Add dom info verifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52967 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/LoopPass.cpp

@@ -234,6 +234,9 @@ bool LPPassManager::runOnFunction(Function &F) {
       recordAvailableAnalysis(P);
       removeDeadPasses(P, "", ON_LOOP_MSG);
 
+      // Verify dominator information if it is available and preserved.
+      verifyDomInfo(*LP, F);
+
       if (skipThisLoop)
         // Do not run other passes on this loop.
         break;