Reverting patch in revision 89758, initial attempt at fixing PR5373 has proven to be bogus.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89844 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/LoopUnswitch.cpp

@@ -296,6 +296,7 @@ static bool isTrivialLoopExitBlockHelper(Loop *L, BasicBlock *BB,
     // first exit.
     if (ExitBB != 0) return false;
     ExitBB = BB;
+    return true;
   }
   
   // Otherwise, this is an unvisited intra-loop node.  Check all successors.