Revert r178166. According to Howard, this code is actually ok.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178319 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/CodeGenSchedule.cpp

@@ -1105,9 +1105,7 @@ void PredTransitions::getIntersectingVariants(
       // Push another copy of the current transition for more variants.
       Variant.TransVecIdx = TransVec.size();
       IntersectingVariants.push_back(Variant);
-
-      PredTransition Trans = TransVec[TransIdx];
-      TransVec.push_back(Trans);
+      TransVec.push_back(TransVec[TransIdx]);
     }
   }
 }