Avoid undefined behavior from passing a std::vector's own contents

in as an argument to push_back.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178166 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/TableGen/CodeGenSchedule.cpp b/utils/TableGen/CodeGenSchedule.cpp
index 818fce2048c5d1b228715edc285db47a6cebe91a..886c4c6394484bd86e2e1d0997fd70228264e316 100644 (file)
--- a/utils/TableGen/CodeGenSchedule.cpp
+++ b/utils/TableGen/CodeGenSchedule.cpp
@@ -1105,7 +1105,9 @@ void PredTransitions::getIntersectingVariants(
       // Push another copy of the current transition for more variants.
       Variant.TransVecIdx = TransVec.size();
       IntersectingVariants.push_back(Variant);
-      TransVec.push_back(TransVec[TransIdx]);
+
+      PredTransition Trans = TransVec[TransIdx];
+      TransVec.push_back(Trans);
     }
   }
 }