don't copy all itinerary data

llvm-svn: 26633
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp
index e088f71..55b68f8 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp
@@ -292,7 +292,7 @@
 ///
 void ScheduleDAGSimple::GatherSchedulingInfo() {
   // Get instruction itineraries for the target
-  const InstrItineraryData InstrItins = TM.getInstrItineraryData();
+  const InstrItineraryData &InstrItins = TM.getInstrItineraryData();
   
   // For each node
   for (unsigned i = 0, N = NodeCount; i < N; i++) {