getInstrItineraryData shouldn't copy the itineraries


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32448 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCSubtarget.h b/lib/Target/PowerPC/PPCSubtarget.h
index 1851024..1cce24d 100644
--- a/lib/Target/PowerPC/PPCSubtarget.h
+++ b/lib/Target/PowerPC/PPCSubtarget.h
@@ -57,7 +57,7 @@
   
   /// getInstrItins - Return the instruction itineraies based on subtarget 
   /// selection.
-  const InstrItineraryData getInstrItineraryData() const { return InstrItins; }
+  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
 
   /// getTargetDataString - Return the pointer size and type alignment
   /// properties of this subtarget.