misched: Added MultiIssueItineraries.

This allows a subtarget to explicitly specify the issue width and
other properties without providing pipeline stage details for every
instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157979 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCSubtargetInfo.cpp

@@ -91,6 +91,8 @@ MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
     return InstrItineraryData();
   }
 
-  return InstrItineraryData(Stages, OperandCycles, ForwardingPathes,
-                            (InstrItinerary *)Found->Value);
+  InstrItinerarySubtargetValue *V =
+    (InstrItinerarySubtargetValue *)Found->Value;
+  return InstrItineraryData(V->Props, Stages, OperandCycles, ForwardingPathes,
+                            V->Itineraries);
 }