ScoreboardHazardRecognizer.h - remove unnecessary llvm::InstrItineraryData forward declaration. NFC.

We have to include MCInstrItineraries.h where its defined.

Author: RKSimon

llvm/include/llvm/CodeGen/ScoreboardHazardRecognizer.h

@@ -23,7 +23,6 @@
 
 namespace llvm {
 
-class InstrItineraryData;
 class ScheduleDAG;
 class SUnit;