474   MachineBasicBlock::iterator RegionBegin;  member
480     RegionBegin(B), RegionEnd(E), NumRegionInstrs(N) {}  in SchedRegion()
566       MachineBasicBlock::iterator I = R->RegionBegin;  in scheduleRegions()
736   if (&*RegionBegin == MI)  in moveInstruction()
737     ++RegionBegin;  in moveInstruction()
747   if (RegionBegin == InsertPos)  in moveInstruction()
748     RegionBegin = MI;  in moveInstruction()
890   CurrentTop = nextIfDebug(RegionBegin, RegionEnd);  in initQueues()
909     BB->splice(RegionBegin, BB, FirstDbgValue);  in placeDebugValues()
910     RegionBegin = FirstDbgValue;  in placeDebugValues()
918     if (&*RegionBegin == DbgValue)  in placeDebugValues()
919       ++RegionBegin;  in placeDebugValues()
1018   TopRPTracker.init(&MF, RegClassInfo, LIS, BB, RegionBegin,  in initRegPressure()
1063            BotRPTracker.getPos() == priorNonDebug(RegionEnd, RegionBegin))) &&  in initRegPressure()
1400     assert(TopRPTracker.getPos() == RegionBegin && "bad initial Top tracker");  in initQueues()