453   MachineBasicBlock::iterator RegionBegin;  member
459     RegionBegin(B), RegionEnd(E), NumRegionInstrs(N) {}  in SchedRegion()
541       MachineBasicBlock::iterator I = R->RegionBegin;  in scheduleRegions()
728   if (&*RegionBegin == MI)  in moveInstruction()
729     ++RegionBegin;  in moveInstruction()
739   if (RegionBegin == InsertPos)  in moveInstruction()
740     RegionBegin = MI;  in moveInstruction()
884   CurrentTop = nextIfDebug(RegionBegin, RegionEnd);  in initQueues()
903     BB->splice(RegionBegin, BB, FirstDbgValue);  in placeDebugValues()
904     RegionBegin = FirstDbgValue;  in placeDebugValues()
912     if (&*RegionBegin == DbgValue)  in placeDebugValues()
913       ++RegionBegin;  in placeDebugValues()
1012   TopRPTracker.init(&MF, RegClassInfo, LIS, BB, RegionBegin,  in initRegPressure()
1057            BotRPTracker.getPos() == priorNonDebug(RegionEnd, RegionBegin))) &&  in initRegPressure()
1396     assert(TopRPTracker.getPos() == RegionBegin && "bad initial Top tracker");  in initQueues()