544   MachineBasicBlock::iterator RegionBegin;  member
550     RegionBegin(B), RegionEnd(E), NumRegionInstrs(N) {}  in SchedRegion()
635       MachineBasicBlock::iterator I = R.RegionBegin;  in scheduleRegions()
805   if (&*RegionBegin == MI)  in moveInstruction()
806     ++RegionBegin;  in moveInstruction()
816   if (RegionBegin == InsertPos)  in moveInstruction()
817     RegionBegin = MI;  in moveInstruction()
959   CurrentTop = nextIfDebug(RegionBegin, RegionEnd);  in initQueues()
978     BB->splice(RegionBegin, BB, FirstDbgValue);  in placeDebugValues()
979     RegionBegin = FirstDbgValue;  in placeDebugValues()
987     if (&*RegionBegin == DbgValue)  in placeDebugValues()
988       ++RegionBegin;  in placeDebugValues()
1263   TopRPTracker.init(&MF, RegClassInfo, LIS, BB, RegionBegin,  in initRegPressure()
1308            BotRPTracker.getPos() == priorNonDebug(RegionEnd, RegionBegin))) &&  in initRegPressure()
1645     assert(TopRPTracker.getPos() == RegionBegin && "bad initial Top tracker");  in initQueues()