Fix the bug in flag regsiter footprint tracking

We used to use getLeftBound() and getRightBound() to check the dependence. Now the architecture registers are using API ExRegNum and ExSubRegNum to get the register footprint

Author: bcheng0127

visa/LocalScheduler/SWSB_G4IR.cpp

@@ -1184,10 +1184,11 @@ SBFootprint *G4_BB_SB::getFootprintForFlag(G4_Operand *opnd,
   unsigned short RB = 0;
   G4_Type type = opnd->getType();
   bool valid = true;
+  unsigned regOff = opnd->getBase()->ExRegNum(valid);
   unsigned subRegOff = opnd->getBase()->ExSubRegNum(valid);
-  LB =
-      (unsigned short)(opnd->getLeftBound() + subRegOff * 16) * FLAG_TO_GRF_MAP;
-  RB = (unsigned short)(opnd->getRightBound() + subRegOff * 16) *
+  LB = (unsigned short)(regOff * 32 + subRegOff * 16) * FLAG_TO_GRF_MAP;
+  RB = (unsigned short)(regOff * 32 + subRegOff * 16 + opnd->getRightBound() -
+                        opnd->getLeftBound()) *
        FLAG_TO_GRF_MAP;
 
   LB += (builder.kernel.getNumRegTotal() + builder.getNumScalarRegisters() +