OPT_PhysicalRegisterSet phys = ir.regpool.getPhysicalRegisterSet();
  public static void allocateSpaceForSysCall(OPT_IR ir) {    OPT_PhysicalRegisterSet phys = ir.regpool.getPhysicalRegisterSet();    OPT_StackManager sm = (OPT_StackManager)ir.stackManager;        // add one to account for the processor register.      int nToSave = OPT_PhysicalRegisterSet.getNumberOfNonvolatileGPRs() + 1;    sm.allocateSpaceForSysCall(nToSave);  }