setEndPrologueOffset(ir.MIRInfo.instAfterPrologue.getmcOffset());
  public final void createFinalMCMap (OPT_IR ir, int machineCodeLength) throws InterruptiblePragma {    _mcMap = new VM_OptMachineCodeMap(ir, machineCodeLength);    setEndPrologueOffset(ir.MIRInfo.instAfterPrologue.getmcOffset());  }