public static void emitCompareAndExchangeField(VM_Assembler asm, int offset, byte srcReg) {
public static void emitCompareAndExchangeField(VM_Assembler asm, Offset offset, byte srcReg) {
  public static void emitCompareAndExchangeField(VM_Assembler asm, int offset, byte srcReg) {    asm.emitCMPXCHG_RegDisp_Reg(PROCESSOR_REGISTER, offset, srcReg);  }