VmInstanceField field, Register refReg, Register valueReg) {
VmInstanceField field, Register refReg, Register valueReg, Register scratchReg) {
    public final void writePutfieldWriteBarrier(X86CompilerContext context,            VmInstanceField field, Register refReg, Register valueReg) {        if (field.isObjectRef()) {            writePUSH(refReg);            writePUSH(field.getOffset());            writePUSH(valueReg);            invokeJavaMethod(context.getPutfieldWriteBarrier(), context);        }    }