RFR(XS): JDK-8199780: SetMemory0 and CopyMemory0 in unsafe.cpp need to resolve their operands

[Roman Kennke]

> 
>> Diff:
>> http://cr.openjdk.java.net/~rkennke/JDK-8199780/webrev.01.diff/
>> Full:
>> http://cr.openjdk.java.net/~rkennke/JDK-8199780/webrev.01/
>>
>> Better now?
> 
> Yes, much better. It looks good now. Thank you.

Erik: Thank you for reviewing.

I believe this needs one more review, doesn't it?

Thanks, Roman