RFR: 8229258: Make markOopDesc AllStatic

[Roman Kennke]

>> - I know it would probably disturb even more code, but shouldn't the
>> files markOop.* be renamed to markWord.* ?
> 
> Somewhere in this thread (or maybe offline or in an earlier thread?) Stefan discussed
> this point and preferred to do the file renaming as a separate followup pass to avoid
> making this patch harder to maintain and review.  That seems like a good plan to me.

Good with me! :-)

Roman