RFR: 8229258: Make markOopDesc AllStatic

[Kim Barrett]

> On Aug 8, 2019, at 6:57 PM, Roman Kennke <rkennke at redhat.com> wrote:
> - 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.