RFR: 8229258: Make markOopDesc AllStatic

[Kim Barrett]

> On Aug 8, 2019, at 6:57 PM, Roman Kennke <rkennke at redhat.com> wrote:
> - I agree with Coleen that markWord vs. MarkWord is a bit confusing. Not
> sure what to do though.

Stefan has a prototype that attempts to address this, but it has some problems.
I’m currently playing with it to see if I can fix them; some of the ideas are pretty
ugly though right now, and might not work anyway.  But I’m motivated to try,
because I really dislike those homonyms.