RFR: 8077571: ObjPtrQueue is poorly named

[Kim Barrett]

[Sending to hotspot-dev because this touches runtime and compiler
files too. I'm particularly looking for a compiler person for the
change to HotSpotVMConfig.java.]

Please review this rename of ObjPtrQueue to SATBMarkQueue.  This
cleanup is being done in preparation for some further changes that
will make the name more widely used.

Probably the satbQueue.[ch]pp files should be renamed to
satbMarkQueue.[ch]pp.  I've not made such a change because my
understanding is that mercurial mq doesn't really understand file
renames.

CR:
https://bugs.openjdk.java.net/browse/JDK-8077571

Webrev:
http://cr.openjdk.java.net/~kbarrett/8077571/webrev.00/

Testing:
JPRT