8208498: Put archive regions into a first-class HeapRegionSet
Summary: Maintain archive regions in a HeapRegionSet like other region types.
Reviewed-by: phh, sangheki
^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
.*/JTreport/.*
.*/JTwork/.*
.*/.git/.*