8224741: Optimize the scan area during the Scan Heap Roots phase
Summary: When scanning card blocks, remember the last address already scanned. Continue scanning from this address.
Reviewed-by: kbarrett, lkorinth
^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/.*