8159984: Remove call to ClassLoaderDataGraph::clear_claimed_marks during the initial mark pause Summary: The CLDG is only iterated once during garbage collection, so we do not need to claim CLDs any more. Reviewed-by: sjohanss, kbarrett

/build/
/dist/
/.idea/
nbproject/private/
/webrev
/.src-rev
/.jib/
.DS_Store
.metadata/
.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
**/JTreport/**
**/JTwork/**