8189208: Cleanup ancient argument processing code
Summary: Remove bits thread_park_blocker, post_vm_init_hook_enabled and pending_list_uses_discovered_fields
Reviewed-by: hseigel, dholmes
^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/.*