8213914: [TESTBUG] Several JFR VM events are not covered by tests
Summary: Fixed several relevant test issues, added a test to check event coverage
Reviewed-by: egahlin
^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/.*