8205648: fix for 8205195 breaks secondary error handling
Summary: Only grab Threads_lock in VMError::controlled_crash() when we don't already own it.
Reviewed-by: sspitsyn, stuefe
^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/.*