8177076: jshell tool: allow non-zero /exit
8190383: JShell API: no way for the jshell tool to report exit status to provider
Reviewed-by: jlahoda
^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt