8218941: jdb should support a dbgtrace command that acts the same as the dbgtrace command line option
Summary: added dbgtrace command.
Reviewed-by: sspitsyn, amenkov, gadams
/build/
/dist/
/.idea/
nbproject/private/
/webrev
/.src-rev
/.jib/
.DS_Store
.metadata/
.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
**/JTreport/**
**/JTwork/**