8162546: change hidden options -Xdebug to --debug, -XshouldStop to --should-stop, and -diags to --diags
Reviewed-by: mcimadamore

8161020: javac, fold stop compilation options
Reviewed-by: mcimadamore

8076543: Add @modules as needed to the langtools tests
Reviewed-by: jjg, shurailine

8038788: javac behaves incorrectly for annotations after method type parameters in some cases
Reviewed-by: jjg, emc