8162546: change hidden options -Xdebug to --debug, -XshouldStop to --should-stop, and -diags to --diagsReviewed-by: mcimadamore
8161019: javac, fold formatter optionsReviewed-by: mcimadamore, jjg
8078024: javac, several incorporation steps are silently failing when an error should be reportedReviewed-by: mcimadamore