8162546: change hidden options -Xdebug to --debug, -XshouldStop to --should-stop, and -diags to --diagsReviewed-by: mcimadamore
8161020: javac, fold stop compilation optionsReviewed-by: mcimadamore
8026963: type annotations code crashes for code with erroneous treesReviewed-by: jjg, jlahoda