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
6970584: Flow.java should be more error-friendlySummary: Added a post-attribution visitor that fixup uninitialized types/symbol in AST after erroneous attributionReviewed-by: jjg