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

8153407: javac, fold debug options
Reviewed-by: mcimadamore, jjg

7098660: Write better overload resolution/inference tests
Summary: Add overload/inference debug diagnostics - added test harness using annotations to check outcome of overload resolution/inference
Reviewed-by: jjg