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

8161019: javac, fold formatter options
Reviewed-by: mcimadamore, jjg

6971882: Remove -XDstdout from javac test
Reviewed-by: darcy

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