RFR: 8303151: DCmd framework cleanups

[David Holmes]

On Fri, 3 Mar 2023 06:17:14 GMT, Yi Yang <yyang at openjdk.org> wrote:

> Is it possible to remove DCmdRegistrant too?

Thanks for looking at this. Yes this would be possible I think. Not sure why the `DCmdRegistrant` class was considered necessary ... probably to support alternative implementations of `register_dcmd_ext()`. I think it could reside in the DCmd class.

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PR: https://git.openjdk.org/jdk/pull/12847