RFR: JDK-8276422 Add command-line option to disable finalization [v4]

[David Holmes]

On Fri, 19 Nov 2021 20:13:06 GMT, Stuart Marks <smarks at openjdk.org> wrote:

>> Stuart Marks has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove Finalizer.Holder class.
>
> Regarding **jcmd** updates, I'm thinking maybe this would be better handled separately. There is the potential to update to `GC.finalizer_info` discussed previously. Looking at the **jcmd** tool docs, it seems like `GC.run_finalization` also ought to be updated. And maybe one or more of the other commands (maybe `VM.flags` or `VM.info`?) ought to list the finalization enabled or disabled status. And of course the tool's doc will need to be updated as well.

@stuart-marks no issue with doing dcmd/jcmd changes separately, but I don't think we need to go too far with this. I had considered `GC.run_finalization` but it just says it calls `System.run_finalization` - so no change needed there as it will be documented in System.runFinalization. And `VM.flags` only reports `-XX` flag information. And `VM.info` doesn't seem appropriate for mentioning this either. So no further changes needed to the other Dcmds IMO and no need to update anything on the jcmd tool page either.

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PR: https://git.openjdk.java.net/jdk/pull/6442