RFR: 8318026: jcmd should provide access to low-level JVM debug information

[Ludvig Janiuk]

On Thu, 1 Feb 2024 15:47:24 GMT, Ludvig Janiuk <lujaniuk at openjdk.org> wrote:

>> Introduce the jcmd "VM.debug" to implement access to a useful set of the established debug.cpp utilities, with "jcmd PID VM.debug subcommand ...".
>> 
>> Not recommended for live production use.  Calling these "debug" utilities, and not including them in the jcmd help output, is to remind us they are not general customer-facing tools.
>
> test/hotspot/jtreg/serviceability/dcmd/vm/VMDebugTest.java line 201:
> 
>> 199:         run(new JMXExecutor());
>> 200:     }
>> 201:    */
> 
> comment to remove

plus some formatting below in this file

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PR Review Comment: https://git.openjdk.org/jdk/pull/17655#discussion_r1474688937