RFR: JDK-8261034: improve jcmd GC.class_histogram to support parallel [v5]

[Chris Plummer]

On Fri, 5 Feb 2021 02:47:01 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> parallel -histo of jmap was added by JDK-8214535, it's better to support parallel for jcmd GC.class_histogram too.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8261034: improve jcmd GC.class_histogram to support parallel

src/hotspot/share/services/diagnosticCommand.cpp line 560:

> 558:   _parallel_thread_num("-parallel",
> 559:        "Number of parallel threads for heap iteration. "
> 560:        "0 means let the VM determined the number of threads. "

Should be "determine". Sorry that was a typo in the text I suggested.

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PR: https://git.openjdk.java.net/jdk/pull/2379