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

[Hamlin Li]

On Sat, 6 Feb 2021 04:54:01 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Copyrights need updating in two of the files.

Updated. 
BTW, I also updated the copyright for src/hotspot/share/gc/g1/heapRegionSet.cpp which I modified several weeks ago in https://bugs.openjdk.java.net/browse/JDK-8260200, but did not update the copyright at that time.

> 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.

My bad, thanks for pointing out. :-)

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