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

[Lin Zang]

On Wed, 17 Feb 2021 04:30:45 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> > May I say that we all agreed that "noparallel" is not necessary at present? I think the PR #2519 and related CSR and issue could be all closed.
> 
> Yes, assuming we get approval for `dumpheapext`. Unfortunately the email that went out did not get any feedback. Maybe we should just create a CSR for that and see what the CSR committee says.

OK, I will create the CSR and update it in the email thread also.
Thanks!

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