RFR: 8252842: Extend jmap to support parallel heap dump [v22]

[Chris Plummer]

On Thu, 6 May 2021 08:45:45 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> 8252842: Extend jmap to support parallel heap dump
>
> Lin Zang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   code refine and typo fix

I think you still need to undo the JMap.java changes since they are now being handled by #3598

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PR: https://git.openjdk.java.net/jdk/pull/2261