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

[Lin Zang]

On Mon, 10 May 2021 23:29:36 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> 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

Hi @plummercj ,
Thanks for your patience reviewing it over and over again! I have undo the JMap.java and sync with latest master.

BRs,
LIn

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