RFR: 8252842: Extend jmap to support parallel heap dump [v32]

[Lin Zang]

On Mon, 6 Sep 2021 08:03:22 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:
> 
>   fix build error

Seems the #5410 has made some change that will affect this one. I am wondering should I start to rebase this PR based on that ? 

Thanks.
Lin

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