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

[Lin Zang]

On Thu, 23 Sep 2021 13:07:46 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Thanks @schmelter-sap and @plummercj for your help review and approve this PR!
>> Since this is a non-trivial change, I would like to wait for 2 days before integrate it in case more comments from others.
>
> @linzang  this change is causing test crashes on Windows with ZGC and EpsilonGC - please see JDK-8274196

Thanks David @dholmes-ora,
I will take look at the issue. 

BRs,
Lin

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