RFR: 8252842: Extend jmap to support parallel heap dump

[Chris Plummer]

On Thu, 28 Jan 2021 07:30:29 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> 8252842: Extend jmap to support parallel heap dump
>
> Hi Lin,
> It is also in my memory that you actually did not have 4 arguments.
> The real incompatibility issue was that the order of arguments was swapped.
> It is why it was relatively easy to fall back and just update the constants with 3 instead of 4 and swap the order of arguments back.
> Thanks,
> Serguei

@sspitsyn or @schmelter-sap Can one of you provide a second review for this change. The GC team would like to start a review for changes that will heavily impact this same code, so it would be best if these changes could be pushed first.

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