RFR: 8273559: Shenandoah: Shenandoah should support multi-threaded heap dump [v3]

[Zhengyu Gu]

On Wed, 15 Sep 2021 09:48:16 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Zhengyu Gu has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
>> 
>>  - Merge
>>  - Aleksey and Severin's comments
>>  - 8273559: Shenandoah: Shenandoah should support multi-threaded heap dump
>
> Marked as reviewed by shade (Reviewer).

Thanks, @shipilev  @jerboaa  @rkennke

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PR: https://git.openjdk.java.net/jdk/pull/5473