RFR: 8258284: clean up issues with nested ThreadsListHandles [v2]

[Daniel D.Daugherty]

On Tue, 22 Dec 2020 09:32:55 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Daniel D. Daugherty has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Resolve @fisk CR about using Atomic::store().
>
> Thanks

@robehn - Thanks for the review!

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PR: https://git.openjdk.java.net/jdk/pull/1844