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

[Daniel D.Daugherty]

On Fri, 18 Dec 2020 17:41:15 GMT, Erik Österlund <eosterlund 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().
>
> One small nit about using Atomic::store(). Otherwise it looks good. Great that you found this and added a test so it won't bite us again.

@fisk - Thanks for the fast review. Fixed in the incremental that I just pushed.

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