RFR: 8258255: Move PtrQueue active flag to SATBMarkQueue [v2]

[Kim Barrett]

On Thu, 17 Dec 2020 15:09:04 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   tschatzl review
>
> Apart from that request with the comment, lgtm.

Thanks @tschatzl and @kstefanj for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/1820