RFR: 8258508: Merge G1RedirtyCardsQueue into qset

[Kim Barrett]

On Mon, 1 Feb 2021 09:44:11 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Please review this change to G1RedirtyCardsLocalQueueSet to directly
>> incorporate the associated queue, simplifying usage.
>> 
>> Testing:
>> mach5 tier1
>
> Lgtm.

Thanks @tschatzl and @walulyai for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/2325