RFR: 8258142: Simplify G1RedirtyCardsQueue

[Kim Barrett]

On Mon, 14 Dec 2020 12:09:36 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Please review this change to G1RedirtyCardsQueue to separate the local qset
>> from the queue. This simplifies the implementation, though requires clients
>> to deal with the local qset explicitly. This is an enabling step toward
>> desired simplifications of the PtrQueue hierarchy. This change also
>> simplifies the interaction between the local qset and the global qset.
>> 
>> Testing:
>> mach5 tier1-5
>
> Lgtm. Thanks.

Thanks @tschatzl and @walulyai for reviewing.

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PR: https://git.openjdk.java.net/jdk/pull/1755