RFR: 8296954: G1: Enable parallel scanning for heap region remset [v2]

[Ivan Walulya]

On Fri, 18 Nov 2022 13:14:20 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Thomas review
>
> Lgtm.

Thanks @tschatzl and @albertnetymk for the reviews.

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PR: https://git.openjdk.org/jdk/pull/11173