RFR: 8343782: G1: Use one G1CardSet instance for multiple old gen regions [v12]

[Ivan Walulya]

On Wed, 5 Feb 2025 15:05:21 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   space
>
> Marked as reviewed by ayang (Reviewer).

Thanks @albertnetymk and @tschatzl for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/22015#issuecomment-2642514964