RFR: 8367731: G1: Make G1CollectionSet manage the young gen cset group [v3]

[Thomas Schatzl]

On Tue, 23 Sep 2025 10:44:18 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   * failed to save file with changes
>
> Marked as reviewed by iwalulya (Reviewer).

Thanks @walulyai @albertnetymk for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/27312#issuecomment-3323654943