RFR: 8365122: G1: Minor clean up of G1SurvivorRegions [v2]

[Thomas Schatzl]

On Mon, 11 Aug 2025 17:00:53 GMT, Sangheon Kim <sangheki at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   * add growablearray include
>
> Looks good.

Thanks @sangheon @kimbarrett for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/26692#issuecomment-3178363272