RFR: 8365115: G1: Refactor rem set statistics gather code for group

[Albert Mingkun Yang]

On Fri, 8 Aug 2025 09:39:42 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change to remove some code duplication in group remset statistics gathering.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26691#pullrequestreview-3109240039