RFR: 8360790: G1: Improve HRRSStatsIter name

[Albert Mingkun Yang]

On Mon, 30 Jun 2025 11:32:08 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change that changes the names of some internal classes related to remembered set summaries to use the G1 prefix.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26042#pullrequestreview-2974716491