RFR: 8367450: Shenandoah: Log the composition of the collection set [v6]

[Y. Srinivas Ramakrishna]

On Thu, 18 Sep 2025 16:08:34 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Reuse the same log message from GenShen which details the composition of the live data to be evacuated. In the non-generational modes, all regions are considered young and nothing will be promoted (or old).
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve documentation for methods touched in this change

Thank you! 🚢

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Marked as reviewed by ysr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27235#pullrequestreview-3241461808