RFR: 8361726: Shenandoah: More detailed evacuation instrumentation [v4]

[Y. Srinivas Ramakrishna]

On Thu, 24 Jul 2025 18:38:13 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Shenandoah has `not product` instrumentation to track evacuation performance. This change introduces more detail by categorizing each evacuation as young, old or promotion.
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change wording in commment

Marked as reviewed by ysr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26222#pullrequestreview-3056328088