RFR: 8367473: Shenandoah: Make the detailed evacuation metrics a runtime diagnostic option [v3]

[Paul Hohensee]

On Thu, 18 Sep 2025 16:13:25 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Non-product builds currently have a feature to produce detailed metrics about evacuations (number of objects, number of bytes, split out by age (young, old, promotion) and thread (mutator or worker). This change makes this feature accessible in release builds as a diagnostic option.
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix typo in option description

Marked as reviewed by phh (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27238#pullrequestreview-3240997697