[jdk25u] RFR: 8365571: GenShen: PLAB promotions may remain disabled for evacuation threads

[duke]

On Mon, 18 Aug 2025 22:03:13 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Clean backport. Fixes performance issue with generational mode for Shenandoah.

@earthling-amzn 
Your change (at version a9be3d153a39bfea34114dcd28a06d3ee9a52a2c) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk25u/pull/100#issuecomment-3221329527