RFR: 8329342: GenShen: Synchronize shenandoah-jdk21u:master with shenandoah:master

[William Kemper]

On Fri, 29 Mar 2024 16:40:12 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Pull in recent changes from shenandoah:master, _en masse_.

Zero build failure is a known issue and will be fixed by https://github.com/openjdk/shenandoah/pull/401

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PR Comment: https://git.openjdk.org/shenandoah-jdk21u/pull/29#issuecomment-2027707200