Integrated: 8321937: GenShen: Sync up 21u based repo

[William Kemper]

On Fri, 8 Dec 2023 21:53:42 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Backport recent Shenandoah changes

This pull request has now been integrated.

Changeset: f680de9a
Author:    William Kemper <wkemper at openjdk.org>
URL:       https://git.openjdk.org/shenandoah-jdk21u/commit/f680de9a39ec699208e68600a854de849d321e21
Stats:     924 lines in 37 files changed: 438 ins; 225 del; 261 mod

8321937: GenShen: Sync up 21u based repo

Reviewed-by: kdnilsen

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PR: https://git.openjdk.org/shenandoah-jdk21u/pull/4