RFR: 8350898: Shenandoah: Eliminate final roots safepoint [v2]

[Kelvin Nilsen]

On Mon, 21 Apr 2025 20:08:50 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Not clean. Conflicts with oop closure refactoring (8342588).
>
> William Kemper has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - Merge branch 'shenandoah-jdk21u-master' into backport-shenandoah-jdk21u-8350898
>  - 8350898: Shenandoah: Eliminate final roots safepoint
>    
>    Reviewed-by: rkennke, kdnilsen, cslucas

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah-jdk21u/pull/179#pullrequestreview-2788775604