RFR: 8368599: ShenandoahConcurrentMark could use ThreadsClaimTokenScope

[William Kemper]

On Wed, 24 Sep 2025 22:37:44 GMT, Francesco Andreuzzi <fandreuzzi at openjdk.org> wrote:

> Replace `StrongRootsScope` with `ThreadsClaimTokenScope` in `ShenandoahConcurrentMark::finish_mark_work` to be more precise with what is actually needed and why. Similar to #27385.
> 
> Test: tier1, and tier[1,2,3]_gc_shenandoah

LGTM! Thank you.

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Marked as reviewed by wkemper (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27477#pullrequestreview-3265051449