RFR: 8369980: Use ThreadsClaimTokenScope in ShenandoahThreadRoots

[Francesco Andreuzzi]

On Thu, 16 Oct 2025 11:14:53 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> The explicit usage of `Threads::change_thread_claim_token` and `Threads::assert_all_threads_claimed` in `ShenandoahThreadRoots` can be replaced with `ThreadsClaimTokenScope`.
>> 
>> Passes tier1, tier2, tier[1,2,3]_gc_shenandoah (fastdebug).
>
> Marked as reviewed by ayang (Reviewer).

Thanks for the review @albertnetymk and @earthling-amzn.

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PR Comment: https://git.openjdk.org/jdk/pull/27845#issuecomment-3414666821