RFR: 8368086: G1: Use ThreadsClaimTokenScope in G1CMRemarkTask

[Albert Mingkun Yang]

On Fri, 19 Sep 2025 10:16:13 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Are we guaranteed that active_workers are > 0 here?

Yes. There is at least one active worker, or we fail at startup, as shown in `WorkerThreads::initialize_workers`.

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PR Comment: https://git.openjdk.org/jdk/pull/27385#issuecomment-3311943106