RFR: 8293623: Simplify G1ConcurrentRefineThreadControl [v11]

[Lei Zaakjyu]

On Tue, 19 Dec 2023 15:11:20 GMT, Lei Zaakjyu <duke at openjdk.org> wrote:

>> 8293623: Simplify G1ConcurrentRefineThreadControl
>
> Lei Zaakjyu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix

thanks for the review

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PR Comment: https://git.openjdk.org/jdk/pull/17077#issuecomment-1866459906