RFR: 8369277: Remove unused CodeCacheUnloadingTask::_num_workers [v4]

[Aleksey Shipilev]

On Tue, 7 Oct 2025 13:17:12 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Trivial removing dead code.
>> 
>> Test: tier1
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27671#pullrequestreview-3311065351