RFR: 8313962: G1: Refactor G1ConcurrentMark::_num_concurrent_workers

[Albert Mingkun Yang]

On Tue, 8 Aug 2023 17:30:52 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple cleanup to make this field track the correct number of gc-workers during marking. Some redundant asserts are removed as well. 
> 
> Test: hotspot_gc

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/15194#issuecomment-1686217468