RFR: 8336685: Shenandoah: Remove experimental incremental update mode [v3]

[Aleksey Shipilev]

On Thu, 25 Jul 2024 17:10:05 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> We've reason to believe that this mode is very rarely used and its maintenance has become a burden for future development.
>> 
>> ## Testing
>> * hotspot_gc_shenandoah
>> * dacapo
>> * diluvian
>> * extremem
>> * hyperalloc
>> * specjbb2015
>> * specjvm2008
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Simplify final mark now that incremental update mode is removed

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20316#pullrequestreview-2199950416