RFR: 8341630: G1: Adopt PartialArrayState to consolidate marking stack in concurrent marking [v4]

[Thomas Schatzl]

On Tue, 20 Jan 2026 11:34:46 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Hi,
>> 
>> Please review this change which adopts the `PartialArrayState` mechanism for G1 concurrent marking.
>> 
>> The `PartialArrayState` mechanism can push multiple continuations to the task queues, so it also solves the single-continuation limitation issue in [JDK-8167480](https://bugs.openjdk.org/browse/JDK-8167480).
>> 
>> Testing: Mach5 Tier 1-3.
>
> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Refactor

Still good.

-------------

Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29249#pullrequestreview-3686386229