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

[Ivan Walulya]

> 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

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29249/files
  - new: https://git.openjdk.org/jdk/pull/29249/files/2f082613..0f3df5f7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29249&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29249&range=02-03

  Stats: 7 lines in 3 files changed: 2 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/29249.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29249/head:pull/29249

PR: https://git.openjdk.org/jdk/pull/29249