RFR: 8339668: Parallel: Adopt PartialArrayState to consolidate marking stack in Full GC [v3]

[Zhengyu Gu]

> Please review this patch that adopts `PartialArrayState`introduced by [JDK-8337709](https://bugs.openjdk.org/browse/JDK-8337709) to consolidate `_oop_task_queues` and `_objarray_task_queues` into single `_marking_stacks`.
> 
> The change mirrors Kim's [JDK-8311163](https://bugs.openjdk.org/browse/JDK-8311163) work, therefore, there are methods can be consolidated and simplified, but I would like defer to a followup CR.

Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:

  @tschatzl's ScannerTask changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21089/files
  - new: https://git.openjdk.org/jdk/pull/21089/files/15b998f6..fd756b3b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21089&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21089&range=01-02

  Stats: 55 lines in 5 files changed: 8 ins; 33 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/21089.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21089/head:pull/21089

PR: https://git.openjdk.org/jdk/pull/21089