RFR: 8339668: Parallel: Adopt PartialArrayState to consolidate marking stack in Full GC [v4]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 15 additional commits since the last revision:

 - Adopt latest PartialArrayStats changes
 - Merge branch 'master' into JDK-8339668
 - Merge branch 'master' into JDK-8339668
 - @tschatzl's ScannerTask changes
 - @tschatzl's comment
 - v8
 - v7
 - v6
 - v5
 - v4
 - ... and 5 more: https://git.openjdk.org/jdk/compare/37e5a031...0ed1a358

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21089/files
  - new: https://git.openjdk.org/jdk/pull/21089/files/fd756b3b..0ed1a358

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21089&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21089&range=02-03

  Stats: 832172 lines in 10732 files changed: 537899 ins; 230171 del; 64102 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