RFR: 8374984: Convert workerUtils to use Atomic<T> [v2]

[Kim Barrett]

> Please review this change to make SubTasksDone and SequentialSubTasksDone use
> Atomic<T> instead of AtomicAccess.
> 
> Testing: mach5 tier1

Kim Barrett 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 three additional commits since the last revision:

 - Merge branch 'master' into worker-utils-atomic
 - use compare_set
 - worker utils

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29201/files
  - new: https://git.openjdk.org/jdk/pull/29201/files/741013a1..83bbe806

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29201&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29201&range=00-01

  Stats: 17728 lines in 184 files changed: 9716 ins; 4258 del; 3754 mod
  Patch: https://git.openjdk.org/jdk/pull/29201.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29201/head:pull/29201

PR: https://git.openjdk.org/jdk/pull/29201