RFR: 8338922: Parallel: Add task queue stats support in full GC [v2]

[Zhengyu Gu]

> Add capability to print out task queue stats in Parallel Compact GC, like other GCs.

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

  v1

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20694/files
  - new: https://git.openjdk.org/jdk/pull/20694/files/3e4592a2..b1a46198

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20694&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20694&range=00-01

  Stats: 6 lines in 3 files changed: 2 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20694.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20694/head:pull/20694

PR: https://git.openjdk.org/jdk/pull/20694