RFR: 8280397: Factor out task queue statistics printing [v3]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this change that makes task queue (set) printing available in a central place so that not every user needs to reinvent the wheel?
> As example I wired up existing G1/Parallel GC young collection statistics printing, but I intend to add this for full gcs too; since ZGC and Shenandoah do not print task queues at all I do not intend to do that at least initially.
> Currently the main printing method is in `CollectedHeap`, but I can move it elsewhere if needed (all but Serial GC do use task queue sets though, so.....).
> 
> Testing: gha (building), local testing
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - Merge branch 'master' into 8280397-central-taskqueue-printing
 - kbarrett review, copyright dates
 - pliden review
 - Initial implementation using CollectedHeap

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Changes: https://git.openjdk.java.net/jdk/pull/7174/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7174&range=02
  Stats: 136 lines in 5 files changed: 61 ins; 64 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7174.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7174/head:pull/7174

PR: https://git.openjdk.java.net/jdk/pull/7174