RFR: 8343704: Bad GC parallelism with processing Cleaner queues [v17]

[Aleksey Shipilev]

> See the bug for more discussion and reproducer. This PR replaces the ad-hoc linked list with segmented list of arrays. Arrays are easy targets for GC. There are possible improvements here, most glaring is parallelism that is currently knee-capped by global synchronization. The synchronization scheme follows what we have in original code, and I think it is safer to continue with it right now.
> 
> I'll put performance data in a separate comment.
> 
> Additional testing:
>  - [x] Original reproducer improves drastically
>  - [x] New microbenchmark shows no regression on "churning" tests, which covers insertion/removal perf
>  - [x] New microbenchmark shows improvement on Full GC times (crude, but repeatable), serves as a proxy for reproducer
>  - [x] `java/lang/ref` tests in release 
>  - [x] `all` tests in fastdebug

Aleksey Shipilev 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 19 additional commits since the last revision:

 - Merge branch 'master' into JDK-8343704-cleaner-gc
 - Locals for head.size
 - Merge branch 'master' into JDK-8343704-cleaner-gc
 - Improve CleanerGC benchmark
 - Check all elements are removable after random test
 - Use RandomFactory in test
 - Touchups
 - Merge branch 'master' into JDK-8343704-cleaner-gc
 - Drop --add-exports from the test
 - prev is not needed
 - ... and 9 more: https://git.openjdk.org/jdk/compare/3ebe2206...39184f94

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22043/files
  - new: https://git.openjdk.org/jdk/pull/22043/files/a3cffd25..39184f94

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=16
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=15-16

  Stats: 114568 lines in 1582 files changed: 81503 ins; 25172 del; 7893 mod
  Patch: https://git.openjdk.org/jdk/pull/22043.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22043/head:pull/22043

PR: https://git.openjdk.org/jdk/pull/22043