RFR: 8234446: Post-CMS workgroup hierarchy cleanup

Fri Apr 23 20:11:35 UTC 2021

Collapse workgroup hierarchy and some general cleanup.

Tested; hotspot_gc

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Commit messages:
 - rename GangWorker
 - AbstractGangWorker
 - WorkGang
 - cleanup

Changes: https://git.openjdk.java.net/jdk/pull/3663/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3663&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8234446
  Stats: 291 lines in 5 files changed: 86 ins; 165 del; 40 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3663.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3663/head:pull/3663

PR: https://git.openjdk.java.net/jdk/pull/3663