RFR: 8334445: Parallel: Decouple maximum compaction from SoftReference clearing [v3]

[Albert Mingkun Yang]

> Simple refactoring to not assume maximum-compaction from soft-ref-clearing.

Albert Mingkun Yang 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 pgc-max-compact
 - Merge branch 'master' into pgc-max-compact
 - pgc-max-compact

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19763/files
  - new: https://git.openjdk.org/jdk/pull/19763/files/ce280652..1a8be092

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19763&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19763&range=01-02

  Stats: 5003 lines in 146 files changed: 4030 ins; 586 del; 387 mod
  Patch: https://git.openjdk.org/jdk/pull/19763.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19763/head:pull/19763

PR: https://git.openjdk.org/jdk/pull/19763