8334445: Parallel: Decouple maximum compaction from SoftReference clearing

[albertnetymk]

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

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Progress

• [x] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue

Issue

• JDK-8334445: Parallel: Decouple maximum compaction from SoftReference clearing (Enhancement - P4)

Reviewers

• Zhengyu Gu (@zhengyu123 - Reviewer)

Reviewing

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$ git checkout pull/19763

Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk.git pull/19763/head

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