[jdk17u-dev] RFR: 8319713: Parallel: Remove PSAdaptiveSizePolicy::should_full_GC

[Zhengyu Gu]

Backport this patch to jdk17u, as a prerequisite for clean backport of [JDK-8328744](https://bugs.openjdk.org/browse/JDK-8328744), which is a p2 bug.

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Commit messages:
 - Backport 4bcda602668835c35e2ac6ff6702d15cd249bc2a

Changes: https://git.openjdk.org/jdk17u-dev/pull/2450/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2450&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319713
  Stats: 24 lines in 3 files changed: 0 ins; 23 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2450.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2450/head:pull/2450

PR: https://git.openjdk.org/jdk17u-dev/pull/2450