[jdk22u] RFR: 8272364: Parallel GC adaptive size policy may shrink the heap below MinHeapSize

[Zhengyu Gu]

The backport is not clean. 

The conflict is in the new test, which uses new API introduced by JDK-8321812 in 23. The issue is resolved by fall back to use old API in 22.

This risk of the backport is low and shrinking heap below minimum heap size is an unpleasant surpprise.

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Commit messages:
 - cleanup
 - Backport 6bef0474c8b8773d0d20c0f25c36a2ce9cdbd7e8

Changes: https://git.openjdk.org/jdk22u/pull/217/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=217&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8272364
  Stats: 101 lines in 2 files changed: 101 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk22u/pull/217.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/217/head:pull/217

PR: https://git.openjdk.org/jdk22u/pull/217