[jdk23u] RFR: 8346713: [testsuite] NeverActAsServerClassMachine breaks TestPLABAdaptToMinTLABSize.java TestPinnedHumongousFragmentation.java TestPinnedObjectContents.java

[Jan Kratochvil]

A clean backport.

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Commit messages:
 - 8346713: [testsuite] NeverActAsServerClassMachine breaks TestPLABAdaptToMinTLABSize.java TestPinnedHumongousFragmentation.java TestPinnedObjectContents.java

Changes: https://git.openjdk.org/jdk23u/pull/232/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=232&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346713
  Stats: 22 lines in 3 files changed: 14 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk23u/pull/232.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/232/head:pull/232

PR: https://git.openjdk.org/jdk23u/pull/232