[jdk21u-dev] RFR: 8326121: vmTestbase/gc/g1/unloading/tests/unloading_keepRef_rootClass_inMemoryCompilation_keep_cl failed with Full gc happened. Test was useless.

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 2b4a4b7bd84806f997adc107abbd4351425e8d1d

Changes: https://git.openjdk.org/jdk21u-dev/pull/991/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=991&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326121
  Stats: 8 lines in 2 files changed: 4 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/991.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/991/head:pull/991

PR: https://git.openjdk.org/jdk21u-dev/pull/991