[jdk17u-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 17.0.14-oracle.

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Commit messages:
 - Backport 2b4a4b7bd84806f997adc107abbd4351425e8d1d

Changes: https://git.openjdk.org/jdk17u-dev/pull/2896/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2896&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/jdk17u-dev/pull/2896.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2896/head:pull/2896

PR: https://git.openjdk.org/jdk17u-dev/pull/2896