[jdk21u-dev] RFR: 8321299: runtime/logging/ClassLoadUnloadTest.java doesn't reliably trigger class unloading

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 5cae7d20adf9828e05d3cd2823c6b95ee1ab6db4

Changes: https://git.openjdk.org/jdk21u-dev/pull/1045/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1045&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321299
  Stats: 6 lines in 1 file changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1045.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1045/head:pull/1045

PR: https://git.openjdk.org/jdk21u-dev/pull/1045