[jdk17u-dev] RFR: 8309241: ClassForNameLeak fails intermittently as the class loader hasn't been unloaded

[Andrew Lu]

I backport this for parity with 17.0.13-oracle.

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Commit messages:
 - Backport a23bbea9593a85a9d60431e68805efa6f960a4d4

Changes: https://git.openjdk.org/jdk17u-dev/pull/2650/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2650&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309241
  Stats: 58 lines in 1 file changed: 15 ins; 29 del; 14 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2650.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2650/head:pull/2650

PR: https://git.openjdk.org/jdk17u-dev/pull/2650