Convert `ClassForNameLeak` test to use `jdk.test.lib.util.ForceGC` that would be more reliable in waiting for the class loader to be unloaded.
------------- Commit messages: - 8309241: ClassForNameLeak fails intermittently as the class loader hasn't been unloaded Changes: https://git.openjdk.org/jdk/pull/14269/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14269&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/jdk/pull/14269.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14269/head:pull/14269 PR: https://git.openjdk.org/jdk/pull/14269
