[jdk21u-dev] RFR: 8304292: Memory leak related to ClassLoader::update_class_path_entry_list

[Goetz Lindenmaier]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport 88b4e3b8539c2beb29ad92bd74b300002c2ef84b

Changes: https://git.openjdk.org/jdk21u-dev/pull/97/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=97&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304292
  Stats: 75 lines in 5 files changed: 63 ins; 5 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/97.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/97/head:pull/97

PR: https://git.openjdk.org/jdk21u-dev/pull/97