I'd like to clean this up: Use the canonical layouts which are available in JDK22. Use try-with-resources for `Arena.ofConfined()`.
------------- Commit messages: - 8321300: Cleanup TestHFA Changes: https://git.openjdk.org/jdk/pull/16959/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16959&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8321300 Stats: 141 lines in 1 file changed: 1 ins; 10 del; 130 mod Patch: https://git.openjdk.org/jdk/pull/16959.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16959/head:pull/16959 PR: https://git.openjdk.org/jdk/pull/16959
