The implementation of MemorySessionImpl::isAccessibleBy is incorrect, and ends up always returning `false` for scopes associated with shared arenas. This patch rectifies that, and adds some tests.
------------- Commit messages: - Fix bug in MemorySessionImpl::isAccessibleBy Changes: https://git.openjdk.org/jdk20/pull/110/files Webrev: https://webrevs.openjdk.org/?repo=jdk20&pr=110&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8300275 Stats: 24 lines in 2 files changed: 19 ins; 2 del; 3 mod Patch: https://git.openjdk.org/jdk20/pull/110.diff Fetch: git fetch https://git.openjdk.org/jdk20 pull/110/head:pull/110 PR: https://git.openjdk.org/jdk20/pull/110
