Implement JEP 502. The PR passes tier1-tier3 tests.
------------- Commit messages: - Use acquire semantics for reading rather than volatile semantics - Add missing null check - Simplify handling of sentinel, wrap, and unwrap - Fix JavaDoc issues - Fix members in StableEnumFunction - Address some comments in the PR - Merge branch 'master' into implement-jep502 - Revert change - Fix copyright issues - Update JEP number - ... and 231 more: https://git.openjdk.org/jdk/compare/4cf63160...09ca44e6 Changes: https://git.openjdk.org/jdk/pull/23972/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8351565 Stats: 3980 lines in 30 files changed: 3949 ins; 18 del; 13 mod Patch: https://git.openjdk.org/jdk/pull/23972.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/23972/head:pull/23972 PR: https://git.openjdk.org/jdk/pull/23972
