The identity hash code of value objects currently can produce 0. A zero value is usually not anticipated for System.identityHashCode calls unless the argument is null; the 0 hash also cannot be cached. Thus, we should move away from the 0 hash.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Merge branch 'feature/value-hash-zero' of github.com:liachmodded/jdk into feature/value-hash-zero - Compiler part - Merge branch 'master' of github.com:openjdk/jdk into feature/value-hash-zero - Use class identity hash code - Merge branch 'master' of github.com:openjdk/jdk into feature/value-hash-zero - Mask zero value object hash Changes: https://git.openjdk.org/jdk/pull/32660/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=32660&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8391990 Stats: 112 lines in 4 files changed: 104 ins; 0 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/32660.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/32660/head:pull/32660 PR: https://git.openjdk.org/jdk/pull/32660
