Fixes in the logic to determine if a value class is naturally atomic or not. The previous implementation incorrectly considered values classes with a single non-empty nullable field as being naturally atomic. Also includes improvements to the InstanceKlass::is_naturally_atomic() to prevent bad usages.
Tested locally. More testing in progress on Mach5 (tiers 1-4). --------- - [X] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Fixed from StefanK feedback - Fix naturally atomic policy Changes: https://git.openjdk.org/valhalla/pull/2361/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2361&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8382941 Stats: 66 lines in 6 files changed: 58 ins; 0 del; 8 mod Patch: https://git.openjdk.org/valhalla/pull/2361.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2361/head:pull/2361 PR: https://git.openjdk.org/valhalla/pull/2361
