Hi, This PR implements the support of `NULLABLE_NON_ATOMIC_FLAT` layout in the JITs. There is nothing to do in C2. In C1, I need to implement loading/storing nullable value of a non-atomic field.
The test `TestValueClasses` is failing with `-XX:-TieredCompilation`, which I suspect is due to the sustitutability test handling padding bytes incorrectly. Please kindly review what there are for now, thanks a lot. ------------- Commit messages: - Support NULLABLE_NON_ATOMIC in the JITs Changes: https://git.openjdk.org/valhalla/pull/1970/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1970&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8376135 Stats: 151 lines in 11 files changed: 83 ins; 22 del; 46 mod Patch: https://git.openjdk.org/valhalla/pull/1970.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1970/head:pull/1970 PR: https://git.openjdk.org/valhalla/pull/1970
