[lworld] RFR: 8351569: [lworld] Revisit atomic access modes in flat var handles [v2]

[Maurizio Cimadamore]

On Fri, 21 Mar 2025 17:45:15 GMT, Chen Liang <liach at openjdk.org> wrote:

>> We have decided to address this by adding a primitive to create a flat array with given known layout:
>> https://github.com/openjdk/valhalla/pull/1404
>> 
>> Once that API is integrated, I will rebase this PR on top of that.
>
> That API is now in. This patch looks fine to me otherwise.

I've now simplified the code to use the new primitive.

-------------

PR Review Comment: https://git.openjdk.org/valhalla/pull/1402#discussion_r2008161109