[lworld] RFR: [lworld][lw3] 8267710: Hook AlwaysAtomicAccesses to primitive classes atomicity rules

[Aleksey Shipilev]

On Tue, 25 May 2021 17:27:44 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> `AlwaysAtomicAccesses` was added in JDK 9 to aid the research in the costs of requiring the always-atomic accesses. It would be nice to hook it up to current Valhalla code that handles explicitly declared atomic primitive classes.
> 
> Testing:
>  - [x] ad-hoc jcstress tests with lworld and `-XX:(-|+)AlwaysAtomicAccesses`

OK, added, renamed, ran `runtime/valhalla` without problems.

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PR: https://git.openjdk.java.net/valhalla/pull/427