[jdk23u] RFR: 8333791: Fix memory barriers for @Stable fields

[Aleksey Shipilev]

On Wed, 25 Sep 2024 08:29:55 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Improves performance around `@Stable` uses, notably `new String`, `Enum.hashCode` and others.
> 
> Additional testing:
>  - [x] MacOS AArch64 server fastdebug, new IR tests pass
>  - [x] Linux x86_64 server fastdebug, `all`
>  - [x] Linux AArch64 server fastdebug, `all`

GHA failure looks environmental.

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PR Comment: https://git.openjdk.org/jdk23u/pull/122#issuecomment-2374671418