RFR: 8333791: Fix memory barriers for @Stable fields

[Paul Sandoz]

On Tue, 16 Jul 2024 09:53:55 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > IIUC this means we can remove the explicit fence here:
> > ```
> >     public ConstantCallSite(MethodHandle target) {
> >         super(target);
> >         isFrozen = true;
> >         UNSAFE.storeStoreFence(); // properly publish isFrozen update
> >     }
> > ```
> 
> I think so, but there is more to it: there are other fences around the `CallSite`-s that might be related to this. I would prefer not to do it any of usage changes in this PR. 

Agreed, just wanted to test my understanding.

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PR Comment: https://git.openjdk.org/jdk/pull/19635#issuecomment-2231262373