[foreign-memaccess+abi] RFR: 8313265: Move the FFM API out of preview

[Jorn Vernee]

On Thu, 27 Jul 2023 22:47:08 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Ok, I'll try to get confirmation on that, and then adjust the `@since` tags as needed.
>
> It seems that, at least this was also done in the case of Loom: https://github.com/openjdk/jdk/pull/13203/files#diff-2a5b4b651fa41e70f7953f7ee06e964d8396fcd1fe5755a1609e81b3f84d9224R842

I asked, and Joe confirms that we need to update the `@since` tags. This is also mentioned in [JEP12](https://bugs.openjdk.org/browse/JDK-8195734): 

> The author of a preview API element must also provide an `@since` tag in the element's javadoc comment, indicating the release when `@preview` was first added. If the API element is eventually made final and permanent in Java SE $N, then the `@since` tag must be changed to indicate release $N, as the element's history prior to $N is not of long-term interest.

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PR Review Comment: https://git.openjdk.org/panama-foreign/pull/853#discussion_r1276976558