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

[Jorn Vernee]

On Thu, 27 Jul 2023 17:46:55 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Move the FFM API out of preview, by removing preview feature annotations from the implementation, and adjusting the tests to no longer use `--enable-preview`

- I've updated the `@since` tags
- Updated the benchmarks, which I had forgotten before
- Searched the test directory for java.lang.foreign and updated all tests that used the API.

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PR Comment: https://git.openjdk.org/panama-foreign/pull/853#issuecomment-1654830867