[foreign-memaccess+abi] RFR: Fix visibility issues

[Per Minborg]

On Fri, 22 Sep 2023 13:29:40 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> Not super sure about this?

It appears difficult to contain the use of the classes that are changed to `public` as they are used from several packages. It might be possible but, I am not sure if it is worth the effort?

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PR Comment: https://git.openjdk.org/panama-foreign/pull/891#issuecomment-1733170718