[foreign-memaccess+abi] RFR: Change classes into records and fix finality

[Jorn Vernee]

On Mon, 19 Sep 2022 12:33:23 GMT, Per Minborg <duke at openjdk.org> wrote:

> This PR converts some of the regular classes into records. It also fixes some finality issues.
> 
> Note: Some methods with a very long method parameter list have their parameter list broken up into separate lines.

I'd also like to hear your motivation for doing the finality changes. This is not an obvious "fix" to me, but seems like a rather superfluous change (especially for internal classes).

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PR: https://git.openjdk.org/panama-foreign/pull/725