RFR: 7903933: Move sharable items from different generations to a common file [v4]

[Jorn Vernee]

On Thu, 27 Mar 2025 10:33:26 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> this means that there will always be at least two header classes generated foo_f and foo_h$0, where foo_h extends foo_h$0 and all the shared symbols are in foo_h$0.

Should we just give the base header a common name then, so that if you generate multiple times, you get sharing automatically? Maybe it could be named something like `Builtins`.

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PR Comment: https://git.openjdk.org/jextract/pull/278#issuecomment-2758351554