RFR: 7903933: Move sharable items from different generations to a common file [v6]

[Maurizio Cimadamore]

On Fri, 18 Apr 2025 15:35:08 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

>> Please review this patch to move the `C_*` layouts and the static utility methods into separate classes: `LayoutUtils.java` and `FFMUtils.java`, respectively.
>> 
>> - The names could later be personalized through a JSON configuration.
>> - We can use static imports if the `-t` option is no used and the files are generated into the default package, in that case we use the classname to call the static methods or use the `C_*` constants.
>> 
>> Some tests had to be modified slightly, either by adding new static imports or replacing classnames.
>
> Nizar Benalla has updated the pull request incrementally with one additional commit since the last revision:
> 
>   make utility classes final with a private constructor

The option for changing header class name is called `--header-class-name <name>`. So I'd suggest something like `--symbols-class-name`.

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PR Comment: https://git.openjdk.org/jextract/pull/278#issuecomment-2835721076