RFR: 7903923: Derive C_* layouts directly from the Linker [v3]

[Maurizio Cimadamore]

On Mon, 13 Jan 2025 12:21:37 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> What's the story with primitive typedef? Do they work? I believe they will go back to stuff like JAVA_INT and such, instead of picking the layout constant we have already emitted. E.g.
> 
> `typedef int myInt`

I think to address this, the method ClassSourceBuilder::primitiveLayoutString might come in useful, as we use that method to generate references to primitive layouts e.g. inside struct layout declarations.

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PR Comment: https://git.openjdk.org/jextract/pull/269#issuecomment-2586967055