I forgot to attach the patch.
Here it is.

On Sat, 2023-02-11 at 19:30 -0500, Antoni Boucher via Jit wrote:
> Hi.
> This patch adds support for machine-dependent builtins in libgccjit
> (bug 108762).
> 
> There are two things I don't like in this patch:
> 
>  1. There are a few functions copied from the C frontend
> (common_mark_addressable_vec and a few others).
> 
>  2. Getting a target builtin only works from the second compilation
> since the type information is recorded at the first compilation. I
> couldn't find a way to get the builtin data without using the
> langhook.
> It is necessary to get the type information for type checking and
> instrospection.
> 
> Any idea how to fix these issues?
> 
> Thanks for the review.