[m-rev.] diff: avoid redundant declaration code

[Julien Fischer]

On Fri, 14 Oct 2005, Zoltan Somogyi wrote:

> compiler/llds_out.m:
> 	Don't print out any given piece of foreign declaration code more than
> 	once. With intermodule inlining, the redundant foreign_import_modules
> 	the front end generates lead to the .mh files of library modules being
> 	printed literally dozens of times.
>
> 	It would be nice to avoid redundant foreign_import_modules in the first
> 	place, but that is harder to do.
>
I'll take a look at doing that, since it would also reduce the size of
the .opt files.

Cheers,
Julien.
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