[m-rev.] for review: module_dep_summary

[Julien Fischer]

On Thu, 29 Jul 2021, Zoltan Somogyi wrote:

> Create and use module_dep_summary.

...

> compiler/compile_target_code.m:
>     Expect a module_dep_info instead of a module_and_imports,
>     since that is what our callers have.
>
>     Add an XXX for a surprising piece of code.

The code referred to by that XXX is almost definitely a mistake; it should
only be considering the FIMs for C#.

The diff is fine.

Julien.