[m-rev.] for post-commit review: construct initial module_and_imports directly

[Zoltan Somogyi]

For post-commit review by anyone.

I would like everyone to try out the updated compiler on their Mercury
code bases, and report the results: were the sanity checks added
by this diff triggered, or not? If and when everyone reports things
are ok, I intend to switch over to using the new code exclusively.

Zoltan.
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