[m-rev.] diff: break up mlds_to_c.m

[Zoltan Somogyi]

Its size was making maintenance of mlds_to_c.m harder than
it should be, hence this change. I plan to break up the mlds_to_{cs,java}.m
later as well.

This diff has no algorithmic changes, apart from inlining a couple
of predicates at their call sites, as a Gordian-knot-cutting answer
to the question of which new module they should be moved to.

Zoltan.
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