[m-rev.] for post-commit review: make linking code more readable

[Zoltan Somogyi]

For review by anyone. I am seeking ideas for better names
for the two main predicates affected by this diff in compile_target_code.m.

I also noticed an annoying if minor inconsistency. Many predicates in the
updated modules take both ProgressStream and Globals as arguments, but
some take them in one order, and some take them in the other. Both are
justifiable, but consistency would better. Any preferences?

Zoltan.
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