[m-rev.] diff: break up add_pragma and make_hlds_passes

[Zoltan Somogyi]

This breakup resolves several of the ZZZs in my recent change.

This diff just moves code around, so no review is needed, but just for information,
before this change, the sizes of those modules were, as reported by wc:

3847  12610 169514 add_pragma.m
3292  10973 134996 make_hlds_passes.m

and after it they are

1522   4915  66545 add_pragma.m
1356   4431  56966 make_hlds_passes.m

add_mutable_aux_preds.m is now bigger than make_hlds_passes.m,
the module it was carved out of.

Zoltan.
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