[m-rev.] for post-commit review: monomorphize some folds

[Zoltan Somogyi]

For review by anyone.

Next I will try specializing each variant by inlining their
foldlN_pred_with_status arguments. (These will be different
for different variants, hence the monomorphization.)
Once that is done, the variants can be given names that
reflect that action as well as the fold.

Zoltan.
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