[m-rev.] for post-commit review: simplify printing class decls

[Zoltan Somogyi]

For review by anyone.

Next, I intend to take the code for printing the kinds
of class decls that we used get with hl grades (which we
deleted in april 2020) but which we don't get with
hlc grades, and replace them with calls to unexpected,
leaving the old code as comments and/or as dead
predicates with consider_used pragmas.
If you object to this, please speak up.

Zoltan.
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