Make class name references use the class_name production

Throw a compile error for "static" references instead, where it
isn't already the case.

Also extract the code that does

Make class name references use the class_name production

Throw a compile error for "static" references instead, where it
isn't already the case.

Also extract the code that does that -- we have quite a few places
where we get a const class ref and require it to be default.

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