swift234

Omit bodies from module-scope decls in pretty-printed synthetic sources.

Since we only print a single line, there's no point in including the
open-brace at the end. Moreover, modules are /supposed/ to be opaque.
The user shouldn't be thinking about how any adapter functions work,
either.

On the other hand, if we're looking at a non-top-level decl, we want to
see it as if it were in context, so in that case we can be more "source-y".

Swift SVN r6919