Fix Trac #8485.

The problem was that the renamer treated role annotations by looking
up the annotated type in the module being compiled. If this check
succeeded, it was assumed that the annotated type was being compiled
at the same time. But this assumption is false! In GHCi (and Template
Haskell), sometimes compilation within one module can be staged. So,
now there is a more intricate check for orphan role annotations. This
also has the benefit of producing better error messages.