- Fixed regression whereby the "annotation" system used by the ORM was leaking

- Fixed regression whereby the "annotation" system used by the ORM was leaking
into the names used by standard functions in :mod:`sqlalchemy.sql.functions`,
such as ``func.coalesce()`` and ``func.max()``.  Using these functions
in ORM attributes and thus producing annotated versions of them could
corrupt the actual function name rendered in the SQL. [ticket:2927]