pt.c (convert_nontype_argument): Move check for is_overloaded_fn early to avoid bogus...

pt.c (convert_nontype_argument): Move check for is_overloaded_fn early to avoid bogus error.

	* pt.c (convert_nontype_argument): Move check for is_overloaded_fn
	early to avoid bogus error.  Handle overloaded function
	names provided as template arguments correctly.
	(coerce_template_parms): Don't mishandle overloaded functions when
	dealing with template template parameters.
	(lookup_template_class): Issue an error message, rather than
	crashing, when the TYPE_DECL provided is not a template type.

From-SVN: r17552