* typeck.c (comptypes, case TEMPLATE_TEMPLATE_PARM): Add parameter
	comparison.
	* pt.c (for_each_template_parm, case TEMPLATE_DECL): If it is a
	template template parameter, record its use.
	(for_each_template_parm, case TEMPLATE_TEMPLATE_PARM): Traverse
	its template arguments if exists.
	* pt.c (coerce_template_template_parms): New function equivalent
	to coerce_template_parms when IS_TMPL_PARM is true.
	(coerce_template_parms): Use it.  Remove the IS_TMPL_PARM parameter,
	all callers changed.
	(coerce_template_parms): Access ARGLIST properly when creating a
	new vector.  Only accept implicit TYPE_DECL as valid argument for
	a template template parameter when it is a base class of
	current_class_type.  Don't display error message when COMPLAIN is
	false.

From-SVN: r21073