* error.c (dump_decl): Fix type of default arguments for template
	template parameters and nontype template parameters.
	* parse.y (template_parm): Handle invalid default template
	template arguments here.
	* parse.y (template_parm): Use template_arg instead of PTYPENAME
	for default template template argument.
	* pt.c (coerce_template_parms): Merge default template argument
	codes.  Can treat RECORD_TYPE as template name if it is implicitly
	created.  Fix argument index in error message.
	* typeck.c (comptypes): Merge template argument comparison codes in
	TEMPLATE_TEMPLATE_PARM and RECORD_TYPE.

From-SVN: r17650