re PR c++/60065 ([c++1y] ICE with auto parameter pack)

re PR c++/60065 ([c++1y] ICE with auto parameter pack)

Fix PR c++/60065.

	PR c++/60065
	* parser.c (cp_parser_direct_declarator): Don't save and
	restore num_template_parameter_lists around call to
	cp_parser_parameter_declaration_list.
	(function_being_declared_is_template_p): New predicate.
	(cp_parser_parameter_declaration_list): Use
	function_being_declared_is_template_p as predicate for
	inspecting current function template parameter list length
	rather than num_template_parameter_lists.

	PR c++/60065
	* g++.dg/cpp1y/pr60065.C: New testcase.

From-SVN: r208106