* pt.c (struct find_parameter_pack_data): Add
	type_pack_expansion_p field.
	(find_parameter_packs_r): Use it to turn 'auto' into a parameter pack.
	(uses_parameter_packs, make_pack_expansion)
	(check_for_bare_parameter_packs, fixed_parameter_pack_p): Set it.

From-SVN: r229722