re PR c++/48948 ([C++0x] constexpr friend function cannot be defined in-class)

re PR c++/48948 ([C++0x] constexpr friend function cannot be defined in-class)

	PR c++/48948
	PR c++/49015
	* class.c (finalize_literal_type_property): Do check
	for constexpr member functions of non-literal class.
	(finish_struct): Don't call check_deferred_constexpr_decls.
	* cp-tree.h: Don't declare it.
	(DECL_DEFERRED_CONSTEXPR_CHECK): Remove.
	* decl.c (grok_special_member_properties): Don't check it
	(grokfnedcl): Don't call validate_constexpr_fundecl.
	(start_preparsed_function): Do call it.
	* pt.c (tsubst_decl): Don't call it.
	(instantiate_class_template_1): Don't call
	check_deferred_constexpr_decls.
	* semantics.c (literal_type_p): Check for any incompleteness.
	(ensure_literal_type_for_constexpr_object): Likewise.
	(is_valid_constexpr_fn): Revert deferral changes.
	(validate_constexpr_fundecl): Likewise.
	(register_constexpr_fundef): Likewise.
	(check_deferred_constexpr_decls): Remove.

From-SVN: r173869