parser.c (cp_parser_constant_expression): Set non_integral_constant_expression correctly for C++0x too.

	* parser.c (cp_parser_constant_expression): Set
	non_integral_constant_expression correctly for C++0x too.
	(cp_parser_static_assert): Allow non-constant expression.
	(cp_parser_direct_declarator): Expect non_constant_p to be set
	properly for C++0x.
	* pt.c (value_dependent_expression_p): Handle TYPEID_EXPR.
	* semantics.c (maybe_constant_value): Check type_unknown_p too.
	(potential_rvalue_constant_expression): New.
	(require_potential_rvalue_constant_expression): New.

From-SVN: r170488