PR c++/70634

	* pt.c (instantiation_dependent_uneval_expression_p): Split out
	from instantiation_dependent_expression_p.
	(value_dependent_expression_p): Use it for unevaluated operands.
	(instantiation_dependent_r): Don't check value-dependence.
	(instantiation_dependent_expression_p): Check
	value-dependence of the expression as a whole.
	* cp-tree.h: Declare instantiation_dependent_uneval_expression_p.
	* semantics.c (finish_decltype_type): Use it.

From-SVN: r234945