re PR c++/55127 (Incorrect "dependent scope" error with partial specialization of non-type parameter)

	PR c++/55127
	* search.c (accessible_in_template_p): New.
	* cp-tree.h: Declare it.
	* pt.c (instantiation_dependent_scope_ref_p): New.
	(value_dependent_expression_p): Use it.
	(instantiation_dependent_r): Likewise.
	* semantics.c (finish_decltype_type): Handle SCOPE_REF.

From-SVN: r194318