re PR c++/13262 ("xxx is private within this context" when initializing a *self-contained* template class)

	PR c++/13262
	* pt.c (instantiate_decl): Wrap push_nested_class and
	pop_nested_class around cp_finish_decl call for static member
	variable.

	* g++.dg/template/access13.C: New test.

From-SVN: r74780