re PR c++/10956 (ICE when specializing a template member function of a template class, in tsubst, at cp/pt.c:6459)

	PR c++/10956
	* pt.c (instantiate_decl): Don't use full template arguments if
	we are dealing with specializations.

	* g++.dg/template/spec9.C: New test.

From-SVN: r67268