PR c++/27689
	* cp-tree.h (CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P): New
	macro.
	* pt.c (unify): Use it.
	PR c++/27689
	* g++.dg/template/ttp18.C: New test.
	* g++.dg/template/ttp19.C: Likewise.

From-SVN: r114703