c++: add fixed test [PR109095]

Fixed by r13-6693.

	PR c++/109095

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/nontype-class66.C: New test.

gcc/testsuite/g++.dg/cpp2a/nontype-class66.C

+// PR c++/109095
+// { dg-do compile { target c++20 } }
+
+template< typename T >
+struct bar
+{};
+
+template< int X >
+struct baz
+{};
+
+template< auto N, template< auto N2 > typename TT >
+struct foo;
+
+template< typename T, bar< T > B, template< T N2 > typename TT >
+struct foo< B, TT >
+{};
+
+foo< bar< int >{}, baz > x;