c++: add testcase [PR97177]

Pr97177 is the local-var duplicate of pr97171.  So just adding the testcase.

	gcc/testsuite/
	* g++.dg/template/local-var1.C: New.

gcc/testsuite/g++.dg/template/local-var1.C

@@ -0,0 +1,20 @@
+// PR c++/97186, related to c++/97171 but with a variable
+// { dg-do compile { target c++11 } }
+
+namespace
+{
+  template <typename WF>
+  void
+  ml ()
+  {
+    extern WF cr;
+
+    static_assert (sizeof (cr) == 12, "");
+  }
+
+  void
+  qc ()
+  {
+    ml<int[3]> ();
+  }
+}