GoLang:fix overload functions with polymorphic issue

Examples/test-suite/overload_polymorphic.i

@@ -0,0 +1,25 @@
+%module overload_polymorphic
+
+#ifndef SWIG_NO_OVERLOAD
+
+%inline %{
+
+class Base {
+public:
+	Base(){}
+	virtual ~Base(){}
+};
+
+class Derived : public Base {
+public:
+	Derived(){}
+	virtual ~Derived(){}
+};
+
+
+
+int test(Base* base){ return 0;}
+int test(int hello){ return 1; }
+
+%}
+#endif