Add GetClassNode specializations for functions and builtin class

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/object/GetClassNode.java

@@ -51,7 +51,10 @@
 import com.oracle.graal.python.builtins.objects.cext.PythonNativeVoidPtr;
 import com.oracle.graal.python.builtins.objects.cext.capi.CExtNodes;
 import com.oracle.graal.python.builtins.objects.ellipsis.PEllipsis;
+import com.oracle.graal.python.builtins.objects.function.PBuiltinFunction;
+import com.oracle.graal.python.builtins.objects.function.PFunction;
 import com.oracle.graal.python.builtins.objects.object.PythonObject;
+import com.oracle.graal.python.builtins.objects.type.PythonBuiltinClass;
 import com.oracle.graal.python.nodes.PGuards;
 import com.oracle.graal.python.nodes.PNodeWithContext;
 import com.oracle.graal.python.nodes.truffle.PythonTypes;
@@ -121,6 +124,21 @@ static Object getNone(@SuppressWarnings("unused") PNone object) {
         return PythonBuiltinClassType.PNone;
     }
 
+    @Specialization
+    static Object getBuiltinClass(@SuppressWarnings("unused") PythonBuiltinClass object) {
+        return PythonBuiltinClassType.PythonClass;
+    }
+
+    @Specialization
+    static Object getFunction(@SuppressWarnings("unused") PFunction object) {
+        return PythonBuiltinClassType.PFunction;
+    }
+
+    @Specialization
+    static Object getBuiltinFunction(@SuppressWarnings("unused") PBuiltinFunction object) {
+        return PythonBuiltinClassType.PBuiltinFunction;
+    }
+
     @Specialization(guards = {"klass != null", "object.getShape() == cachedShape", "hasInitialClass(cachedShape)"}, limit = "1", assumptions = "singleContextAssumption()")
     static Object getPythonObjectConstantClass(@SuppressWarnings("unused") PythonObject object,
                     @SuppressWarnings("unused") @Cached("object.getShape()") Shape cachedShape,