Python: Modernise the py/not-named-cls query.

python/ql/src/Functions/NonCls.ql

@@ -23,13 +23,13 @@ predicate first_arg_cls(Function f) {
 }
 
 predicate is_type_method(Function f) {
-    exists(ClassObject c | c.getPyClass() = f.getScope() and c.getASuperType() = theTypeType())
+    exists(ClassValue c | c.getScope() = f.getScope() and c.getASuperType() = ClassValue::type())
 }
 
 predicate classmethod_decorators_only(Function f) {
     forall(Expr decorator |
         decorator = f.getADecorator() |
-            ((Name) decorator).getId() = "classmethod")
+            decorator.(Name).getId() = "classmethod")
 }
 
 from Function f, string message

python/ql/src/semmle/python/objects/ObjectAPI.qll

@@ -560,6 +560,11 @@ module ClassValue {
         result = TBuiltinClassObject(Builtin::special("FunctionType"))
     }
 
+    /** Get the `ClassValue` for the `type` class. */
+    ClassValue type() {
+        result = TType()
+    }
+
     /** Get the `ClassValue` for the class of builtin functions. */
     ClassValue builtinFunction() {
         result = Value::named("len").getClass()