[GR-10277] Instances of an extended class from int doesn't have right type.

Author: ppisl

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinConstructors.java

@@ -710,7 +710,7 @@ public Object createInt(PythonClass cls, PythonObject obj, PNone keywordArg,
                     return createInt(cls, (long) result, keywordArg, isIntProfile);
                 } else if (result instanceof PInt) {
                     // TODO warn if 'result' not of exact Python type 'int'
-                    return result;
+                    return isPrimitiveInt(cls) ? result : factory().createInt(cls, ((PInt) result).getValue());
                 } else {
                     throw raise(TypeError, "__int__ returned non-int (type %p)", result);
                 }