code: public MethodInfo addDefaultConstructor() {
          Modifiers modifiers = new Modifiers();
          modifiers.setPublic(true);
          MethodInfo mi = addConstructor(modifiers, null, null);
          CodeBuilder builder = new CodeBuilder(mi);
          builder.loadThis();
          builder.invokeSuperConstructor();
          builder.returnVoid();
          return mi;
      }
docs: Adds a public, no-arg constructor with the code buffer properly defined.