code: public Annotation addRuntimeInvisibleAnnotation(TypeDesc type) {
          AnnotationsAttr attr = null;
          for (int i = mAttributes.size(); --i >= 0; ) {
              Attribute a = mAttributes.get(i);
              if (a instanceof RuntimeInvisibleAnnotationsAttr) {
                  attr = (AnnotationsAttr) a;
              }
          }
          if (attr == null) {
              attr = new RuntimeInvisibleAnnotationsAttr(mCp);
              addAttribute(attr);
          }
          Annotation ann = new Annotation(mCp);
          ann.setType(type);
          attr.addAnnotation(ann);
          return ann;
      }
docs: Add a runtime invisible annotation.