static String toString(AnnotationMirror annotationMirror) {
    StringBuilder sb = new StringBuilder();
    new SourceFormVisitor().visitAnnotation(annotationMirror, sb);
    return sb.toString();
  }
Returns a string representation of the given annotation mirror, suitable for inclusion in a
Java source file to reproduce the annotation in source form.
common/src/main/java/com/google/auto/common/AnnotationOutput.java