message: actually making concurrent operations thread-safe
diff: @@ -223,7 +223,7 @@ AnnoKill::AnnoSet AnnoKill::get_referenced_annos() {
  }
  });
  - AnnoKill::AnnoSet concurrent_referenced_annos;
  + ConcurrentSet<DexType*> concurrent_referenced_annos;
  auto add_concurrent_referenced_anno = [&](DexType* t) {
  if (!referenced_annos.count(t)) {
  concurrent_referenced_annos.insert(t);
  