message: test: Add comment to g_insecure_rand_ctx
diff: @@ -26,6 +26,13 @@ std::ostream& operator<<(typename std::enable_if<std::is_enum<T>::value, std::os
  return stream << static_cast<typename std::underlying_type<T>::type>(e);
  }
  +/**
  + * This global and the helpers that use it are not thread-safe.
  + *
  + * If thread-safety is needed, the global could be made thread_local (given
  + * that thread_local is supported on all architectures we support) or a
  + * per-thread instance could be used in the multi-threaded test.
  + */
  extern FastRandomContext g_insecure_rand_ctx;
  static inline void SeedInsecureRand(bool deterministic = false)
  