message: make kMeshPeriodDefaultSecs constexpr
diff: @@ -69,7 +69,7 @@ static constexpr bool kEnableShuffleOnInit = kEnableShuffleOnFree;
  // madvise(DONTDUMP) the heap to make reasonable coredumps
  static constexpr bool kAdviseDump = false;
  -static const double kMeshPeriodSecs = .1;
  +static constexpr double kMeshPeriodSecs = .1;
  // controls aspects of miniheaps
  static constexpr size_t kMaxMeshes = 4;
  