message: Do not print seed in MallocDebug
  Summary: Add a compile-time option to print, but do not print by default. MallocDebug is thread-local and redex spawns too many threads for this to not just be noise.
diff: @@ -99,12 +99,17 @@ size_t next_power_of_two(size_t x) {
  }
  namespace {
  +
  +constexpr bool PRINT_SEED = false;
  +
  class MallocDebug {
  public:
  explicit MallocDebug() : m_rand("wharblegarbl") {
  const char* seed_env = getenv("MALLOC_SEED");
  if (seed_env != nullptr) {
  + if (PRINT_SEED) {
  printf("re-seeding with %s\n", seed_env);
  + }
  m_rand.seed(seed_env);
  }
  }
  