message: Do not call Allocator.CheckRedzones() if redzone checking is disabled.
  This is a performance optimization: with RZ checking disabled, the CheckRedzones() will not perform any actual checking.
diff: @@ -57,6 +57,9 @@ se::DeviceMemoryBase WrapRedzoneBestEffort(se::RedzoneAllocator* rz_allocator,
  void CheckRedzones(const se::RedzoneAllocator& rz_allocator,
  tensorflow::AutotuneResult* autotune_result) {
  + if (RedzoneCheckDisabled()) {
  + return;
  + }
  se::port::StatusOr<se::RedzoneAllocator::RedzoneCheckStatus> rz_status =
  rz_allocator.CheckRedzones();
  if (!rz_status.ok()) {
  