message: Cleaning up an old comment about GPU memory scheduler.
diff: @@ -197,10 +197,8 @@ StatusOr<std::unique_ptr<GpuHloSchedule>> GpuHloSchedule::Build(
  // Initialize thunk_launch_order_, the total order of thunk launches.
  HloComputation* entry_computation = module->entry_computation();
  if (stream_assignment.StreamCount() == 1) {
  - // Use `DFSMemoryScheduler` to be consistent with previous / CPU backend
  - // behavior.
  - // TODO(timshen): Using the default schedule seems to cause tests to fail.
  - // The exact reason unknown. Investigate it.
  + // All kernels are launched on a single stream, so there's no loss of
  + // concurrency by optimizing for minimal memory usage.
  TF_ASSIGN_OR_RETURN(
  HloSchedule sequences,
  ScheduleModule(
  