message: [XLA] Use `MakeNonfusionComputations` in ParallelTaskAssignment.
  No functional change, minor cleanup.
diff: @@ -238,10 +238,7 @@ void ParallelTaskAssigner::ComputeTargetParallelTasks(
  &target_machine_features_);
  // Compute parallel task counts for all instructions in 'module'.
  - for (auto* computation : module->computations()) {
  - if (computation->IsFusionComputation()) {
  - continue;
  - }
  + for (auto* computation : module->MakeNonfusionComputations()) {
  for (auto* instruction : computation->instructions()) {
  // Query ParallelTaskAssignment for target parallel task count.
  const int64 target_parallel_task_count =
  