message: Remove unused variable from HloComputation::MakeInstructionPostOrder
diff: @@ -357,7 +357,6 @@ std::list<HloInstruction*> HloComputation::MakeInstructionPostOrder() const {
  std::list<HloInstruction*> post_order;
  std::list<HloInstruction*> trace_instructions;
  tensorflow::gtl::FlatSet<HloInstruction*> added_instructions;
  - std::vector<HloInstruction> dfs_stack;
  for (auto& instruction : instructions_) {
  if (instruction->opcode() == HloOpcode::kTrace) {
  // Trace instructions aren't handled by the DFS visitor. Add trace
  