message: don't let TARMU adding to RMU symbol file
  Summary: Note that always_emit_unreachable_symbols flag still let TARMU pass add to the file.
diff: @@ -25,6 +25,7 @@ const std::string UNREACHABLE_SYMBOLS_FILENAME =
  "redex-unreachable-removed-symbols.txt";
  const std::string REMOVED_SYMBOLS_REFERENCES_FILENAME =
  "redex-unreachable-removed-symbols-references.txt";
  +const std::string RMU_PASS_NAME = "RemoveUnreachablePass";
  void root_metrics(DexStoresVector& stores, PassManager& pm) {
  auto scope = build_class_scope(stores);
  @@ -189,8 +190,10 @@ void RemoveUnreachablePassBase::run_pass(DexStoresVector& stores,
  m_emit_graph_on_run &&
  static_cast<int64_t>(pm.get_current_pass_info()->repeat + 1) ==
  *m_emit_graph_on_run;
  - bool output_unreachable_symbols = m_always_emit_unreachable_symbols ||
  - pm.get_current_pass_info()->repeat == 0;
  + bool output_unreachable_symbols =
  + m_always_emit_unreachable_symbols ||
  + (pm.get_current_pass_info()->repeat == 0 &&
  + pm.get_current_pass_info()->pass->name() == RMU_PASS_NAME);
  TRACE(RMU, 2, "RMU: output unreachable symbols %d",
  output_unreachable_symbols);
  TRACE(RMU, 2, "RMU: remove_no_argument_constructors %d",
  