message: Do not prune unreachable functions in FunctionalizeControlFlowPass.
diff: @@ -274,12 +274,16 @@ Status FunctionalizeControlFlowPass::Run(
  n->ClearAttr(func_attr);
  func.set_name(new_func_name);
  n->AddAttr(func_attr, func);
  -
  fld_modified = true;
  }
  }
  - if (fld_modified) {
  + // TODO(ylc, endlessroad): Change this to "if (fld_modified")"
  + if (false) {
  + if (VLOG_IS_ON(4)) {
  + DumpGraphToFile("functionalize_control_flow_before_prune", *graph,
  + options.flib_def);
  + }
  TF_RETURN_IF_ERROR(
  PruneUnreachableFunctionsFromGraph(*graph, options.flib_def));
  }
  