message: [TF] Include group number in name of optimization_registry_dumps.
  This allows ordering of the optimization passes from different Groupings.
diff: @@ -42,18 +42,18 @@ Status OptimizationPassRegistry::RunGrouping(
  if (!s.ok()) return s;
  if (VLOG_IS_ON(1)) {
  if (options.graph) {
  - DumpGraphToFile(
  - strings::StrCat(
  - "after_phase_", phase.first, "_", pass->name(), "_",
  - reinterpret_cast<uintptr_t>((*options.graph).get())),
  + DumpGraphToFile(strings::StrCat("after_group_", grouping, "_phase_",
  + phase.first, "_", pass->name(), "_",
  + reinterpret_cast<uintptr_t>(
  + (*options.graph).get())),
  **options.graph, options.flib_def);
  }
  if (options.partition_graphs) {
  for (auto& part : *options.partition_graphs) {
  DumpGraphToFile(
  strings::StrCat(
  - "after_phase_", phase.first, "_", pass->name(),
  - "_partition_", part.first, "_",
  + "after_group_", grouping, "_phase_", phase.first, "_",
  + pass->name(), "_partition_", part.first, "_",
  reinterpret_cast<uintptr_t>(part.second.get())),
  *part.second, options.flib_def);
  }
  