message: Remove post engine creation access to the graph
diff: @@ -347,20 +347,6 @@ StatusOr<std::unique_ptr<Executable>> PoplarCompiler::RunBackend(
  }
  }
  - const char *vertex_graph = getenv("TF_POPLAR_VERTEX_GRAPH_FILENAME");
  - if (vertex_graph != NULL) {
  - std::ofstream stream;
  - stream.open(vertex_graph);
  - graph->outputVertexGraph(stream, progs);
  - }
  -
  - const char *compute_graph = getenv("TF_POPLAR_COMPUTE_GRAPH_FILENAME");
  - if (compute_graph != NULL) {
  - std::ofstream stream;
  - stream.open(compute_graph);
  - graph->outputComputeGraph(stream, progs);
  - }
  -
  std::unique_ptr<HloProfileIndexMap> profile_index_map;
  std::unique_ptr<HloProfilePrinterData> profile_printer;
  if (module->config().hlo_profiling_enabled()) {
  