message: Add missing .txt extension
  Summary: Add missing '.txt'
  Reviewers: #tensorflow, georgep, anthonyb
  Subscribers: anthonyb, georgep
diff: @@ -227,9 +227,9 @@ void DumpIfPoplarOutOfMemoryAllocationException(
  SetFlagIfNotPresent(opts, "showVarStorage", "true");
  // Always produce a text report
  - std::ofstream stream(dump_filename);
  + std::ofstream stream(dump_filename + ".txt");
  if (!stream) {
  - LOG(WARNING) << "Unable to open file " << dump_filename
  + LOG(WARNING) << "Unable to open file " << dump_filename << ".txt"
  << ", the profiler summary will not be saved.";
  } else {
  poplar::printGraphSummary(stream, p_e.graphProfile, opts);
  