message: [TF:TRT] Fix a build failure.
  Variable K is only used for TRT 7+. Put the variable definition under #if.
diff: @@ -475,8 +475,10 @@ Status TrtShapeOptimizationProfile::RestoreProfiles(
  #endif
  int n_profiles = engine->getNbOptimizationProfiles();
  need_profiles_ = n_profiles > 0;
  +#if IS_TRT_VERSION_GE(7, 1, 3, 0)
  int n_bindings = engine->getNbBindings();
  int K = n_bindings / n_profiles;
  +#endif
  int n_inputs = GetNumberOfEngineInputs(engine);
  VLOG(2) << "Attempting to restore " << n_profiles << " profiles, each with "
  << n_inputs << " inputs";
  