message: Don't spam the logs.
diff: @@ -1712,7 +1712,6 @@ Status ConstantFolding::RunOptimizationPass(Cluster* cluster,
  Status ConstantFolding::Optimize(Cluster* cluster, const GrapplerItem& item,
  GraphDef* output) {
  - LOG(INFO) << "Graph before: " << item.graph.DebugString();
  nodes_to_preserve_ = item.NodesToPreserve();
  for (const auto& feed : item.feed) {
  feed_nodes_.insert(NodeName(feed.first));
  @@ -1739,7 +1738,6 @@ Status ConstantFolding::Optimize(Cluster* cluster, const GrapplerItem& item,
  *output->mutable_library() = item.graph.library();
  *output->mutable_versions() = item.graph.versions();
  - LOG(INFO) << "Graph after: " << output->DebugString();
  return Status::OK();
  }
  