message: [tstring] Avoid temporary std::string creation in DecodeRawOp.
diff: @@ -43,7 +43,7 @@ class DecodeRawOp : public OpKernel {
  int64 str_size = -1;
  auto flat_in = input.flat<tstring>();
  for (int64 i = 0; i < flat_in.size(); ++i) {
  - const string& in_str = flat_in(i);
  + const tstring& in_str = flat_in(i);
  if (str_size == -1) {
  str_size = in_str.size();
  } else {
  