message: [TF:XLA] Using char separator instead of std::string separator for better performance.
diff: @@ -2708,7 +2708,7 @@ bool HloParser::ParseConvolutionDimensionNumbers(
  // The str is expected to have 3 items, lhs, rhs, out, and it must look like
  // lhs_rhs->out, that is, the first separator is "_" and the second is "->".
  - std::vector<string> split1 = absl::StrSplit(str, "_");
  + std::vector<string> split1 = absl::StrSplit(str, '_');
  if (split1.size() != 2) {
  LOG(FATAL) << "expects 3 items: lhs, rhs, and output dims, but sees "
  << str;
  