message: [XLA] Pass -dump-input=always when invoking FileCheck.
  This causes FileCheck to give much more informative errors.
diff: @@ -47,8 +47,9 @@ StatusOr<bool> RunFileCheck(const string& input, const string& pattern) {
  }
  tensorflow::SubProcess file_check_process;
  - file_check_process.SetProgram(file_check_path,
  - {file_check_path, "-v", pattern_path});
  + file_check_process.SetProgram(
  + file_check_path,
  + {file_check_path, "-v", "-dump-input=always", pattern_path});
  file_check_process.SetChannelAction(tensorflow::CHAN_STDIN,
  tensorflow::ACTION_PIPE);
  file_check_process.SetChannelAction(tensorflow::CHAN_STDERR,
  