message: [XLA] Do not dump FileCheck input when test succeeds.
  The strategy to always dump FileCheck input generates a large amount of log spam, and makes debugging other failures difficult.
  We only need the full input if the test has failed.
diff: @@ -49,7 +49,7 @@ 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", "-dump-input=always", pattern_path});
  + {file_check_path, "-v", "-dump-input=fail", pattern_path});
  file_check_process.SetChannelAction(tensorflow::CHAN_STDIN,
  tensorflow::ACTION_PIPE);
  file_check_process.SetChannelAction(tensorflow::CHAN_STDERR,
  