message: on an error, always print the unnormalized stderr
diff: @@ -172,7 +172,6 @@ pub fn run_tests(config: Config) -> Result<()> {
  eprintln!();
  eprintln!("command: {:?}", miri);
  eprintln!();
  - let mut dump_stderr = true;
  for error in errors {
  match error {
  Error::ExitStatus(mode, exit_status) => eprintln!("{mode:?} got {exit_status}"),
  @@ -194,9 +193,6 @@ pub fn run_tests(config: Config) -> Result<()> {
  Error::PatternFoundInPassTest =>
  eprintln!("{}", "error pattern found in success test".red()),
  Error::OutputDiffers { path, actual, expected } => {
  - if path.extension().unwrap() == "stderr" {
  - dump_stderr = false;
  - }
  eprintln!("actual output differed from expected {}", path.display());
  eprintln!("{}", pretty_assertions::StrComparison::new(expected, actual));
  eprintln!()
  @@ -223,13 +219,10 @@ pub fn run_tests(config: Config) -> Result<()> {
  }
  eprintln!();
  }
  - // Unless we already dumped the stderr via an OutputDiffers diff, let's dump it here.
  - if dump_stderr {
  - eprintln!("actual stderr:");
  + eprintln!("full stderr:");
  eprintln!("{}", stderr);
  eprintln!();
  }
  - }
  eprintln!("{}", "failures:".red().underline());
  for (path, _miri, _revision, _errors, _stderr) in &failures {
  eprintln!(" {}", path.display());
  