message: make the find_miri returned path actually exist
diff: @@ -212,7 +212,11 @@ fn find_miri() -> PathBuf {
  return path.into();
  }
  let mut path = std::env::current_exe().expect("current executable path invalid");
  + if cfg!(windows) {
  + path.set_file_name("miri.exe");
  + } else {
  path.set_file_name("miri");
  + }
  path
  }
  