message: Added command line parameter for specifying resuming image.
diff: @@ -111,6 +111,10 @@ struct Run {
  )]
  loader: Option<LoaderName>,
  + #[cfg(feature = "backend:singlepass")]
  + #[structopt(long = "resume")]
  + resume: Option<String>,
  +
  #[structopt(long = "command-name", hidden = true)]
  command_name: Option<String>,
  @@ -531,7 +535,14 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
  let start_raw: extern "C" fn(&mut Ctx) =
  ::std::mem::transmute(start.get_vm_func());
  - let mut image: Option<InstanceImage> = None;
  + let mut image: Option<InstanceImage> = if let Some(ref path) = options.resume {
  + let mut f = File::open(path).unwrap();
  + let mut out: Vec<u8> = vec![];
  + f.read_to_end(&mut out).unwrap();
  + Some(InstanceImage::from_bytes(&out).expect("failed to decode image"))
  + } else {
  + None
  + };
  loop {
  let ret = if let Some(image) = image.take() {
  let msm = instance
  