message: fix stack offset check
diff: @@ -257,6 +257,7 @@ impl Machine {
  pub fn release_locations_keep_state<E: Emitter>(&self, assembler: &mut E, locs: &[Location]) {
  let mut delta_stack_offset: usize = 0;
  + let mut stack_offset = self.stack_offset.0;
  for loc in locs.iter().rev() {
  match *loc {
  @@ -265,9 +266,10 @@ impl Machine {
  unreachable!();
  }
  let offset = (-x) as usize;
  - if offset != self.stack_offset.0 {
  + if offset != stack_offset {
  unreachable!();
  }
  + stack_offset -= 8;
  delta_stack_offset += 8;
  }
  _ => {}
  