message: remove duplicate alignment checks
diff: @@ -510,7 +510,6 @@ impl<'a, 'tcx> Memory<'a, 'tcx> {
  if size == 0 {
  return Ok(&[]);
  }
  - self.check_align(ptr, align, size)?;
  if self.relocations(ptr, size)?.count() != 0 {
  return Err(EvalError::ReadPointerAsBytes);
  }
  @@ -522,7 +521,6 @@ impl<'a, 'tcx> Memory<'a, 'tcx> {
  if size == 0 {
  return Ok(&mut []);
  }
  - self.check_align(ptr, align, size)?;
  self.clear_relocations(ptr, size)?;
  self.mark_definedness(ptr, size, true)?;
  self.get_bytes_unchecked_mut(ptr, size, align)
  