message: fix tests on 32bit
diff: @@ -56,7 +56,8 @@ fn test_align_to() {
  }
  {
  - let (l, m, r) = unsafe { s.align_to::<u64>() }; // requested alignment higher than allocation alignment
  + #[repr(align(8))] struct Align8(u64);
  + let (l, m, r) = unsafe { s.align_to::<Align8>() }; // requested alignment higher than allocation alignment
  assert_eq!(l.len(), 4*N);
  assert_eq!(r.len(), 0);
  assert_eq!(m.len(), 0);
  