message: Fix explicit cast test
diff: // compile-flags: -Zmiri-seed=0000000000000000
  +
  +// This returns a miri pointer at type usize, if the argument is a proper pointer
  fn transmute_ptr_to_int<T>(x: *const T) -> usize {
  - unsafe { std::mem::transmute::<*const T, usize>(x) * 1 }
  + unsafe { std::mem::transmute(x) }
  }
  fn main() {
  