message: avoid fallback logic (and we do not need the flag value currently anyway)
diff: @@ -208,11 +208,9 @@ fn getrandom<'tcx>(
  // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
  // neither of which have any effect on our current PRNG.
  - let flags = this.read_scalar(flags)?;
  - // Either `i32` or `isize` is fine.
  - if flags.to_machine_isize(this).is_err() {
  - flags.to_i32()?;
  - }
  + let _flags = this.read_scalar(flags)?;
  + // FIXME: Check that this is an integer type of the right size.
  + // Currently, some callers pass i32 and some usize, is that even allowed?
  this.gen_random(ptr, len)?;
  this.write_scalar(Scalar::from_machine_usize(len, this), dest)?;
  