message: Transform the last error place to an immediate instead
diff: @@ -415,8 +415,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  "__errno_location" | "__error" => {
  let errno_place = this.machine.last_error.unwrap();
  - let errno_scalar: Scalar<Tag> = this.check_mplace_access(errno_place.into(), Some(Size::from_bits(32)))?.unwrap().into();
  - this.write_scalar(errno_scalar, dest)?;
  + this.write_scalar(errno_place.to_ref().to_scalar()?, dest)?;
  }
  "getenv" => {
  