message: Reduce size of nanoseconds
diff: @@ -537,8 +537,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  allocation.write_scalar(
  tcx,
  tp.offset(Size::from_bits(64), tcx)?,
  - Scalar::from_u64(duration.subsec_nanos() as u64).into(),
  - Size::from_bits(64),
  + Scalar::from_u32(duration.subsec_nanos()).into(),
  + Size::from_bits(32),
  )?;
  this.write_scalar(Scalar::from_int(0i32, dest.layout.size), dest)?;
  