message: Remove unchecked_shr/shl from intrinsics
diff: @@ -443,42 +443,6 @@ impl<'a, 'mir, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'mir, 'tcx, super:
  self.write_value(value, dest)?;
  }
  - "unchecked_shl" => {
  - let bits = dest.layout.size.bytes() as u128 * 8;
  - let l = self.read_value(args[0])?;
  - let r = self.read_value(args[1])?;
  - let rval = r.to_scalar()?.to_bytes()?;
  - if rval >= bits {
  - return err!(Intrinsic(
  - format!("Overflowing shift by {} in unchecked_shl", rval),
  - ));
  - }
  - self.binop_ignore_overflow(
  - mir::BinOp::Shl,
  - l,
  - r,
  - dest,
  - )?;
  - }
  -
  - "unchecked_shr" => {
  - let bits = dest.layout.size.bytes() as u128 * 8;
  - let l = self.read_value(args[0])?;
  - let r = self.read_value(args[1])?;
  - let rval = r.to_scalar()?.to_bytes()?;
  - if rval >= bits {
  - return err!(Intrinsic(
  - format!("Overflowing shift by {} in unchecked_shr", rval),
  - ));
  - }
  - self.binop_ignore_overflow(
  - mir::BinOp::Shr,
  - l,
  - r,
  - dest,
  - )?;
  - }
  -
  "unchecked_div" => {
  let l = self.read_value(args[0])?;
  let r = self.read_value(args[1])?;
  