message: Implement float -> int/uint cast
diff: @@ -518,6 +518,18 @@ fn trans_stmt<'a, 'tcx: 'a>(
  };
  lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
  }
  + (ty::Float(_), ty::Int(_)) => {
  + let from = operand.load_scalar(fx);
  + let i_type = fx.clif_type(to_ty).unwrap();
  + let res = fx.bcx.ins().fcvt_to_sint_sat(i_type, from);
  + lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
  + }
  + (ty::Float(_), ty::Uint(_)) => {
  + let from = operand.load_scalar(fx);
  + let i_type = fx.clif_type(to_ty).unwrap();
  + let res = fx.bcx.ins().fcvt_to_uint_sat(i_type, from);
  + lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
  + }
  (ty::Int(_), ty::Float(_)) => {
  let from_ty = fx.clif_type(from_ty).unwrap();
  let from = operand.load_scalar(fx);
  