Add Type_handler::is_param_long_data_type()

/**

  Check whether this parameter data type is compatible with long data.

  Used to detect whether a long data stream has been supplied to a

  incompatible data type.   

*/

inline bool is_param_long_data_type(Item_param *param)

{

  return ((param->field_type() >= MYSQL_TYPE_TINY_BLOB) &&

          (param->field_type() <= MYSQL_TYPE_STRING));

}