Add the test case for builtin abs() function

Add the test case for builtin abs() function

All the integer value types check are supported.
Please use the case named compiler_abs_xxxx,
where xxxx means the data type such as int2, char4

Signed-off-by: Junyan He <junyan.he@linux.intel.com>
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>
Reviewed-by: Xing, Homer <homer.xing@intel.com>
Reviewed-by: Song, Ruiling <ruiling.song@intel.com>