support __gen_ocl_simd_any and __gen_ocl_simd_all

support __gen_ocl_simd_any and __gen_ocl_simd_all

short __gen_ocl_simd_any(short x):
if x in any of the active threads in the same SIMD is not zero,
the return value for all these threads is not zero, otherwise, zero returned.

short __gen_ocl_simd_all(short x):
only if x in all of the active threads in the same SIMD is not zero,
the return value for all these threads is not zero, otherwise, zero returned.

for example:
to check if a special value exists in a global buffer, use one SIMD
to do the searching parallelly, the whole SIMD can stop the task
once the value is found. The key kernel code looks like:

for(; ; ) {
  ...
  if (__gen_ocl_simd_any(...))
    break;   //the whole SIMD stop the searching
}

Signed-off-by: Guo Yejun <yejun.guo@intel.com>
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>