T-API: optimized cv::inRange

**Description:**
- read 32bit at once for `8u`

**Performance report:**
http://ocl.itseez.com/intel/export/perf/pr/2886/report/

check_regression=*OCL*InRange*
test_filter=*OCL*InRange*
test_module=core
build_examples=OFF
Is `cn==3` impossible?