heuristic for Intel
added performance test for cv::norm with NORM_RELATIVE
Merge pull request #2763 from ilya-lavrenov:tapi_perf_norm_relative
added performance test for cv::meanStdDev with mask
Merge pull request #2776 from ilya-lavrenov:tapi_meanstddev
Merge pull request #2723 from ilya-lavrenov:tapi_intel_vector_width
Merge branch 'master' of https://github.com/Itseez/opencv.git