[move sift.cpp] Optimize SIFT with AVX2
[move sift.cpp] Optimize SIFT with AVX2

original commit: https://github.com/opencv/opencv_contrib/commit/c5e55dfde96307fef12fc55f63d6a600fd784582

opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv