Better implementation of is_strided_ramp.
Better implementation of is_strided_ramp.

kgnk/Halide,jiawen/Halide,ronen/Halide,ronen/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,jiawen/Halide,jiawen/Halide,jiawen/Halide,jiawen/Halide,kgnk/Halide,ronen/Halide,psuriana/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide,ronen/Halide,ronen/Halide,kgnk/Halide,jiawen/Halide,psuriana/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide,ronen/Halide,jiawen/Halide