Small optimizations to the LUT lookup on HVX.
Small optimizations to the LUT lookup on HVX.

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