halide_set_num_threads(0) should recalculate the default value properly
halide_set_num_threads(0) should recalculate the default value properly

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