Rework HALIDE_REGISTER_CHOOSER in a hopefully-MSVC-compatible way
Rework HALIDE_REGISTER_CHOOSER in a hopefully-MSVC-compatible way

psuriana/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide