make device_copy::copy_memory WEAK to metal.cpp to avoid "MachO doesn't support COMDATs
make device_copy::copy_memory WEAK to metal.cpp to avoid "MachO doesn't support COMDATs

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