add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

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cat <<EOF
static __always_inline ${ret}
${arch}${atomic}_${pfx}dec${sfx}${order}(${atomic}_t *v)
{
    ${retstmt}${arch}${atomic}_${pfx}sub${sfx}${order}(1, v);
}
EOF