ECMAScript 6, 70
Assumes z is the input
z.sort((a,b)=>{r=(a)=>{for(c=d=0;++c<32;)d+=a>>c&1};return r(b)-r(a)}) Danny
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Assumes z is the input
z.sort((a,b)=>{r=(a)=>{for(c=d=0;++c<32;)d+=a>>c&1};return r(b)-r(a)})