More benchmark cleanup
More benchmark cleanup

oli-obk/rust-serde,JohnHeitmann/serde,Ticki/serde,serde-rs/serde,skade/serde,tempbottle/serde,infinityb/serde,csmulhern/serde,jmesmon/serde,Hoverbear/serde,Byron/serde,3Hren/serde,sidred10/serde,eefriedman/serde,thorbenk/serde,erickt/serde,pcwalton/serde