script: Avoid an allocation when getting attribute data.
script: Avoid an allocation when getting attribute data.

15% improvement in selector matching performance on the rainbow page.

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ramani/servo,rentongzhang/servo,nnethercote/servo,wartman4404/servo,deokjinkim/servo,pyecs/servo,hyowon/servo,nnethercote/servo,walac/servo,peterjoel/servo,Adenilson/prototype-viewing-distance,thiagopnts/servo,saneyuki/servo,shrenikgala/servo,RenaudParis/servo,larsbergstrom/servo,jimberlage/servo,rixrix/servo,huonw/servo,rixrix/servo,evilpie/servo,thiagopnts/servo,hyowon/servo,youprofit/servo,runarberg/servo,dvberkel/servo,dagnir/servo,emilio/servo,zentner-kyle/servo,RenaudParis/servo,caldwell/servo,KiChjang/servo,jdramani/servo,notriddle/servo,sadmansk/servo,rixrix/servo,kindersung/servo,AnthonyBroadCrawford/servo,peterjoel/servo,WriterOfAlicrow/servo,seanmonstar/servo,AnthonyBroadCrawford/servo,ryancanhelpyou/servo,dsandeephegde/servo,aweinstock314/servo,tafia/servo,jimberlage/servo,indykish/servo,Shraddha512/servo,GreenRecycleBin/servo,emilio/servo,DominoTree/servo,Adenilson/prototype-viewing-distance,cbrewster/servo,youprofit/servo,tempbottle/servo,dati91/servo,g-k/servo,caldwell/servo,tschneidereit/servo,zentner-kyle/servo,dagnir/servo,evilpie/servo,bjwbell/servo,sadmansk/servo,wartman4404/servo,vks/servo,DominoTree/servo,mattnenterprise/servo,rixrix/servo,ruud-v-a/servo,dagnir/servo,dmarcos/servo,snf/servo,deokjinkim/servo,dhananjay92/servo,echochamber/servo,upsuper/servo,KiChjang/servo,tempbottle/servo,caldwell/servo,aidanhs/servo,notriddle/servo,luniv/servo,AnthonyBroadCrawford/servo,zentner-kyle/servo,juzer10/servo,akosel/servo,snf/servo,RenaudParis/servo,GyrosOfWar/servo,juzer10/servo,echochamber/servo,echochamber/servo,nnethercote/servo,canaltinova/servo,karlito40/servo,mt2d2/servo,CJ8664/servo,nnethercote/servo,mdibaiee/servo,froydnj/servo,splav/servo,pyecs/servo,ryancanhelpyou/servo,zhangjunlei26/servo,saratang/servo,shrenikgala/servo,srbhklkrn/SERVOENGINE,bfrohs/servo,GreenRecycleBin/servo,GreenRecycleBin/servo,SimonSapin/servo,avadacatavra/servo,tempbottle/servo,fiji-flo/servo,dati91/servo,SimonSapin/servo,mukilan/servo,rnestler/servo,rixrix/servo,KiChjang/servo,DominoTree/servo,jgraham/servo,KiChjang/servo,DominoTree/servo,vks/servo,shrenikgala/servo,meh/servo,mattnenterprise/servo,dsandeephegde/servo,anthgur/servo,tempbottle/servo,ConnorGBrewster/servo,echochamber/servo,mrobinson/servo,codemac/servo,DominoTree/servo,larsbergstrom/servo,froydnj/servo