Cascade declarations in reverse order, skipping those already seen
Cascade declarations in reverse order, skipping those already seen

Previously we processed them in forward order, latter dcelarations for
the same property overriding any earlier one, making the work of
converting the earlier ones to a computed value redundant.

Maintaining a bit field of "seen" properties will also help fixing
#2288.

froydnj/servo,huonw/servo,tempbottle/servo,zhangjunlei26/servo,pyfisch/servo,dsandeephegde/servo,jlegendary/servo,aidanhs/servo,indykish/servo,peterjoel/servo,brendandahl/servo,szeged/servo,thiagopnts/servo,emilio/servo,karlito40/servo,mbrubeck/servo,akosel/servo,KiChjang/servo,pgonda/servo,vks/servo,zentner-kyle/servo,Adenilson/prototype-viewing-distance,emilio/servo,mukilan/servo,rentongzhang/servo,eddyb/servo,indykish/servo,ConnorGBrewster/servo,dati91/servo,canaltinova/servo,dmarcos/servo,notriddle/servo,GreenRecycleBin/servo,steveklabnik/servo,Adenilson/prototype-viewing-distance,emilio/servo,GreenRecycleBin/servo,anthgur/servo,rentongzhang/servo,seanmonstar/servo,szeged/servo,dsandeephegde/servo,indykish/servo,thiagopnts/servo,echochamber/servo,evilpie/servo,bjwbell/servo,indykish/servo,meh/servo,shrenikgala/servo,caldwell/servo,tschneidereit/servo,saratang/servo,indykish/servo,dati91/servo,Shraddha512/servo,runarberg/servo,KiChjang/servo,AnthonyBroadCrawford/servo,mdibaiee/servo,mattnenterprise/servo,avadacatavra/servo,eddyb/servo,GyrosOfWar/servo,fiji-flo/servo,nerith/servo,mbrubeck/servo,ryancanhelpyou/servo,akosel/servo,bjwbell/servo,splav/servo,splav/servo,saneyuki/servo,juzer10/servo,pgonda/servo,CJ8664/servo,nrc/servo,pyfisch/servo,RenaudParis/servo,WriterOfAlicrow/servo,zentner-kyle/servo,snf/servo,s142857/servo,dhananjay92/servo,bfrohs/servo,mt2d2/servo,indykish/servo,dhananjay92/servo,pyecs/servo,wartman4404/servo,mbrubeck/servo,WriterOfAlicrow/servo,rnestler/servo,pgonda/servo,mattnenterprise/servo,jimberlage/servo,jimberlage/servo,avadacatavra/servo,boghison/servo,thiagopnts/servo,emilio/servo,mattnenterprise/servo,ruud-v-a/servo,nick-thompson/servo,notriddle/servo,mukilan/servo,samfoo/servo,GreenRecycleBin/servo,shrenikgala/servo,g-k/servo,rentongzhang/servo,mdibaiee/servo,rentongzhang/servo,shrenikgala/servo,luniv/servo,hyowon/servo,dvberkel/servo,hyowon/servo,notriddle/servo,evilpie/servo,echochamber/servo,KiChjang/servo,cbrewster/servo,peterjoel/servo,ruud-v-a/servo,echochamber/servo,ruud-v-a/servo,pyfisch/servo,j3parker/servo,tafia/servo,thiagopnts/servo,tschneidereit/servo,mt2d2/servo,tschneidereit/servo,szeged/servo,snf/servo,anthgur/servo,upsuper/servo,tempbottle/servo,codemac/servo,dagnir/servo,anthgur/servo,samfoo/servo,splav/servo,karlito40/servo,GyrosOfWar/servo,ryancanhelpyou/servo,srbhklkrn/SERVOENGINE,boghison/servo,ryancanhelpyou/servo,paulrouget/servo,runarberg/servo,shrenikgala/servo,zhangjunlei26/servo,hyowon/servo,RenaudParis/servo,SimonSapin/servo,paulrouget/servo,thiagopnts/servo,tafia/servo,nerith/servo,zhangjunlei26/servo,nerith/servo,saneyuki/servo,youprofit/servo,dmarcos/servo,mdibaiee/servo,notriddle/servo,ryancanhelpyou/servo,avadacatavra/servo,mt2d2/servo,jimberlage/servo,huonw/servo,dvberkel/servo,pyecs/servo,dhananjay92/servo,saratang/servo,jgraham/servo,akosel/servo,fiji-flo/servo,dagnir/servo,dsandeephegde/servo,echochamber/servo,karlito40/servo,nnethercote/servo,szeged/servo,mt2d2/servo,KiChjang/servo,srbhklkrn/SERVOENGINE,Adenilson/prototype-viewing-distance,steveklabnik/servo,thiagopnts/servo,AnthonyBroadCrawford/servo,steveklabnik/servo,SimonSapin/servo,evilpie/servo,hyowon/servo,nerith/servo,CJ8664/servo,ConnorGBrewster/servo,michaelwu/servo,A-deLuna/servo,pyfisch/servo,vks/servo,pgonda/servo,jimberlage/servo,eddyb/servo,wpgallih/servo,j3parker/servo,CJ8664/servo,fiji-flo/servo,saratang/servo,GreenRecycleBin/servo,g-k/servo,upsuper/servo,aweinstock314/servo,tafia/servo,KiChjang/servo,nnethercote/servo,ryancanhelpyou/servo,j3parker/servo,chotchki/servo,brendandahl/servo,jimberlage/servo,saneyuki/servo,meh/servo,bjwbell/servo,juzer10/servo,sadmansk/servo,dati91/servo,WriterOfAlicrow/servo,ryancanhelpyou/servo,splav/servo,saneyuki/servo,WriterOfAlicrow/servo,jimberlage/servo,paulrouget/servo,Shraddha512/servo,jlegendary/servo,walac/servo,eddyb/servo,emilio/servo,bfrohs/servo,tafia/servo,jgraham/servo,pyecs/servo,peterjoel/servo,deokjinkim/servo,notriddle/servo,larsbergstrom/servo,mukilan/servo,runarberg/servo,boghison/servo,caldwell/servo,AnthonyBroadCrawford/servo,snf/servo,jdramani/servo,luniv/servo,DominoTree/servo,indykish/servo,nick-thompson/servo,kindersung/servo,wartman4404/servo,rnestler/servo,GyrosOfWar/servo,srbhklkrn/SERVOENGINE,shrenikgala/servo,mbrubeck/servo,tschneidereit/servo,DominoTree/servo,emilio/servo,dati91/servo,deokjinkim/servo,zentner-kyle/servo,j3parker/servo,mt2d2/servo,pgonda/servo,fiji-flo/servo,rnestler/servo,vks/servo,akosel/servo,avadacatavra/servo,dagnir/servo,avadacatavra/servo,fiji-flo/servo,ruud-v-a/servo,pgonda/servo,larsbergstrom/servo,ConnorGBrewster/servo,nerith/servo,nrc/servo,zhangjunlei26/servo,dvberkel/servo,canaltinova/servo,ruud-v-a/servo,rnestler/servo,nick-thompson/servo,nnethercote/servo,DominoTree/servo,KiChjang/servo,sadmansk/servo,chotchki/servo,aidanhs/servo,GreenRecycleBin/servo,rentongzhang/servo,jimberlage/servo,thiagopnts/servo,echochamber/servo,jdramani/servo,deokjinkim/servo,meh/servo,wpgallih/servo,tempbottle/servo,nerith/servo,nnethercote/servo,deokjinkim/servo,mbrubeck/servo,CJ8664/servo,seanmonstar/servo,notriddle/servo,pyfisch/servo,nrc/servo,kindersung/servo,dmarcos/servo,kindersung/servo,wartman4404/servo,wartman4404/servo,dsandeephegde/servo,paulrouget/servo,kindersung/servo,ConnorGBrewster/servo,ryancanhelpyou/servo,Shraddha512/servo,karlito40/servo,cbrewster/servo,rixrix/servo,pyecs/servo,rixrix/servo,dagnir/servo,saneyuki/servo,luniv/servo,dhananjay92/servo,upsuper/servo,WriterOfAlicrow/servo,paulrouget/servo,AnthonyBroadCrawford/servo,splav/servo,boghison/servo,ConnorGBrewster/servo,pyfisch/servo,wpgallih/servo,pyfisch/servo,meh/servo,eddyb/servo,splav/servo,peterjoel/servo,jlegendary/servo,GyrosOfWar/servo,anthgur/servo,saneyuki/servo,dagnir/servo,luniv/servo,youprofit/servo,canaltinova/servo,kindersung/servo,hyowon/servo,bfrohs/servo,sadmansk/servo,nick-thompson/servo,mukilan/servo,bjwbell/servo,dsandeephegde/servo,froydnj/servo,larsbergstrom/servo,cbrewster/servo,RenaudParis/servo,nnethercote/servo,nrc/servo,jlegendary/servo,emilio/servo,mdibaiee/servo,snf/servo,dsandeephegde/servo,rixrix/servo,seanmonstar/servo,RenaudParis/servo,jgraham/servo,akosel/servo,evilpie/servo,larsbergstrom/servo,aweinstock314/servo,srbhklkrn/SERVOENGINE,rentongzhang/servo,pyfisch/servo,mukilan/servo,nerith/servo,rixrix/servo,nick-thompson/servo,cbrewster/servo,CJ8664/servo,dhananjay92/servo,SimonSapin/servo,anthgur/servo,hyowon/servo,cbrewster/servo,wartman4404/servo,vks/servo,notriddle/servo,seanmonstar/servo,caldwell/servo,codemac/servo,anthgur/servo,dhananjay92/servo,froydnj/servo,aweinstock314/servo,chotchki/servo,rixrix/servo,jgraham/servo,ruud-v-a/servo,CJ8664/servo,fiji-flo/servo,peterjoel/servo,saratang/servo,indykish/servo,huonw/servo,aidanhs/servo,KiChjang/servo,froydnj/servo,splav/servo,dvberkel/servo,steveklabnik/servo,walac/servo,emilio/servo,sadmansk/servo,tempbottle/servo,paulrouget/servo,mattnenterprise/servo,aweinstock314/servo,s142857/servo,akosel/servo,szeged/servo,DominoTree/servo,saneyuki/servo,seanmonstar/servo,upsuper/servo,dsandeephegde/servo,CJ8664/servo,DominoTree/servo,juzer10/servo,dsandeephegde/servo,larsbergstrom/servo,cbrewster/servo,Adenilson/prototype-viewing-distance,jgraham/servo,vks/servo,youprofit/servo,mbrubeck/servo,g-k/servo,paulrouget/servo,walac/servo,zentner-kyle/servo,upsuper/servo,Shraddha512/servo,walac/servo,avadacatavra/servo,jlegendary/servo,chotchki/servo,meh/servo,splav/servo,walac/servo,rixrix/servo,dati91/servo,canaltinova/servo,pyecs/servo,michaelwu/servo,mukilan/servo,bfrohs/servo,juzer10/servo,larsbergstrom/servo,ConnorGBrewster/servo,dhananjay92/servo,splav/servo,wartman4404/servo,tempbottle/servo,akosel/servo,Adenilson/prototype-viewing-distance,SimonSapin/servo,brendandahl/servo,deokjinkim/servo,GreenRecycleBin/servo,tempbottle/servo,michaelwu/servo,peterjoel/servo,j3parker/servo,mattnenterprise/servo,s142857/servo,tempbottle/servo,mbrubeck/servo,nrc/servo,tafia/servo,nick-thompson/servo,j3parker/servo,walac/servo,WriterOfAlicrow/servo,juzer10/servo,samfoo/servo,meh/servo,Shraddha512/servo,wpgallih/servo,luniv/servo,steveklabnik/servo,caldwell/servo,SimonSapin/servo,notriddle/servo,pyecs/servo,vks/servo,nrc/servo,samfoo/servo,ConnorGBrewster/servo,SimonSapin/servo,zhangjunlei26/servo,AnthonyBroadCrawford/servo,evilpie/servo,tafia/servo,runarberg/servo,evilpie/servo,shrenikgala/servo,upsuper/servo,rixrix/servo,codemac/servo,vks/servo,nnethercote/servo,mdibaiee/servo,huonw/servo,boghison/servo,cbrewster/servo,eddyb/servo,karlito40/servo,pyecs/servo,Shraddha512/servo,paulrouget/servo,larsbergstrom/servo,huonw/servo,dati91/servo,zhangjunlei26/servo,rnestler/servo,srbhklkrn/SERVOENGINE,codemac/servo,KiChjang/servo,szeged/servo,snf/servo,rentongzhang/servo,fiji-flo/servo,WriterOfAlicrow/servo,deokjinkim/servo,eddyb/servo,evilpie/servo,rixrix/servo,anthgur/servo,youprofit/servo,juzer10/servo,A-deLuna/servo,brendandahl/servo,wpgallih/servo,canaltinova/servo,brendandahl/servo,samfoo/servo,boghison/servo,tschneidereit/servo,zhangjunlei26/servo,luniv/servo,jdramani/servo,samfoo/servo,peterjoel/servo,luniv/servo,evilpie/servo,s142857/servo,upsuper/servo,walac/servo,echochamber/servo,peterjoel/servo,RenaudParis/servo,nnethercote/servo,runarberg/servo,srbhklkrn/SERVOENGINE,splav/servo,aidanhs/servo,jlegendary/servo,juzer10/servo,A-deLuna/servo,srbhklkrn/SERVOENGINE,zhangjunlei26/servo,snf/servo,avadacatavra/servo,RenaudParis/servo,RenaudParis/servo,brendandahl/servo,saratang/servo,pyfisch/servo,tafia/servo,GreenRecycleBin/servo,DominoTree/servo,paulrouget/servo,rixrix/servo,szeged/servo,saneyuki/servo,zentner-kyle/servo,jimberlage/servo,echochamber/servo,paulrouget/servo,aweinstock314/servo,s142857/servo,huonw/servo,A-deLuna/servo,mattnenterprise/servo,aidanhs/servo,steveklabnik/servo,g-k/servo,caldwell/servo,saneyuki/servo,codemac/servo,dmarcos/servo,bfrohs/servo,huonw/servo,indykish/servo,jlegendary/servo,GreenRecycleBin/servo,wpgallih/servo,peterjoel/servo,steveklabnik/servo,jimberlage/servo,CJ8664/servo,GyrosOfWar/servo,mdibaiee/servo,canaltinova/servo,notriddle/servo,mt2d2/servo,runarberg/servo,bjwbell/servo,rnestler/servo,aweinstock314/servo,g-k/servo,sadmansk/servo,aweinstock314/servo,dvberkel/servo,brendandahl/servo,SimonSapin/servo,szeged/servo,aidanhs/servo,SimonSapin/servo,michaelwu/servo,codemac/servo,KiChjang/servo,s142857/servo,pyfisch/servo,michaelwu/servo,evilpie/servo,KiChjang/servo,A-deLuna/servo,chotchki/servo,emilio/servo,ConnorGBrewster/servo,dagnir/servo,saratang/servo,dmarcos/servo,thiagopnts/servo,rnestler/servo,pgonda/servo,karlito40/servo,mdibaiee/servo,anthgur/servo,meh/servo,boghison/servo,caldwell/servo,Adenilson/prototype-viewing-distance,dmarcos/servo,AnthonyBroadCrawford/servo,nnethercote/servo,zentner-kyle/servo,nnethercote/servo,notriddle/servo,froydnj/servo,nrc/servo,mattnenterprise/servo,jgraham/servo,emilio/servo,wpgallih/servo,saneyuki/servo,saratang/servo,GreenRecycleBin/servo,GyrosOfWar/servo,cbrewster/servo,hyowon/servo,deokjinkim/servo,froydnj/servo,peterjoel/servo,kindersung/servo,jdramani/servo,mt2d2/servo,sadmansk/servo,chotchki/servo,upsuper/servo,rnestler/servo,bjwbell/servo,DominoTree/servo,wpgallih/servo,jdramani/servo,g-k/servo,youprofit/servo,jgraham/servo,DominoTree/servo,canaltinova/servo,codemac/servo,Adenilson/prototype-viewing-distance,seanmonstar/servo,dagnir/servo,Shraddha512/servo,s142857/servo,DominoTree/servo,caldwell/servo,jdramani/servo,youprofit/servo,dmarcos/servo,aidanhs/servo,tschneidereit/servo,nnethercote/servo,tschneidereit/servo,dati91/servo,j3parker/servo,canaltinova/servo,snf/servo,A-deLuna/servo,avadacatavra/servo,bjwbell/servo,szeged/servo,sadmansk/servo,mattnenterprise/servo,wartman4404/servo,g-k/servo,zhangjunlei26/servo,larsbergstrom/servo,eddyb/servo,wpgallih/servo,mbrubeck/servo,A-deLuna/servo,nick-thompson/servo,bfrohs/servo,larsbergstrom/servo,AnthonyBroadCrawford/servo,larsbergstrom/servo,michaelwu/servo,GyrosOfWar/servo,shrenikgala/servo,dvberkel/servo,karlito40/servo,dvberkel/servo,kindersung/servo,szeged/servo,youprofit/servo,runarberg/servo,sadmansk/servo,zentner-kyle/servo,samfoo/servo,fiji-flo/servo,DominoTree/servo,jdramani/servo,dati91/servo