Recursively sort memory report sub-trees.
Recursively sort memory report sub-trees.

This puts the larger sub-trees first. E.g. this:
```
|       1.04 MiB -- url(http://en.wikipedia.org/wiki/Main_Page)
|          0.26 MiB -- display-list
|          0.78 MiB -- paint-task       # new output line
|             0.78 MiB -- buffer-map    # new output line
```
becomes this:
```
|       1.04 MiB -- url(http://en.wikipedia.org/wiki/Main_Page)
|          0.78 MiB -- paint-task       # new output line
|             0.78 MiB -- buffer-map    # new output line
|          0.26 MiB -- display-list
```
This matches how Firefox's about:memory works.

Now that this is done for all sub-trees, the ad hoc sorting done for
Linux segments is no longer necessary, and has been removed.

tschneidereit/servo,SimonSapin/servo,meh/servo,bjwbell/servo,steveklabnik/servo,dagnir/servo,saratang/servo,ryancanhelpyou/servo,aweinstock314/servo,g-k/servo,AnthonyBroadCrawford/servo,aidanhs/servo,dati91/servo,saneyuki/servo,runarberg/servo,peterjoel/servo,notriddle/servo,GreenRecycleBin/servo,RenaudParis/servo,avadacatavra/servo,pyecs/servo,peterjoel/servo,zhangjunlei26/servo,nrc/servo,karlito40/servo,splav/servo,ryancanhelpyou/servo,KiChjang/servo,KiChjang/servo,g-k/servo,s142857/servo,notriddle/servo,paulrouget/servo,karlito40/servo,tafia/servo,j3parker/servo,mt2d2/servo,saneyuki/servo,larsbergstrom/servo,pyfisch/servo,akosel/servo,jimberlage/servo,thiagopnts/servo,dagnir/servo,fiji-flo/servo,canaltinova/servo,bjwbell/servo,nrc/servo,jgraham/servo,meh/servo,akosel/servo,ConnorGBrewster/servo,zentner-kyle/servo,mdibaiee/servo,tempbottle/servo,avadacatavra/servo,splav/servo,upsuper/servo,szeged/servo,notriddle/servo,walac/servo,aidanhs/servo,codemac/servo,rixrix/servo,ConnorGBrewster/servo,nnethercote/servo,akosel/servo,aweinstock314/servo,rentongzhang/servo,zhangjunlei26/servo,thiagopnts/servo,huonw/servo,rnestler/servo,huonw/servo,aweinstock314/servo,dati91/servo,dhananjay92/servo,karlito40/servo,youprofit/servo,pyfisch/servo,g-k/servo,zentner-kyle/servo,jimberlage/servo,hyowon/servo,szeged/servo,caldwell/servo,saneyuki/servo,dati91/servo,SimonSapin/servo,brendandahl/servo,zhangjunlei26/servo,DominoTree/servo,ryancanhelpyou/servo,avadacatavra/servo,saneyuki/servo,KiChjang/servo,upsuper/servo,walac/servo,A-deLuna/servo,fiji-flo/servo,bjwbell/servo,wartman4404/servo,dvberkel/servo,fiji-flo/servo,DominoTree/servo,pyfisch/servo,karlito40/servo,emilio/servo,A-deLuna/servo,tafia/servo,codemac/servo,avadacatavra/servo,mdibaiee/servo,pyecs/servo,sadmansk/servo,saneyuki/servo,ConnorGBrewster/servo,dsandeephegde/servo,notriddle/servo,canaltinova/servo,pgonda/servo,paulrouget/servo,mt2d2/servo,samfoo/servo,aweinstock314/servo,saratang/servo,WriterOfAlicrow/servo,rixrix/servo,RenaudParis/servo,boghison/servo,thiagopnts/servo,emilio/servo,j3parker/servo,mattnenterprise/servo,szeged/servo,rentongzhang/servo,youprofit/servo,RenaudParis/servo,emilio/servo,cbrewster/servo,szeged/servo,nnethercote/servo,saratang/servo,youprofit/servo,splav/servo,dati91/servo,saratang/servo,nnethercote/servo,GreenRecycleBin/servo,kindersung/servo,DominoTree/servo,ConnorGBrewster/servo,nnethercote/servo,rnestler/servo,wartman4404/servo,mbrubeck/servo,zhangjunlei26/servo,tschneidereit/servo,tschneidereit/servo,akosel/servo,s142857/servo,paulrouget/servo,anthgur/servo,vks/servo,splav/servo,A-deLuna/servo,zhangjunlei26/servo,brendandahl/servo,tschneidereit/servo,hyowon/servo,splav/servo,aweinstock314/servo,mattnenterprise/servo,upsuper/servo,eddyb/servo,A-deLuna/servo,brendandahl/servo,dsandeephegde/servo,emilio/servo,GreenRecycleBin/servo,dati91/servo,canaltinova/servo,canaltinova/servo,saratang/servo,WriterOfAlicrow/servo,dhananjay92/servo,nrc/servo,codemac/servo,huonw/servo,walac/servo,caldwell/servo,paulrouget/servo,mbrubeck/servo,nnethercote/servo,codemac/servo,caldwell/servo,huonw/servo,pyfisch/servo,rixrix/servo,mbrubeck/servo,ryancanhelpyou/servo,larsbergstrom/servo,eddyb/servo,meh/servo,runarberg/servo,dsandeephegde/servo,A-deLuna/servo,jlegendary/servo,KiChjang/servo,paulrouget/servo,jdramani/servo,walac/servo,larsbergstrom/servo,mbrubeck/servo,huonw/servo,runarberg/servo,pgonda/servo,samfoo/servo,A-deLuna/servo,tempbottle/servo,szeged/servo,mattnenterprise/servo,mattnenterprise/servo,kindersung/servo,KiChjang/servo,jgraham/servo,nick-thompson/servo,tafia/servo,boghison/servo,pyfisch/servo,rentongzhang/servo,anthgur/servo,SimonSapin/servo,paulrouget/servo,cbrewster/servo,eddyb/servo,jdramani/servo,aidanhs/servo,bjwbell/servo,deokjinkim/servo,ConnorGBrewster/servo,deokjinkim/servo,cbrewster/servo,mattnenterprise/servo,cbrewster/servo,AnthonyBroadCrawford/servo,jlegendary/servo,dvberkel/servo,bjwbell/servo,notriddle/servo,j3parker/servo,boghison/servo,dsandeephegde/servo,steveklabnik/servo,GyrosOfWar/servo,notriddle/servo,jimberlage/servo,saneyuki/servo,szeged/servo,canaltinova/servo,tschneidereit/servo,RenaudParis/servo,jimberlage/servo,pyfisch/servo,tempbottle/servo,dhananjay92/servo,aweinstock314/servo,anthgur/servo,DominoTree/servo,caldwell/servo,nick-thompson/servo,sadmansk/servo,splav/servo,dsandeephegde/servo,RenaudParis/servo,SimonSapin/servo,vks/servo,peterjoel/servo,zentner-kyle/servo,jgraham/servo,deokjinkim/servo,dati91/servo,GyrosOfWar/servo,akosel/servo,GreenRecycleBin/servo,wartman4404/servo,nerith/servo,canaltinova/servo,pyecs/servo,jdramani/servo,dati91/servo,fiji-flo/servo,larsbergstrom/servo,meh/servo,tempbottle/servo,CJ8664/servo,dhananjay92/servo,KiChjang/servo,nick-thompson/servo,emilio/servo,jimberlage/servo,nrc/servo,tempbottle/servo,tempbottle/servo,dagnir/servo,peterjoel/servo,peterjoel/servo,GyrosOfWar/servo,eddyb/servo,thiagopnts/servo,codemac/servo,peterjoel/servo,GreenRecycleBin/servo,aidanhs/servo,rnestler/servo,jimberlage/servo,splav/servo,CJ8664/servo,vks/servo,mt2d2/servo,rentongzhang/servo,akosel/servo,rnestler/servo,saratang/servo,samfoo/servo,steveklabnik/servo,aweinstock314/servo,zentner-kyle/servo,upsuper/servo,anthgur/servo,nnethercote/servo,larsbergstrom/servo,saneyuki/servo,rnestler/servo,avadacatavra/servo,fiji-flo/servo,mbrubeck/servo,aidanhs/servo,meh/servo,SimonSapin/servo,sadmansk/servo,anthgur/servo,nnethercote/servo,splav/servo,youprofit/servo,brendandahl/servo,avadacatavra/servo,pgonda/servo,vks/servo,notriddle/servo,vks/servo,eddyb/servo,runarberg/servo,avadacatavra/servo,rnestler/servo,canaltinova/servo,DominoTree/servo,dvberkel/servo,dsandeephegde/servo,kindersung/servo,rentongzhang/servo,jimberlage/servo,mdibaiee/servo,fiji-flo/servo,jgraham/servo,sadmansk/servo,boghison/servo,AnthonyBroadCrawford/servo,rentongzhang/servo,walac/servo,emilio/servo,g-k/servo,walac/servo,saneyuki/servo,ryancanhelpyou/servo,emilio/servo,cbrewster/servo,wartman4404/servo,bjwbell/servo,anthgur/servo,pgonda/servo,AnthonyBroadCrawford/servo,thiagopnts/servo,meh/servo,nick-thompson/servo,GyrosOfWar/servo,rixrix/servo,mt2d2/servo,zhangjunlei26/servo,dati91/servo,youprofit/servo,SimonSapin/servo,kindersung/servo,GreenRecycleBin/servo,dhananjay92/servo,dagnir/servo,splav/servo,boghison/servo,larsbergstrom/servo,AnthonyBroadCrawford/servo,nerith/servo,DominoTree/servo,SimonSapin/servo,emilio/servo,rixrix/servo,zhangjunlei26/servo,zhangjunlei26/servo,AnthonyBroadCrawford/servo,tschneidereit/servo,s142857/servo,GyrosOfWar/servo,j3parker/servo,larsbergstrom/servo,pyecs/servo,anthgur/servo,sadmansk/servo,vks/servo,peterjoel/servo,dagnir/servo,avadacatavra/servo,ConnorGBrewster/servo,szeged/servo,j3parker/servo,rnestler/servo,pgonda/servo,karlito40/servo,brendandahl/servo,tschneidereit/servo,mdibaiee/servo,deokjinkim/servo,nerith/servo,ConnorGBrewster/servo,SimonSapin/servo,dvberkel/servo,cbrewster/servo,caldwell/servo,peterjoel/servo,nrc/servo,wartman4404/servo,mt2d2/servo,nerith/servo,hyowon/servo,steveklabnik/servo,pyecs/servo,GreenRecycleBin/servo,cbrewster/servo,hyowon/servo,huonw/servo,fiji-flo/servo,zentner-kyle/servo,CJ8664/servo,wartman4404/servo,jdramani/servo,g-k/servo,mdibaiee/servo,s142857/servo,nnethercote/servo,pgonda/servo,KiChjang/servo,kindersung/servo,mdibaiee/servo,jdramani/servo,CJ8664/servo,pyfisch/servo,nnethercote/servo,pyfisch/servo,nrc/servo,splav/servo,CJ8664/servo,mbrubeck/servo,CJ8664/servo,pyecs/servo,jlegendary/servo,szeged/servo,runarberg/servo,nerith/servo,mbrubeck/servo,tafia/servo,samfoo/servo,mattnenterprise/servo,boghison/servo,fiji-flo/servo,nerith/servo,dvberkel/servo,nrc/servo,nick-thompson/servo,mdibaiee/servo,saneyuki/servo,paulrouget/servo,jimberlage/servo,WriterOfAlicrow/servo,brendandahl/servo,cbrewster/servo,rixrix/servo,brendandahl/servo,deokjinkim/servo,dhananjay92/servo,j3parker/servo,thiagopnts/servo,runarberg/servo,dagnir/servo,zentner-kyle/servo,KiChjang/servo,WriterOfAlicrow/servo,sadmansk/servo,jlegendary/servo,dagnir/servo,kindersung/servo,hyowon/servo,GreenRecycleBin/servo,samfoo/servo,jdramani/servo,g-k/servo,rixrix/servo,GyrosOfWar/servo,jdramani/servo,sadmansk/servo,rentongzhang/servo,upsuper/servo,A-deLuna/servo,notriddle/servo,caldwell/servo,steveklabnik/servo,larsbergstrom/servo,KiChjang/servo,aidanhs/servo,dsandeephegde/servo,dvberkel/servo,zhangjunlei26/servo,emilio/servo,mbrubeck/servo,dsandeephegde/servo,nerith/servo,youprofit/servo,eddyb/servo,anthgur/servo,boghison/servo,jgraham/servo,jlegendary/servo,youprofit/servo,peterjoel/servo,aidanhs/servo,akosel/servo,notriddle/servo,paulrouget/servo,kindersung/servo,mattnenterprise/servo,peterjoel/servo,s142857/servo,CJ8664/servo,huonw/servo,codemac/servo,pyfisch/servo,saratang/servo,tafia/servo,DominoTree/servo,WriterOfAlicrow/servo,ryancanhelpyou/servo,saneyuki/servo,samfoo/servo,bjwbell/servo,walac/servo,s142857/servo,canaltinova/servo,larsbergstrom/servo,eddyb/servo,deokjinkim/servo,notriddle/servo,rnestler/servo,CJ8664/servo,caldwell/servo,tempbottle/servo,larsbergstrom/servo,runarberg/servo,rixrix/servo,sadmansk/servo,RenaudParis/servo,nnethercote/servo,paulrouget/servo,mt2d2/servo,mattnenterprise/servo,upsuper/servo,wartman4404/servo,karlito40/servo,DominoTree/servo,pgonda/servo,AnthonyBroadCrawford/servo,karlito40/servo,jlegendary/servo,szeged/servo,vks/servo,hyowon/servo,dhananjay92/servo,eddyb/servo,upsuper/servo,meh/servo,rixrix/servo,dvberkel/servo,upsuper/servo,j3parker/servo,RenaudParis/servo,ryancanhelpyou/servo,paulrouget/servo,thiagopnts/servo,jgraham/servo,thiagopnts/servo,jlegendary/servo,hyowon/servo,nick-thompson/servo,DominoTree/servo,nick-thompson/servo,jimberlage/servo,s142857/servo,WriterOfAlicrow/servo,ConnorGBrewster/servo,deokjinkim/servo,zentner-kyle/servo,szeged/servo,WriterOfAlicrow/servo,GyrosOfWar/servo,pyecs/servo,tafia/servo,g-k/servo,jgraham/servo,steveklabnik/servo,KiChjang/servo,pyfisch/servo,tafia/servo,codemac/servo,steveklabnik/servo,GreenRecycleBin/servo,emilio/servo,samfoo/servo,DominoTree/servo,mt2d2/servo