Auto merge of #16875 - bzbarsky:dir-no-revalidation, r=emilio
Auto merge of #16875 - bzbarsky:dir-no-revalidation, r=emilio

Don't require style sharing cache invalidation for :dir

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fiji-flo/servo,sadmansk/servo,ConnorGBrewster/servo,pyfisch/servo,peterjoel/servo,canaltinova/servo,jimberlage/servo,KiChjang/servo,eddyb/servo,thiagopnts/servo,emilio/servo,pyfisch/servo,peterjoel/servo,avadacatavra/servo,peterjoel/servo,saneyuki/servo,upsuper/servo,rnestler/servo,notriddle/servo,canaltinova/servo,dati91/servo,thiagopnts/servo,splav/servo,larsbergstrom/servo,upsuper/servo,cbrewster/servo,thiagopnts/servo,splav/servo,dsandeephegde/servo,mattnenterprise/servo,splav/servo,larsbergstrom/servo,saneyuki/servo,canaltinova/servo,pyfisch/servo,mbrubeck/servo,SimonSapin/servo,nnethercote/servo,dsandeephegde/servo,mbrubeck/servo,peterjoel/servo,mattnenterprise/servo,CJ8664/servo,emilio/servo,nnethercote/servo,dsandeephegde/servo,nnethercote/servo,DominoTree/servo,emilio/servo,larsbergstrom/servo,mattnenterprise/servo,paulrouget/servo,anthgur/servo,ConnorGBrewster/servo,upsuper/servo,KiChjang/servo,eddyb/servo,mbrubeck/servo,nnethercote/servo,szeged/servo,jimberlage/servo,rnestler/servo,fiji-flo/servo,CJ8664/servo,notriddle/servo,szeged/servo,jimberlage/servo,splav/servo,pyfisch/servo,notriddle/servo,dati91/servo,thiagopnts/servo,szeged/servo,ConnorGBrewster/servo,splav/servo,anthgur/servo,anthgur/servo,notriddle/servo,nnethercote/servo,CJ8664/servo,canaltinova/servo,KiChjang/servo,cbrewster/servo,emilio/servo,SimonSapin/servo,fiji-flo/servo,mattnenterprise/servo,emilio/servo,mbrubeck/servo,jimberlage/servo,CJ8664/servo,pyfisch/servo,dsandeephegde/servo,paulrouget/servo,dati91/servo,rnestler/servo,notriddle/servo,cbrewster/servo,emilio/servo,jimberlage/servo,KiChjang/servo,larsbergstrom/servo,dati91/servo,cbrewster/servo,eddyb/servo,dsandeephegde/servo,dati91/servo,szeged/servo,ConnorGBrewster/servo,dati91/servo,saneyuki/servo,pyfisch/servo,thiagopnts/servo,eddyb/servo,sadmansk/servo,emilio/servo,canaltinova/servo,pyfisch/servo,eddyb/servo,splav/servo,peterjoel/servo,paulrouget/servo,peterjoel/servo,szeged/servo,SimonSapin/servo,nnethercote/servo,szeged/servo,upsuper/servo,saneyuki/servo,splav/servo,DominoTree/servo,notriddle/servo,dsandeephegde/servo,anthgur/servo,paulrouget/servo,nnethercote/servo,anthgur/servo,larsbergstrom/servo,DominoTree/servo,rnestler/servo,upsuper/servo,anthgur/servo,thiagopnts/servo,paulrouget/servo,saneyuki/servo,eddyb/servo,notriddle/servo,paulrouget/servo,pyfisch/servo,mbrubeck/servo,fiji-flo/servo,notriddle/servo,mbrubeck/servo,saneyuki/servo,avadacatavra/servo,CJ8664/servo,mattnenterprise/servo,pyfisch/servo,mattnenterprise/servo,jimberlage/servo,szeged/servo,avadacatavra/servo,larsbergstrom/servo,notriddle/servo,larsbergstrom/servo,DominoTree/servo,emilio/servo,DominoTree/servo,anthgur/servo,splav/servo,paulrouget/servo,nnethercote/servo,CJ8664/servo,eddyb/servo,avadacatavra/servo,DominoTree/servo,dsandeephegde/servo,SimonSapin/servo,thiagopnts/servo,nnethercote/servo,avadacatavra/servo,KiChjang/servo,rnestler/servo,KiChjang/servo,dati91/servo,anthgur/servo,larsbergstrom/servo,nnethercote/servo,DominoTree/servo,jimberlage/servo,SimonSapin/servo,szeged/servo,upsuper/servo,ConnorGBrewster/servo,cbrewster/servo,KiChjang/servo,DominoTree/servo,rnestler/servo,peterjoel/servo,DominoTree/servo,notriddle/servo,mattnenterprise/servo,saneyuki/servo,emilio/servo,thiagopnts/servo,avadacatavra/servo,KiChjang/servo,szeged/servo,szeged/servo,canaltinova/servo,dati91/servo,pyfisch/servo,paulrouget/servo,emilio/servo,saneyuki/servo,fiji-flo/servo,sadmansk/servo,jimberlage/servo,ConnorGBrewster/servo,upsuper/servo,avadacatavra/servo,sadmansk/servo,rnestler/servo,mbrubeck/servo,canaltinova/servo,dsandeephegde/servo,SimonSapin/servo,avadacatavra/servo,mbrubeck/servo,peterjoel/servo,SimonSapin/servo,fiji-flo/servo,CJ8664/servo,rnestler/servo,peterjoel/servo,paulrouget/servo,KiChjang/servo,fiji-flo/servo,mattnenterprise/servo,saneyuki/servo,splav/servo,peterjoel/servo,ConnorGBrewster/servo,canaltinova/servo,cbrewster/servo,upsuper/servo,sadmansk/servo,paulrouget/servo,eddyb/servo,KiChjang/servo,sadmansk/servo,sadmansk/servo,CJ8664/servo,splav/servo,larsbergstrom/servo,jimberlage/servo,fiji-flo/servo,larsbergstrom/servo,DominoTree/servo,cbrewster/servo,cbrewster/servo,SimonSapin/servo,ConnorGBrewster/servo,sadmansk/servo,saneyuki/servo