halve the process count for mac wpt
halve the process count for mac wpt

...on the theory that reducing the process count will reduce timeout
problems.

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