Fix rts/T9579 tests on OS X
Fix rts/T9579 tests on OS X

Sed on OS X does not understand 's/[0-9]\+ bytes/NUM bytes/g' but
sed on Linux and OS X do understand 's/[0-9]* bytes/NUM bytes/g'.

Test Plan: Run all rts/T9579 tests on Linux and Mac

Reviewers: thomie, austin, bgamari

Differential Revision: https://phabricator.haskell.org/D1394

mettekou/ghc,mettekou/ghc,oldmanmike/ghc,shlevy/ghc,gridaphobe/ghc,mettekou/ghc,shlevy/ghc,elieux/ghc,GaloisInc/halvm-ghc,gridaphobe/ghc,sgillespie/ghc,GaloisInc/halvm-ghc,elieux/ghc,tjakway/ghcjvm,elieux/ghc,tjakway/ghcjvm,olsner/ghc,shlevy/ghc,da-x/ghc,nushio3/ghc,GaloisInc/halvm-ghc,vTurbine/ghc,mcschroeder/ghc,GaloisInc/halvm-ghc,mcschroeder/ghc,AlexanderPankiv/ghc,shlevy/ghc,gridaphobe/ghc,gridaphobe/ghc,da-x/ghc,vTurbine/ghc,vikraman/ghc,sdiehl/ghc,shlevy/ghc,mettekou/ghc,olsner/ghc,snoyberg/ghc,shlevy/ghc,oldmanmike/ghc,GaloisInc/halvm-ghc,mettekou/ghc,tjakway/ghcjvm,vTurbine/ghc,GaloisInc/halvm-ghc,vikraman/ghc,vTurbine/ghc,AlexanderPankiv/ghc,vikraman/ghc,ezyang/ghc,olsner/ghc,AlexanderPankiv/ghc,gridaphobe/ghc,mettekou/ghc,tjakway/ghcjvm,snoyberg/ghc,vTurbine/ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,olsner/ghc,da-x/ghc,vikraman/ghc,sgillespie/ghc,mcschroeder/ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,nushio3/ghc,ezyang/ghc,sdiehl/ghc,ezyang/ghc,vikraman/ghc,elieux/ghc,elieux/ghc,mcschroeder/ghc,oldmanmike/ghc,mcschroeder/ghc,olsner/ghc,da-x/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,da-x/ghc,nushio3/ghc,elieux/ghc,nushio3/ghc,oldmanmike/ghc,vTurbine/ghc,oldmanmike/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,oldmanmike/ghc,ezyang/ghc,elieux/ghc,sgillespie/ghc,shlevy/ghc,sdiehl/ghc,AlexanderPankiv/ghc,ezyang/ghc,nushio3/ghc,snoyberg/ghc,snoyberg/ghc,sdiehl/ghc,da-x/ghc,snoyberg/ghc,sgillespie/ghc,olsner/ghc,sgillespie/ghc,gridaphobe/ghc,gridaphobe/ghc,vikraman/ghc,olsner/ghc,nushio3/ghc,snoyberg/ghc,nushio3/ghc,mcschroeder/ghc,sgillespie/ghc,vikraman/ghc,tjakway/ghcjvm,ezyang/ghc,vTurbine/ghc,sgillespie/ghc,ezyang/ghc,da-x/ghc,AlexanderPankiv/ghc,snoyberg/ghc,mettekou/ghc,mcschroeder/ghc