Use XZ compression by default
Use XZ compression by default

Resolves #11434.

mcschroeder/ghc,sgillespie/ghc,sdiehl/ghc,oldmanmike/ghc,snoyberg/ghc,nushio3/ghc,olsner/ghc,sdiehl/ghc,snoyberg/ghc,sgillespie/ghc,vikraman/ghc,vikraman/ghc,tjakway/ghcjvm,sdiehl/ghc,sgillespie/ghc,gridaphobe/ghc,vikraman/ghc,mettekou/ghc,nushio3/ghc,nushio3/ghc,vTurbine/ghc,olsner/ghc,gridaphobe/ghc,gridaphobe/ghc,tjakway/ghcjvm,tjakway/ghcjvm,ezyang/ghc,sgillespie/ghc,oldmanmike/ghc,nushio3/ghc,ezyang/ghc,shlevy/ghc,vikraman/ghc,mcschroeder/ghc,gridaphobe/ghc,vTurbine/ghc,sdiehl/ghc,olsner/ghc,mcschroeder/ghc,sgillespie/ghc,sdiehl/ghc,gridaphobe/ghc,vTurbine/ghc,shlevy/ghc,nushio3/ghc,tjakway/ghcjvm,snoyberg/ghc,ezyang/ghc,shlevy/ghc,nushio3/ghc,vikraman/ghc,vTurbine/ghc,mettekou/ghc,olsner/ghc,mettekou/ghc,oldmanmike/ghc,mcschroeder/ghc,ezyang/ghc,sgillespie/ghc,snoyberg/ghc,ezyang/ghc,vTurbine/ghc,olsner/ghc,vTurbine/ghc,olsner/ghc,shlevy/ghc,shlevy/ghc,mcschroeder/ghc,mcschroeder/ghc,tjakway/ghcjvm,mcschroeder/ghc,ezyang/ghc,vikraman/ghc,mettekou/ghc,sgillespie/ghc,nushio3/ghc,snoyberg/ghc,ezyang/ghc,snoyberg/ghc,sdiehl/ghc,gridaphobe/ghc,vTurbine/ghc,mettekou/ghc,tjakway/ghcjvm,olsner/ghc,tjakway/ghcjvm,mettekou/ghc,oldmanmike/ghc,sdiehl/ghc,shlevy/ghc,snoyberg/ghc,oldmanmike/ghc,shlevy/ghc,vikraman/ghc,oldmanmike/ghc,mettekou/ghc,oldmanmike/ghc,gridaphobe/ghc