Fusion rule for "foldr k z (x:build g)"
Fusion rule for "foldr k z (x:build g)"

There seem to be various issues with general fold/cons and even
cons/build rules, but it seems pretty clear to me that the simple
fold/cons/build rule is a good idea. It doesn't do much for nofib
allocation, but it seems to improve some other analyses and speed
several benchmarks up. Implements #9536.

bitemyapp/ghc,snoyberg/ghc,nathyong/microghc-ghc,anton-dessiatov/ghc,vikraman/ghc,vTurbine/ghc,ghc-android/ghc,mettekou/ghc,ezyang/ghc,anton-dessiatov/ghc,TomMD/ghc,acowley/ghc,anton-dessiatov/ghc,AlexanderPankiv/ghc,shlevy/ghc,AlexanderPankiv/ghc,fmthoma/ghc,da-x/ghc,jstolarek/ghc,gridaphobe/ghc,ml9951/ghc,ghc-android/ghc,nathyong/microghc-ghc,nkaretnikov/ghc,sdiehl/ghc,gcampax/ghc,snoyberg/ghc,mcschroeder/ghc,gridaphobe/ghc,siddhanathan/ghc,nkaretnikov/ghc,sdiehl/ghc,jstolarek/ghc,gcampax/ghc,urbanslug/ghc,forked-upstream-packages-for-ghcjs/ghc,mettekou/ghc,gcampax/ghc,elieux/ghc,mcschroeder/ghc,mfine/ghc,nushio3/ghc,shlevy/ghc,fmthoma/ghc,sdiehl/ghc,fmthoma/ghc,vikraman/ghc,christiaanb/ghc,anton-dessiatov/ghc,sdiehl/ghc,jstolarek/ghc,ml9951/ghc,gcampax/ghc,olsner/ghc,tjakway/ghcjvm,tjakway/ghcjvm,mcschroeder/ghc,vTurbine/ghc,siddhanathan/ghc,tjakway/ghcjvm,ezyang/ghc,forked-upstream-packages-for-ghcjs/ghc,vikraman/ghc,elieux/ghc,mcschroeder/ghc,vikraman/ghc,ezyang/ghc,nathyong/microghc-ghc,snoyberg/ghc,siddhanathan/ghc,green-haskell/ghc,mfine/ghc,nkaretnikov/ghc,gridaphobe/ghc,fmthoma/ghc,olsner/ghc,vikraman/ghc,mettekou/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,urbanslug/ghc,siddhanathan/ghc,nkaretnikov/ghc,elieux/ghc,christiaanb/ghc,forked-upstream-packages-for-ghcjs/ghc,AlexanderPankiv/ghc,sgillespie/ghc,mfine/ghc,shlevy/ghc,shlevy/ghc,oldmanmike/ghc,tjakway/ghcjvm,oldmanmike/ghc,forked-upstream-packages-for-ghcjs/ghc,christiaanb/ghc,sgillespie/ghc,olsner/ghc,sgillespie/ghc,GaloisInc/halvm-ghc,tjakway/ghcjvm,bitemyapp/ghc,fmthoma/ghc,siddhanathan/ghc,da-x/ghc,TomMD/ghc,sdiehl/ghc,GaloisInc/halvm-ghc,mfine/ghc,mettekou/ghc,wxwxwwxxx/ghc,TomMD/ghc,fmthoma/ghc,ghc-android/ghc,ezyang/ghc,TomMD/ghc,mettekou/ghc,nathyong/microghc-ghc,wxwxwwxxx/ghc,mettekou/ghc,mettekou/ghc,sgillespie/ghc,jstolarek/ghc,ezyang/ghc,tjakway/ghcjvm,nkaretnikov/ghc,acowley/ghc,vTurbine/ghc,olsner/ghc,urbanslug/ghc,AlexanderPankiv/ghc,christiaanb/ghc,sdiehl/ghc,green-haskell/ghc,mcschroeder/ghc,AlexanderPankiv/ghc,oldmanmike/ghc,forked-upstream-packages-for-ghcjs/ghc,wxwxwwxxx/ghc,snoyberg/ghc,gridaphobe/ghc,ghc-android/ghc,mfine/ghc,gcampax/ghc,anton-dessiatov/ghc,gcampax/ghc,nathyong/microghc-ghc,nushio3/ghc,anton-dessiatov/ghc,oldmanmike/ghc,wxwxwwxxx/ghc,wxwxwwxxx/ghc,siddhanathan/ghc,bitemyapp/ghc,vTurbine/ghc,ml9951/ghc,elieux/ghc,TomMD/ghc,olsner/ghc,bitemyapp/ghc,nathyong/microghc-ghc,gridaphobe/ghc,nushio3/ghc,snoyberg/ghc,snoyberg/ghc,mcschroeder/ghc,vTurbine/ghc,anton-dessiatov/ghc,forked-upstream-packages-for-ghcjs/ghc,nushio3/ghc,snoyberg/ghc,nushio3/ghc,urbanslug/ghc,urbanslug/ghc,da-x/ghc,urbanslug/ghc,shlevy/ghc,ezyang/ghc,green-haskell/ghc,gridaphobe/ghc,christiaanb/ghc,ghc-android/ghc,da-x/ghc,green-haskell/ghc,tjakway/ghcjvm,acowley/ghc,oldmanmike/ghc,AlexanderPankiv/ghc,nathyong/microghc-ghc,ml9951/ghc,siddhanathan/ghc,ghc-android/ghc,gridaphobe/ghc,gcampax/ghc,da-x/ghc,fmthoma/ghc,elieux/ghc,ml9951/ghc,mfine/ghc,TomMD/ghc,jstolarek/ghc,christiaanb/ghc,nkaretnikov/ghc,da-x/ghc,shlevy/ghc,sgillespie/ghc,ezyang/ghc,wxwxwwxxx/ghc,GaloisInc/halvm-ghc,ml9951/ghc,shlevy/ghc,nushio3/ghc,GaloisInc/halvm-ghc,nkaretnikov/ghc,da-x/ghc,TomMD/ghc,vikraman/ghc,sdiehl/ghc,bitemyapp/ghc,christiaanb/ghc,ghc-android/ghc,acowley/ghc,elieux/ghc,mcschroeder/ghc,forked-upstream-packages-for-ghcjs/ghc,ml9951/ghc,olsner/ghc,ml9951/ghc,vTurbine/ghc,urbanslug/ghc,AlexanderPankiv/ghc,wxwxwwxxx/ghc,green-haskell/ghc,acowley/ghc,acowley/ghc,oldmanmike/ghc,GaloisInc/halvm-ghc,olsner/ghc,GaloisInc/halvm-ghc,mfine/ghc,nushio3/ghc,sgillespie/ghc,sgillespie/ghc,elieux/ghc,acowley/ghc,vTurbine/ghc,vikraman/ghc