Refactor peelManyCalls
Refactor peelManyCalls

its first argument is just used for its length (the arity of the call).
So changing the type to Int to reflect that.

Also add a note [Demands from unsaturated function calls] that hopefully
comprehensively and comprehensibly explains what is going on here.

hferreiro/replay,da-x/ghc,mcschroeder/ghc,gcampax/ghc,TomMD/ghc,ryantm/ghc,shlevy/ghc,mfine/ghc,AlexanderPankiv/ghc,ml9951/ghc,spacekitteh/smcghc,gridaphobe/ghc,fmthoma/ghc,wxwxwwxxx/ghc,spacekitteh/smcghc,snoyberg/ghc,ml9951/ghc,TomMD/ghc,anton-dessiatov/ghc,siddhanathan/ghc,hferreiro/replay,olsner/ghc,anton-dessiatov/ghc,fmthoma/ghc,wxwxwwxxx/ghc,da-x/ghc,holzensp/ghc,oldmanmike/ghc,green-haskell/ghc,snoyberg/ghc,mettekou/ghc,nushio3/ghc,sdiehl/ghc,tibbe/ghc,anton-dessiatov/ghc,AlexanderPankiv/ghc,mfine/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,nkaretnikov/ghc,ml9951/ghc,bitemyapp/ghc,AlexanderPankiv/ghc,christiaanb/ghc,shlevy/ghc,shlevy/ghc,gridaphobe/ghc,wxwxwwxxx/ghc,acowley/ghc,mfine/ghc,snoyberg/ghc,jstolarek/ghc,spacekitteh/smcghc,ryantm/ghc,vTurbine/ghc,tjakway/ghcjvm,urbanslug/ghc,mcschroeder/ghc,nushio3/ghc,bitemyapp/ghc,vikraman/ghc,vikraman/ghc,christiaanb/ghc,urbanslug/ghc,lukexi/ghc,bitemyapp/ghc,green-haskell/ghc,TomMD/ghc,nathyong/microghc-ghc,olsner/ghc,ghc-android/ghc,oldmanmike/ghc,acowley/ghc,ml9951/ghc,ml9951/ghc,elieux/ghc,gridaphobe/ghc,lukexi/ghc-7.8-arm64,wxwxwwxxx/ghc,jstolarek/ghc,tjakway/ghcjvm,mettekou/ghc,hferreiro/replay,frantisekfarka/ghc-dsi,ezyang/ghc,mettekou/ghc,shlevy/ghc,TomMD/ghc,gcampax/ghc,nushio3/ghc,siddhanathan/ghc,sgillespie/ghc,anton-dessiatov/ghc,gridaphobe/ghc,gcampax/ghc,tjakway/ghcjvm,oldmanmike/ghc,gcampax/ghc,da-x/ghc,christiaanb/ghc,green-haskell/ghc,olsner/ghc,nathyong/microghc-ghc,sdiehl/ghc,elieux/ghc,bitemyapp/ghc,acowley/ghc,vTurbine/ghc,forked-upstream-packages-for-ghcjs/ghc,vTurbine/ghc,hferreiro/replay,tibbe/ghc,vikraman/ghc,anton-dessiatov/ghc,nathyong/microghc-ghc,gcampax/ghc,nathyong/microghc-ghc,sdiehl/ghc,elieux/ghc,ghc-android/ghc,anton-dessiatov/ghc,anton-dessiatov/ghc,forked-upstream-packages-for-ghcjs/ghc,mcschroeder/ghc,elieux/ghc,fmthoma/ghc,nkaretnikov/ghc,nkaretnikov/ghc,mcschroeder/ghc,AlexanderPankiv/ghc,sdiehl/ghc,green-haskell/ghc,hferreiro/replay,mcschroeder/ghc,mettekou/ghc,mfine/ghc,gcampax/ghc,sgillespie/ghc,elieux/ghc,GaloisInc/halvm-ghc,olsner/ghc,nushio3/ghc,fmthoma/ghc,snoyberg/ghc,ml9951/ghc,ezyang/ghc,holzensp/ghc,mettekou/ghc,GaloisInc/halvm-ghc,mcschroeder/ghc,siddhanathan/ghc,sdiehl/ghc,urbanslug/ghc,fmthoma/ghc,sgillespie/ghc,frantisekfarka/ghc-dsi,lukexi/ghc,gridaphobe/ghc,AlexanderPankiv/ghc,acowley/ghc,mfine/ghc,wxwxwwxxx/ghc,lukexi/ghc,hferreiro/replay,vTurbine/ghc,ezyang/ghc,vikraman/ghc,jstolarek/ghc,snoyberg/ghc,AlexanderPankiv/ghc,TomMD/ghc,da-x/ghc,ryantm/ghc,spacekitteh/smcghc,ghc-android/ghc,mfine/ghc,forked-upstream-packages-for-ghcjs/ghc,oldmanmike/ghc,christiaanb/ghc,ezyang/ghc,lukexi/ghc-7.8-arm64,ryantm/ghc,wxwxwwxxx/ghc,shlevy/ghc,oldmanmike/ghc,gcampax/ghc,wxwxwwxxx/ghc,sdiehl/ghc,siddhanathan/ghc,forked-upstream-packages-for-ghcjs/ghc,olsner/ghc,GaloisInc/halvm-ghc,ezyang/ghc,ryantm/ghc,mcschroeder/ghc,da-x/ghc,lukexi/ghc,oldmanmike/ghc,sgillespie/ghc,ghc-android/ghc,snoyberg/ghc,gridaphobe/ghc,nkaretnikov/ghc,sdiehl/ghc,vikraman/ghc,urbanslug/ghc,TomMD/ghc,mfine/ghc,elieux/ghc,fmthoma/ghc,holzensp/ghc,lukexi/ghc-7.8-arm64,GaloisInc/halvm-ghc,nkaretnikov/ghc,holzensp/ghc,elieux/ghc,christiaanb/ghc,frantisekfarka/ghc-dsi,forked-upstream-packages-for-ghcjs/ghc,shlevy/ghc,sgillespie/ghc,mettekou/ghc,tjakway/ghcjvm,tibbe/ghc,siddhanathan/ghc,vikraman/ghc,acowley/ghc,tibbe/ghc,forked-upstream-packages-for-ghcjs/ghc,nathyong/microghc-ghc,tjakway/ghcjvm,shlevy/ghc,lukexi/ghc-7.8-arm64,sgillespie/ghc,jstolarek/ghc,spacekitteh/smcghc,da-x/ghc,da-x/ghc,AlexanderPankiv/ghc,vikraman/ghc,nushio3/ghc,lukexi/ghc-7.8-arm64,siddhanathan/ghc,christiaanb/ghc,holzensp/ghc,TomMD/ghc,tjakway/ghcjvm,ghc-android/ghc,urbanslug/ghc,nushio3/ghc,mettekou/ghc,hferreiro/replay,jstolarek/ghc,fmthoma/ghc,christiaanb/ghc,bitemyapp/ghc,nushio3/ghc,nathyong/microghc-ghc,frantisekfarka/ghc-dsi,siddhanathan/ghc,gridaphobe/ghc,ml9951/ghc,olsner/ghc,acowley/ghc,vTurbine/ghc,GaloisInc/halvm-ghc,frantisekfarka/ghc-dsi,ezyang/ghc,urbanslug/ghc,acowley/ghc,urbanslug/ghc,olsner/ghc,vTurbine/ghc,ezyang/ghc,GaloisInc/halvm-ghc,green-haskell/ghc,ml9951/ghc,nkaretnikov/ghc,vTurbine/ghc,forked-upstream-packages-for-ghcjs/ghc,tibbe/ghc,sgillespie/ghc,nkaretnikov/ghc,tjakway/ghcjvm,ghc-android/ghc,ghc-android/ghc,snoyberg/ghc,lukexi/ghc,nathyong/microghc-ghc