Fix warnings in PprC
Fix warnings in PprC

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