Fix warnings in utils/GraphColor.hs
Fix warnings in utils/GraphColor.hs

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