Fix warnings in cmm/CmmOpt.hs
Fix warnings in cmm/CmmOpt.hs

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