Remove dead code
Remove dead code

RdrHsSyn.extractGenericPatTyVars was a leftover from the
old generic classes.

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