Parse the variables in a type signature in the order given (Trac #8945)
Parse the variables in a type signature in the order given (Trac #8945)

This is just making the parser behave more sensibly, and return
the list [x,y,z] from the signature
   x,y,z :: Int
rathe than [x,z,y] as now.

Turns out that the other use of sig_vars *did* do the right
thing already.

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