Refactor the parsing of data type declarations
Refactor the parsing of data type declarations

This is a minor change to the parser that tidies it up a bit,
and allows us to parse

	data T :: *
        data S :: * -> *

just like  

	data T 
	data S a


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