rts: drop unused 'SpinLockCount' typedef
rts: drop unused 'SpinLockCount' typedef

Summary: Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

Test Plan: git grep, git log -SSpinLockCount, build test

Reviewers: austin, simonmar

Reviewed By: austin, simonmar

Subscribers: phaskell, simonmar, relrod, carter

Differential Revision: https://phabricator.haskell.org/D76

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