FIX #1688: Givens in checkLoop are not that rigid after all - This patch re-instates the policy of 6.6.1 to zonk the given constraints   in the simplifier loop.
FIX #1688: Givens in checkLoop are not that rigid after all
- This patch re-instates the policy of 6.6.1 to zonk the given constraints
  in the simplifier loop.

MERGE TO STABLE

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