Fix a bug in foldExpDeep
Fix a bug in foldExpDeep

This caused the CAF analysis to occasionally miss a CAF sometimes,
resulting in a very hard to diagnose crash.

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