Revert "Eta-expand argument to foldr in mapM_ for []"
Revert "Eta-expand argument to foldr in mapM_ for []"

This change lacked justification (or a test!) for its improvements, and
I merged it on a sweep of Phabricator without fixing this. Trac #10034.

This reverts commit 7cf87fc6928f0252d9f61719e2344e6c69237079.

fmthoma/ghc,urbanslug/ghc,TomMD/ghc,gcampax/ghc,nushio3/ghc,nkaretnikov/ghc,nkaretnikov/ghc,AlexanderPankiv/ghc,AlexanderPankiv/ghc,oldmanmike/ghc,elieux/ghc,AlexanderPankiv/ghc,ml9951/ghc,urbanslug/ghc,mettekou/ghc,vikraman/ghc,acowley/ghc,ml9951/ghc,olsner/ghc,ml9951/ghc,vTurbine/ghc,ghc-android/ghc,urbanslug/ghc,snoyberg/ghc,mfine/ghc,ml9951/ghc,christiaanb/ghc,AlexanderPankiv/ghc,sdiehl/ghc,fmthoma/ghc,da-x/ghc,wxwxwwxxx/ghc,mettekou/ghc,vikraman/ghc,snoyberg/ghc,shlevy/ghc,wxwxwwxxx/ghc,mettekou/ghc,wxwxwwxxx/ghc,gcampax/ghc,mcschroeder/ghc,anton-dessiatov/ghc,olsner/ghc,nushio3/ghc,mettekou/ghc,gridaphobe/ghc,gridaphobe/ghc,gcampax/ghc,elieux/ghc,da-x/ghc,snoyberg/ghc,tjakway/ghcjvm,GaloisInc/halvm-ghc,christiaanb/ghc,vTurbine/ghc,ghc-android/ghc,vTurbine/ghc,nkaretnikov/ghc,shlevy/ghc,vTurbine/ghc,acowley/ghc,gridaphobe/ghc,acowley/ghc,siddhanathan/ghc,wxwxwwxxx/ghc,ghc-android/ghc,AlexanderPankiv/ghc,mfine/ghc,GaloisInc/halvm-ghc,wxwxwwxxx/ghc,christiaanb/ghc,acowley/ghc,mettekou/ghc,vikraman/ghc,da-x/ghc,ezyang/ghc,tjakway/ghcjvm,sdiehl/ghc,gcampax/ghc,sdiehl/ghc,oldmanmike/ghc,christiaanb/ghc,elieux/ghc,ghc-android/ghc,olsner/ghc,tjakway/ghcjvm,mcschroeder/ghc,oldmanmike/ghc,sgillespie/ghc,nkaretnikov/ghc,urbanslug/ghc,olsner/ghc,oldmanmike/ghc,elieux/ghc,ml9951/ghc,ml9951/ghc,tjakway/ghcjvm,vTurbine/ghc,fmthoma/ghc,shlevy/ghc,da-x/ghc,snoyberg/ghc,acowley/ghc,vTurbine/ghc,ghc-android/ghc,anton-dessiatov/ghc,da-x/ghc,christiaanb/ghc,elieux/ghc,nkaretnikov/ghc,da-x/ghc,shlevy/ghc,mcschroeder/ghc,TomMD/ghc,da-x/ghc,urbanslug/ghc,olsner/ghc,ml9951/ghc,ml9951/ghc,olsner/ghc,mfine/ghc,tjakway/ghcjvm,AlexanderPankiv/ghc,ezyang/ghc,urbanslug/ghc,tjakway/ghcjvm,TomMD/ghc,acowley/ghc,shlevy/ghc,tjakway/ghcjvm,mcschroeder/ghc,TomMD/ghc,nkaretnikov/ghc,mfine/ghc,vikraman/ghc,sgillespie/ghc,sdiehl/ghc,mcschroeder/ghc,vikraman/ghc,anton-dessiatov/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,mettekou/ghc,anton-dessiatov/ghc,sgillespie/ghc,GaloisInc/halvm-ghc,nushio3/ghc,mcschroeder/ghc,snoyberg/ghc,elieux/ghc,acowley/ghc,sdiehl/ghc,nkaretnikov/ghc,wxwxwwxxx/ghc,fmthoma/ghc,ghc-android/ghc,fmthoma/ghc,GaloisInc/halvm-ghc,mfine/ghc,shlevy/ghc,gcampax/ghc,christiaanb/ghc,gridaphobe/ghc,AlexanderPankiv/ghc,siddhanathan/ghc,olsner/ghc,urbanslug/ghc,siddhanathan/ghc,anton-dessiatov/ghc,siddhanathan/ghc,elieux/ghc,anton-dessiatov/ghc,nushio3/ghc,ezyang/ghc,sgillespie/ghc,mcschroeder/ghc,gcampax/ghc,sdiehl/ghc,GaloisInc/halvm-ghc,anton-dessiatov/ghc,TomMD/ghc,sgillespie/ghc,ezyang/ghc,gcampax/ghc,ezyang/ghc,nushio3/ghc,gridaphobe/ghc,mfine/ghc,sdiehl/ghc,gridaphobe/ghc,ezyang/ghc,sgillespie/ghc,vikraman/ghc,ezyang/ghc,siddhanathan/ghc,christiaanb/ghc,nushio3/ghc,sgillespie/ghc,siddhanathan/ghc,fmthoma/ghc,mettekou/ghc,siddhanathan/ghc,ghc-android/ghc,wxwxwwxxx/ghc,oldmanmike/ghc,mfine/ghc,oldmanmike/ghc,GaloisInc/halvm-ghc,shlevy/ghc,TomMD/ghc,vTurbine/ghc,fmthoma/ghc,nushio3/ghc,snoyberg/ghc,TomMD/ghc,gridaphobe/ghc,vikraman/ghc,snoyberg/ghc