base: Fix (**) implementation for Data.Complex
base: Fix (**) implementation for Data.Complex

See the extensive discussion in #8539.

Signed-off-by: Austin Seipp <7ea35d812706d9213868749011af1ed4fa2f6aa0@well-typed.com>

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