Expose listPackageConfigMap
Expose listPackageConfigMap

This is useful for code that needs to search the package config map for
packages satisfying a certain condition.

Reviewed By: ezyang

Differential Revision: https://phabricator.haskell.org/D695

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