derivedConstants: Add support for AIX
derivedConstants: Add support for AIX

On IBM AIX `nm` doesn't support reporting symbol sizes, so we need to
resort to `objdump` instead, which has a peculiar output format on AIX.

depends on D1499

Reviewers: austin, bgamari

Reviewed By: bgamari

Subscribers: kgardas, thomie

Differential Revision: https://phabricator.haskell.org/D1500

olsner/ghc,vTurbine/ghc,vTurbine/ghc,nushio3/ghc,sdiehl/ghc,shlevy/ghc,vikraman/ghc,snoyberg/ghc,mcschroeder/ghc,sdiehl/ghc,sdiehl/ghc,elieux/ghc,nushio3/ghc,snoyberg/ghc,vTurbine/ghc,mcschroeder/ghc,olsner/ghc,tjakway/ghcjvm,sgillespie/ghc,tjakway/ghcjvm,ezyang/ghc,oldmanmike/ghc,vikraman/ghc,vikraman/ghc,GaloisInc/halvm-ghc,olsner/ghc,GaloisInc/halvm-ghc,vikraman/ghc,vikraman/ghc,ezyang/ghc,gridaphobe/ghc,sdiehl/ghc,mcschroeder/ghc,oldmanmike/ghc,vikraman/ghc,olsner/ghc,snoyberg/ghc,elieux/ghc,gridaphobe/ghc,shlevy/ghc,oldmanmike/ghc,tjakway/ghcjvm,oldmanmike/ghc,ezyang/ghc,mcschroeder/ghc,nushio3/ghc,sgillespie/ghc,nushio3/ghc,snoyberg/ghc,vikraman/ghc,ezyang/ghc,GaloisInc/halvm-ghc,tjakway/ghcjvm,tjakway/ghcjvm,GaloisInc/halvm-ghc,mcschroeder/ghc,sgillespie/ghc,mettekou/ghc,GaloisInc/halvm-ghc,mettekou/ghc,gridaphobe/ghc,snoyberg/ghc,shlevy/ghc,sdiehl/ghc,vTurbine/ghc,ezyang/ghc,mettekou/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc,snoyberg/ghc,gridaphobe/ghc,olsner/ghc,elieux/ghc,oldmanmike/ghc,tjakway/ghcjvm,elieux/ghc,elieux/ghc,GaloisInc/halvm-ghc,olsner/ghc,olsner/ghc,mettekou/ghc,vTurbine/ghc,snoyberg/ghc,mcschroeder/ghc,gridaphobe/ghc,mcschroeder/ghc,shlevy/ghc,gridaphobe/ghc,sdiehl/ghc,vTurbine/ghc,tjakway/ghcjvm,ezyang/ghc,elieux/ghc,oldmanmike/ghc,sgillespie/ghc,sgillespie/ghc,nushio3/ghc,shlevy/ghc,mettekou/ghc,mettekou/ghc,GaloisInc/halvm-ghc,nushio3/ghc,nushio3/ghc,sgillespie/ghc,sgillespie/ghc,vTurbine/ghc,gridaphobe/ghc,oldmanmike/ghc,mettekou/ghc,elieux/ghc,shlevy/ghc