HscMain: Delete some unused code
HscMain: Delete some unused code

Reviewers: bgamari, austin

Reviewed By: austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1936

shlevy/ghc,sgillespie/ghc,sdiehl/ghc,mettekou/ghc,shlevy/ghc,sgillespie/ghc,shlevy/ghc,ezyang/ghc,tjakway/ghcjvm,ezyang/ghc,vTurbine/ghc,tjakway/ghcjvm,mcschroeder/ghc,sgillespie/ghc,vikraman/ghc,olsner/ghc,snoyberg/ghc,vikraman/ghc,mcschroeder/ghc,vTurbine/ghc,ezyang/ghc,olsner/ghc,vikraman/ghc,sdiehl/ghc,vTurbine/ghc,oldmanmike/ghc,mettekou/ghc,oldmanmike/ghc,snoyberg/ghc,mettekou/ghc,mettekou/ghc,ezyang/ghc,snoyberg/ghc,tjakway/ghcjvm,mcschroeder/ghc,mettekou/ghc,mettekou/ghc,snoyberg/ghc,sgillespie/ghc,oldmanmike/ghc,vikraman/ghc,shlevy/ghc,ezyang/ghc,vTurbine/ghc,vikraman/ghc,vTurbine/ghc,vikraman/ghc,vTurbine/ghc,snoyberg/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,olsner/ghc,ezyang/ghc,vTurbine/ghc,oldmanmike/ghc,vikraman/ghc,sdiehl/ghc,shlevy/ghc,oldmanmike/ghc,sdiehl/ghc,mettekou/ghc,olsner/ghc,mcschroeder/ghc,mcschroeder/ghc,snoyberg/ghc,oldmanmike/ghc,mcschroeder/ghc,olsner/ghc,tjakway/ghcjvm,olsner/ghc,tjakway/ghcjvm,sdiehl/ghc,shlevy/ghc,mcschroeder/ghc,sgillespie/ghc,sgillespie/ghc,olsner/ghc,sgillespie/ghc,oldmanmike/ghc,tjakway/ghcjvm,tjakway/ghcjvm,snoyberg/ghc