Don't do a half-hearted recompilation check in compileOne
Don't do a half-hearted recompilation check in compileOne

Summary:
The isNothing maybe_old_linkable check predates
48bc81ad466edfc80237015dbe5d78ba70eb5095, which fixed #481 by requiring
recompilation information to be passed in as an argument to compileOne.
As a result, the check here is redundant: the client has already taken
a look at the object file to see if it is available or not.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Test Plan: validate

Reviewers: simonmar, austin

Subscribers: carter, thomie

Differential Revision: https://phabricator.haskell.org/D594

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