Use llvm-3.5 on Travis
Use llvm-3.5 on Travis

to avoid a build failure with T5681(optllvm). According to Ben Gamari,
llvm-3.4 is known to be not working with GHC HEAD.

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