Read the source file timestamp *before* preprocessing (#6106)
Read the source file timestamp *before* preprocessing (#6106)

jstolarek/ghc,oldmanmike/ghc,mfine/ghc,tjakway/ghcjvm,nathyong/microghc-ghc,mcschroeder/ghc,lukexi/ghc-7.8-arm64,lukexi/ghc-7.8-arm64,jstolarek/ghc,mcschroeder/ghc,ryantm/ghc,bitemyapp/ghc,snoyberg/ghc,christiaanb/ghc,fmthoma/ghc,ekmett/ghc,da-x/ghc,ezyang/ghc,christiaanb/ghc,wxwxwwxxx/ghc,mettekou/ghc,snoyberg/ghc,nomeata/ghc,ryantm/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,mfine/ghc,sgillespie/ghc,gcampax/ghc,olsner/ghc,tjakway/ghcjvm,tibbe/ghc,jstolarek/ghc,gcampax/ghc,vTurbine/ghc,AlexanderPankiv/ghc,ezyang/ghc,vTurbine/ghc,frantisekfarka/ghc-dsi,tibbe/ghc,hferreiro/replay,ml9951/ghc,snoyberg/ghc,ekmett/ghc,urbanslug/ghc,AlexanderPankiv/ghc,lukexi/ghc,mettekou/ghc,gcampax/ghc,oldmanmike/ghc,nomeata/ghc,nushio3/ghc,vikraman/ghc,nathyong/microghc-ghc,nushio3/ghc,ezyang/ghc,spacekitteh/smcghc,acowley/ghc,siddhanathan/ghc,olsner/ghc,elieux/ghc,siddhanathan/ghc,vikraman/ghc,shlevy/ghc,lukexi/ghc,vTurbine/ghc,vikraman/ghc,shlevy/ghc,tjakway/ghcjvm,frantisekfarka/ghc-dsi,gcampax/ghc,green-haskell/ghc,nathyong/microghc-ghc,wxwxwwxxx/ghc,spacekitteh/smcghc,wxwxwwxxx/ghc,da-x/ghc,ml9951/ghc,tibbe/ghc,fmthoma/ghc,GaloisInc/halvm-ghc,siddhanathan/ghc,snoyberg/ghc,oldmanmike/ghc,siddhanathan/ghc,hferreiro/replay,GaloisInc/halvm-ghc,nathyong/microghc-ghc,bitemyapp/ghc,ezyang/ghc,urbanslug/ghc,nushio3/ghc,tjakway/ghcjvm,vikraman/ghc,nathyong/microghc-ghc,mettekou/ghc,ekmett/ghc,fmthoma/ghc,elieux/ghc,da-x/ghc,GaloisInc/halvm-ghc,olsner/ghc,mcschroeder/ghc,ghc-android/ghc,lukexi/ghc,sgillespie/ghc,sdiehl/ghc,mcschroeder/ghc,da-x/ghc,nushio3/ghc,hferreiro/replay,gcampax/ghc,nkaretnikov/ghc,GaloisInc/halvm-ghc,tibbe/ghc,anton-dessiatov/ghc,AlexanderPankiv/ghc,ghc-android/ghc,elieux/ghc,jstolarek/ghc,GaloisInc/halvm-ghc,ryantm/ghc,siddhanathan/ghc,ghc-android/ghc,acowley/ghc,nkaretnikov/ghc,tjakway/ghcjvm,green-haskell/ghc,tjakway/ghcjvm,sgillespie/ghc,AlexanderPankiv/ghc,anton-dessiatov/ghc,forked-upstream-packages-for-ghcjs/ghc,mfine/ghc,frantisekfarka/ghc-dsi,fmthoma/ghc,bitemyapp/ghc,nkaretnikov/ghc,vTurbine/ghc,nomeata/ghc,nathyong/microghc-ghc,wxwxwwxxx/ghc,gridaphobe/ghc,vTurbine/ghc,gridaphobe/ghc,gcampax/ghc,nkaretnikov/ghc,ml9951/ghc,frantisekfarka/ghc-dsi,ml9951/ghc,nkaretnikov/ghc,siddhanathan/ghc,mcschroeder/ghc,fmthoma/ghc,mettekou/ghc,nomeata/ghc,nushio3/ghc,mfine/ghc,lukexi/ghc,ryantm/ghc,frantisekfarka/ghc-dsi,nomeata/ghc,nushio3/ghc,TomMD/ghc,AlexanderPankiv/ghc,mettekou/ghc,da-x/ghc,GaloisInc/halvm-ghc,nushio3/ghc,wxwxwwxxx/ghc,christiaanb/ghc,ml9951/ghc,spacekitteh/smcghc,holzensp/ghc,shlevy/ghc,ghc-android/ghc,snoyberg/ghc,ekmett/ghc,ezyang/ghc,urbanslug/ghc,mettekou/ghc,lukexi/ghc,acowley/ghc,bitemyapp/ghc,gridaphobe/ghc,green-haskell/ghc,TomMD/ghc,gridaphobe/ghc,mcschroeder/ghc,christiaanb/ghc,gridaphobe/ghc,gridaphobe/ghc,ezyang/ghc,olsner/ghc,holzensp/ghc,oldmanmike/ghc,da-x/ghc,tjakway/ghcjvm,acowley/ghc,spacekitteh/smcghc,sgillespie/ghc,AlexanderPankiv/ghc,bitemyapp/ghc,sdiehl/ghc,oldmanmike/ghc,vikraman/ghc,olsner/ghc,vikraman/ghc,elieux/ghc,fmthoma/ghc,shlevy/ghc,vikraman/ghc,acowley/ghc,mettekou/ghc,ghc-android/ghc,tibbe/ghc,anton-dessiatov/ghc,ml9951/ghc,green-haskell/ghc,mfine/ghc,TomMD/ghc,sdiehl/ghc,hferreiro/replay,oldmanmike/ghc,forked-upstream-packages-for-ghcjs/ghc,vTurbine/ghc,urbanslug/ghc,AlexanderPankiv/ghc,lukexi/ghc-7.8-arm64,ml9951/ghc,urbanslug/ghc,snoyberg/ghc,mcschroeder/ghc,olsner/ghc,sgillespie/ghc,olsner/ghc,sdiehl/ghc,sdiehl/ghc,forked-upstream-packages-for-ghcjs/ghc,ml9951/ghc,urbanslug/ghc,anton-dessiatov/ghc,nathyong/microghc-ghc,shlevy/ghc,snoyberg/ghc,anton-dessiatov/ghc,shlevy/ghc,hferreiro/replay,gcampax/ghc,siddhanathan/ghc,ghc-android/ghc,sdiehl/ghc,lukexi/ghc-7.8-arm64,christiaanb/ghc,ryantm/ghc,forked-upstream-packages-for-ghcjs/ghc,shlevy/ghc,urbanslug/ghc,sgillespie/ghc,forked-upstream-packages-for-ghcjs/ghc,hferreiro/replay,gridaphobe/ghc,lukexi/ghc-7.8-arm64,ezyang/ghc,mfine/ghc,green-haskell/ghc,elieux/ghc,holzensp/ghc,wxwxwwxxx/ghc,TomMD/ghc,christiaanb/ghc,TomMD/ghc,elieux/ghc,TomMD/ghc,spacekitteh/smcghc,wxwxwwxxx/ghc,christiaanb/ghc,anton-dessiatov/ghc,sdiehl/ghc,nkaretnikov/ghc,vTurbine/ghc,mfine/ghc,ekmett/ghc,TomMD/ghc,oldmanmike/ghc,hferreiro/replay,ghc-android/ghc,acowley/ghc,jstolarek/ghc,holzensp/ghc,holzensp/ghc,GaloisInc/halvm-ghc,da-x/ghc,forked-upstream-packages-for-ghcjs/ghc,forked-upstream-packages-for-ghcjs/ghc,sgillespie/ghc,acowley/ghc,elieux/ghc,fmthoma/ghc