Consolidate source build argument handling
Consolidate source build argument handling

KevinRansom/roslyn,wvdd007/roslyn,jasonmalinowski/roslyn,eriawan/roslyn,CyrusNajmabadi/roslyn,AmadeusW/roslyn,CyrusNajmabadi/roslyn,shyamnamboodiripad/roslyn,sharwell/roslyn,AmadeusW/roslyn,CyrusNajmabadi/roslyn,AmadeusW/roslyn,mavasani/roslyn,shyamnamboodiripad/roslyn,KevinRansom/roslyn,mavasani/roslyn,jasonmalinowski/roslyn,mavasani/roslyn,wvdd007/roslyn,eriawan/roslyn,dotnet/roslyn,dotnet/roslyn,physhi/roslyn,physhi/roslyn,weltkante/roslyn,eriawan/roslyn,jasonmalinowski/roslyn,bartdesmet/roslyn,sharwell/roslyn,wvdd007/roslyn,dotnet/roslyn,bartdesmet/roslyn,shyamnamboodiripad/roslyn,KevinRansom/roslyn,diryboy/roslyn,diryboy/roslyn,weltkante/roslyn,physhi/roslyn,sharwell/roslyn,diryboy/roslyn,weltkante/roslyn,bartdesmet/roslyn