Include llvm/Config/config.h in FileSystem.h as it depends upon HAVE_SYS_STAT_H which is defined (or not) in config.h. 
Include llvm/Config/config.h in FileSystem.h as it depends upon HAVE_SYS_STAT_H which is defined (or not) in config.h. 



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@250923 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm