Sort the #include lines for tools/...

Again, tools are trickier to pick the main module header for than
library source files. I've started to follow the pattern of using
LLVMContext.h when it is included as a stub for program source files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169252 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-ar/llvm-ar.cpp b/tools/llvm-ar/llvm-ar.cpp
index a8a5013..c66c89f 100644
--- a/tools/llvm-ar/llvm-ar.cpp
+++ b/tools/llvm-ar/llvm-ar.cpp
@@ -13,19 +13,19 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
 #include "llvm/Bitcode/Archive.h"
+#include "llvm/Module.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Format.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/PrettyStackTrace.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Signals.h"
+#include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cstdlib>
-#include <memory>
 #include <fstream>
+#include <memory>
 using namespace llvm;
 
 // Option for compatibility with AIX, not used but must allow it to be present.