Sort #include lines for tools/...

Completely automated with sort_includes.py

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169240 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CXString.cpp b/tools/libclang/CXString.cpp
index bb09cd5..c4ab3f4 100644
--- a/tools/libclang/CXString.cpp
+++ b/tools/libclang/CXString.cpp
@@ -15,8 +15,8 @@
 
 #include "CXString.h"
 #include "CXTranslationUnit.h"
-#include "clang/Frontend/ASTUnit.h"
 #include "clang-c/Index.h"
+#include "clang/Frontend/ASTUnit.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/ErrorHandling.h"