Updated to Clang 3.5a.

Change-Id: I8127eb568f674c2e72635b639a3295381fe8af82
diff --git a/lib/Index/CommentToXML.cpp b/lib/Index/CommentToXML.cpp
index 0a9619d..43c4232 100644
--- a/lib/Index/CommentToXML.cpp
+++ b/lib/Index/CommentToXML.cpp
@@ -9,8 +9,8 @@
 
 #include "clang/Index/CommentToXML.h"
 #include "SimpleFormatContext.h"
-#include "clang/AST/Attr.h"
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/Attr.h"
 #include "clang/AST/Comment.h"
 #include "clang/AST/CommentVisitor.h"
 #include "clang/Format/Format.h"