Sort the #include lines for utils/...

I've tried to find main moudle headers where possible, but the TableGen
stuff may warrant someone else looking at it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169251 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/SetTheory.h b/utils/TableGen/SetTheory.h
index 122372a..5baed79 100644
--- a/utils/TableGen/SetTheory.h
+++ b/utils/TableGen/SetTheory.h
@@ -47,8 +47,8 @@
 #ifndef SETTHEORY_H
 #define SETTHEORY_H
 
-#include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/StringMap.h"
 #include "llvm/Support/SourceMgr.h"
 #include <map>
 #include <vector>