Move include to the proper place. No functionality change

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111204 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Frontend/ASTUnit.h

@@ -25,7 +25,6 @@
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringSet.h"
 #include "llvm/System/Path.h"
 #include "llvm/Support/Timer.h"
 #include <map>

lib/Frontend/ASTUnit.cpp

@@ -32,6 +32,7 @@
 #include "clang/Basic/TargetOptions.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/Diagnostic.h"
+#include "llvm/ADT/StringSet.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/System/Host.h"
 #include "llvm/System/Path.h"