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diff --git a/Source/JavaScriptCore/bytecompiler/SetForScope.h b/Source/JavaScriptCore/bytecompiler/SetForScope.h
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+++ b/Source/JavaScriptCore/bytecompiler/SetForScope.h
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+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SetForScope_h
+#define SetForScope_h
+
+#include <wtf/StdLibExtras.h>
+
+namespace JSC {
+
+template<typename T>
+class SetForScope {
+public:
+    SetForScope(T& currentValue, const T& newValue)
+        : m_ref(currentValue)
+        , m_oldValue(currentValue)
+    {
+        m_ref = newValue;
+    }
+
+    SetForScope(T& currentValue, T&& newValue)
+        : m_ref(currentValue)
+        , m_oldValue(currentValue)
+    {
+        currentValue = WTFMove(newValue);
+    }
+
+    ~SetForScope()
+    {
+        m_ref = m_oldValue;
+    }
+
+private:
+    T& m_ref;
+    T m_oldValue;
+};
+
+}; // namespace JSC
+
+#endif // SetForScope_h