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diff --git a/Source/JavaScriptCore/jit/Reg.h b/Source/JavaScriptCore/jit/Reg.h
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--- a/Source/JavaScriptCore/jit/Reg.h
+++ /dev/null
@@ -1,250 +0,0 @@
-/*
- * Copyright (C) 2014, 2016 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 Reg_h
-#define Reg_h
-
-#if ENABLE(JIT)
-
-#include "MacroAssembler.h"
-
-namespace JSC {
-
-// Reg is a polymorphic register class. It can refer to either integer or float registers.
-// Here are some use cases:
-//
-// GPRReg gpr;
-// Reg reg = gpr;
-// reg.isSet() == true
-// reg.isGPR() == true
-// reg.isFPR() == false
-//
-// for (Reg reg = Reg::first(); reg <= Reg::last(); reg = reg.next()) {
-//     if (reg.isGPR()) {
-//     } else /* reg.isFPR() */ {
-//     }
-// }
-//
-// The above loop could have also used !!reg or reg.isSet() as a condition.
-
-class Reg {
-public:
-    Reg()
-        : m_index(invalid())
-    {
-    }
-
-    Reg(WTF::HashTableDeletedValueType)
-        : m_index(deleted())
-    {
-    }
-    
-    Reg(MacroAssembler::RegisterID reg)
-        : m_index(MacroAssembler::registerIndex(reg))
-    {
-    }
-    
-    Reg(MacroAssembler::FPRegisterID reg)
-        : m_index(MacroAssembler::registerIndex(reg))
-    {
-    }
-    
-    static Reg fromIndex(unsigned index)
-    {
-        Reg result;
-        result.m_index = index;
-        return result;
-    }
-    
-    static Reg first()
-    {
-        Reg result;
-        result.m_index = 0;
-        return result;
-    }
-    
-    static Reg last()
-    {
-        Reg result;
-        result.m_index = MacroAssembler::numberOfRegisters() + MacroAssembler::numberOfFPRegisters() - 1;
-        return result;
-    }
-    
-    Reg next() const
-    {
-        ASSERT(!!*this);
-        if (*this == last())
-            return Reg();
-        Reg result;
-        result.m_index = m_index + 1;
-        return result;
-    }
-    
-    unsigned index() const { return m_index; }
-
-    static unsigned maxIndex()
-    {
-        return last().index();
-    }
-    
-    bool isSet() const { return m_index != invalid(); }
-    explicit operator bool() const { return isSet(); }
-
-    bool isHashTableDeletedValue() const { return m_index == deleted(); }
-    
-    bool isGPR() const
-    {
-        return m_index < MacroAssembler::numberOfRegisters();
-    }
-    
-    bool isFPR() const
-    {
-        return (m_index - MacroAssembler::numberOfRegisters()) < MacroAssembler::numberOfFPRegisters();
-    }
-    
-    MacroAssembler::RegisterID gpr() const
-    {
-        ASSERT(isGPR());
-        return static_cast<MacroAssembler::RegisterID>(MacroAssembler::firstRegister() + m_index);
-    }
-    
-    MacroAssembler::FPRegisterID fpr() const
-    {
-        ASSERT(isFPR());
-        return static_cast<MacroAssembler::FPRegisterID>(
-            MacroAssembler::firstFPRegister() + (m_index - MacroAssembler::numberOfRegisters()));
-    }
-    
-    bool operator==(const Reg& other) const
-    {
-        return m_index == other.m_index;
-    }
-    
-    bool operator!=(const Reg& other) const
-    {
-        return m_index != other.m_index;
-    }
-    
-    bool operator<(const Reg& other) const
-    {
-        return m_index < other.m_index;
-    }
-    
-    bool operator>(const Reg& other) const
-    {
-        return m_index > other.m_index;
-    }
-    
-    bool operator<=(const Reg& other) const
-    {
-        return m_index <= other.m_index;
-    }
-    
-    bool operator>=(const Reg& other) const
-    {
-        return m_index >= other.m_index;
-    }
-    
-    unsigned hash() const
-    {
-        return m_index;
-    }
-    
-    void dump(PrintStream&) const;
-
-    class AllRegsIterable {
-    public:
-
-        class iterator {
-        public:
-            iterator() { }
-
-            explicit iterator(Reg reg)
-                : m_regIndex(reg.index())
-            {
-            }
-
-            Reg operator*() const { return Reg::fromIndex(m_regIndex); }
-
-            iterator& operator++()
-            {
-                m_regIndex = Reg::fromIndex(m_regIndex).next().index();
-                return *this;
-            }
-
-            bool operator==(const iterator& other) const
-            {
-                return m_regIndex == other.m_regIndex;
-            }
-
-            bool operator!=(const iterator& other) const
-            {
-                return !(*this == other);
-            }
-
-        private:
-            unsigned m_regIndex;
-        };
-
-        iterator begin() const { return iterator(Reg::first()); }
-        iterator end() const { return iterator(Reg()); }
-    };
-
-    static AllRegsIterable all() { return AllRegsIterable(); }
-
-private:
-    static uint8_t invalid() { return 0xff; }
-
-    static uint8_t deleted() { return 0xfe; }
-    
-    uint8_t m_index;
-};
-
-struct RegHash {
-    static unsigned hash(const Reg& key) { return key.hash(); }
-    static bool equal(const Reg& a, const Reg& b) { return a == b; }
-    static const bool safeToCompareToEmptyOrDeleted = true;
-};
-
-} // namespace JSC
-
-namespace WTF {
-
-template<typename T> struct DefaultHash;
-template<> struct DefaultHash<JSC::Reg> {
-    typedef JSC::RegHash Hash;
-};
-
-template<typename T> struct HashTraits;
-template<> struct HashTraits<JSC::Reg> : SimpleClassHashTraits<JSC::Reg> {
-    static const bool emptyValueIsZero = false;
- };
-
-} // namespace WTF
-
-#endif // ENABLE(JIT)
-
-#endif // Reg_h
-