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diff --git a/Source/JavaScriptCore/dfg/DFGPreciseLocalClobberize.h b/Source/JavaScriptCore/dfg/DFGPreciseLocalClobberize.h
deleted file mode 100644
index 3a7d716db..000000000
--- a/Source/JavaScriptCore/dfg/DFGPreciseLocalClobberize.h
+++ /dev/null
@@ -1,177 +0,0 @@
-/*
- * Copyright (C) 2014, 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 DFGPreciseLocalClobberize_h
-#define DFGPreciseLocalClobberize_h
-
-#if ENABLE(DFG_JIT)
-
-#include "DFGClobberize.h"
-#include "DFGMayExit.h"
-
-namespace JSC { namespace DFG {
-
-template<typename ReadFunctor, typename WriteFunctor, typename DefFunctor>
-class PreciseLocalClobberizeAdaptor {
-public:
-    PreciseLocalClobberizeAdaptor(
-        Graph& graph, Node* node,
-        const ReadFunctor& read, const WriteFunctor& write, const DefFunctor& def)
-        : m_graph(graph)
-        , m_node(node)
-        , m_read(read)
-        , m_unconditionalWrite(write)
-        , m_def(def)
-    {
-    }
-    
-    void read(AbstractHeap heap)
-    {
-        if (heap.kind() == Stack) {
-            if (heap.payload().isTop()) {
-                readTop();
-                return;
-            }
-            
-            callIfAppropriate(m_read, VirtualRegister(heap.payload().value32()));
-            return;
-        }
-        
-        if (heap.overlaps(Stack)) {
-            readTop();
-            return;
-        }
-    }
-    
-    void write(AbstractHeap heap)
-    {
-        // We expect stack writes to already be precisely characterized by DFG::clobberize().
-        if (heap.kind() == Stack) {
-            RELEASE_ASSERT(!heap.payload().isTop());
-            callIfAppropriate(m_unconditionalWrite, VirtualRegister(heap.payload().value32()));
-            return;
-        }
-        
-        RELEASE_ASSERT(!heap.overlaps(Stack));
-    }
-    
-    void def(PureValue)
-    {
-        // PureValue defs never have anything to do with locals, so ignore this.
-    }
-    
-    void def(HeapLocation location, LazyNode node)
-    {
-        if (location.kind() != StackLoc)
-            return;
-        
-        RELEASE_ASSERT(location.heap().kind() == Stack);
-        
-        m_def(VirtualRegister(location.heap().payload().value32()), node);
-    }
-    
-private:
-    template<typename Functor>
-    void callIfAppropriate(const Functor& functor, VirtualRegister operand)
-    {
-        if (operand.isLocal() && static_cast<unsigned>(operand.toLocal()) >= m_graph.block(0)->variablesAtHead.numberOfLocals())
-            return;
-        
-        if (operand.isArgument() && !operand.isHeader() && static_cast<unsigned>(operand.toArgument()) >= m_graph.block(0)->variablesAtHead.numberOfArguments())
-            return;
-        
-        functor(operand);
-    }
-    
-    void readTop()
-    {
-        switch (m_node->op()) {
-        case GetMyArgumentByVal:
-        case ForwardVarargs:
-        case CallForwardVarargs:
-        case ConstructForwardVarargs:
-        case TailCallForwardVarargs:
-        case TailCallForwardVarargsInlinedCaller: {
-            InlineCallFrame* inlineCallFrame = m_node->child1()->origin.semantic.inlineCallFrame;
-            if (!inlineCallFrame) {
-                // Read the outermost arguments and argument count.
-                for (unsigned i = m_graph.m_codeBlock->numParameters(); i-- > 1;)
-                    m_read(virtualRegisterForArgument(i));
-                m_read(VirtualRegister(JSStack::ArgumentCount));
-                break;
-            }
-            
-            for (unsigned i = inlineCallFrame->arguments.size(); i-- > 1;)
-                m_read(VirtualRegister(inlineCallFrame->stackOffset + virtualRegisterForArgument(i).offset()));
-            if (inlineCallFrame->isVarargs())
-                m_read(VirtualRegister(inlineCallFrame->stackOffset + JSStack::ArgumentCount));
-            break;
-        }
-            
-        default: {
-            // All of the outermost arguments, except this, are definitely read.
-            for (unsigned i = m_graph.m_codeBlock->numParameters(); i-- > 1;)
-                m_read(virtualRegisterForArgument(i));
-        
-            // The stack header is read.
-            for (unsigned i = 0; i < JSStack::ThisArgument; ++i)
-                m_read(VirtualRegister(i));
-        
-            // Read all of the inline arguments and call frame headers that we didn't already capture.
-            for (InlineCallFrame* inlineCallFrame = m_node->origin.semantic.inlineCallFrame; inlineCallFrame; inlineCallFrame = inlineCallFrame->getCallerInlineFrameSkippingTailCalls()) {
-                for (unsigned i = inlineCallFrame->arguments.size(); i-- > 1;)
-                    m_read(VirtualRegister(inlineCallFrame->stackOffset + virtualRegisterForArgument(i).offset()));
-                if (inlineCallFrame->isClosureCall)
-                    m_read(VirtualRegister(inlineCallFrame->stackOffset + JSStack::Callee));
-                if (inlineCallFrame->isVarargs())
-                    m_read(VirtualRegister(inlineCallFrame->stackOffset + JSStack::ArgumentCount));
-            }
-            break;
-        } }
-    }
-    
-    Graph& m_graph;
-    Node* m_node;
-    const ReadFunctor& m_read;
-    const WriteFunctor& m_unconditionalWrite;
-    const DefFunctor& m_def;
-};
-
-template<typename ReadFunctor, typename WriteFunctor, typename DefFunctor>
-void preciseLocalClobberize(
-    Graph& graph, Node* node,
-    const ReadFunctor& read, const WriteFunctor& write, const DefFunctor& def)
-{
-    PreciseLocalClobberizeAdaptor<ReadFunctor, WriteFunctor, DefFunctor>
-        adaptor(graph, node, read, write, def);
-    clobberize(graph, node, adaptor);
-}
-
-} } // namespace JSC::DFG
-
-#endif // ENABLE(DFG_JIT)
-
-#endif // DFGPreciseLocalClobberize_h
-