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diff --git a/Source/JavaScriptCore/llint/LLIntPCRanges.h b/Source/JavaScriptCore/llint/LLIntPCRanges.h
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+++ b/Source/JavaScriptCore/llint/LLIntPCRanges.h
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+/*
+ * Copyright (C) 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. 
+ */
+
+#pragma once
+
+namespace JSC {
+
+namespace LLInt {
+
+// These are used just to denote where LLInt code begins and where it ends.
+extern "C" {
+    void llintPCRangeStart();
+    void llintPCRangeEnd();
+}
+
+ALWAYS_INLINE bool isLLIntPC(void* pc)
+{
+    uintptr_t pcAsInt = bitwise_cast<uintptr_t>(pc);
+    uintptr_t llintStart = bitwise_cast<uintptr_t>(llintPCRangeStart);
+    uintptr_t llintEnd = bitwise_cast<uintptr_t>(llintPCRangeEnd);
+    RELEASE_ASSERT(llintStart < llintEnd);
+    return llintStart <= pcAsInt && pcAsInt <= llintEnd;
+}
+
+#if ENABLE(JIT)
+static const GPRReg LLIntPC = GPRInfo::regT4;
+#endif
+
+} } // namespace JSC::LLInt