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diff --git a/clang/include/clang/Basic/AddressSpaces.h b/clang/include/clang/Basic/AddressSpaces.h
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+++ b/clang/include/clang/Basic/AddressSpaces.h
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+//===--- AddressSpaces.h - Language-specific address spaces -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file provides definitions for the various language-specific address
+//  spaces.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_ADDRESSSPACES_H
+#define LLVM_CLANG_BASIC_ADDRESSSPACES_H
+
+namespace clang {
+
+namespace LangAS {
+
+/// This enum defines the set of possible language-specific address spaces.
+/// It uses a high starting offset so as not to conflict with any address
+/// space used by a target.
+enum ID {
+  Offset = 0xFFFF00,
+
+  opencl_global = Offset,
+  opencl_local,
+  opencl_constant,
+
+  Last,
+  Count = Last-Offset
+};
+
+/// The type of a lookup table which maps from language-specific address spaces
+/// to target-specific ones.
+typedef unsigned Map[Count];
+
+}
+
+}
+
+#endif