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diff --git a/clang-r353983e/include/clang/Basic/LLVM.h b/clang-r353983e/include/clang/Basic/LLVM.h
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+//===--- LLVM.h - Import various common LLVM datatypes ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// Forward-declares and imports various common LLVM datatypes that
+/// clang wants to use unqualified.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_LLVM_H
+#define LLVM_CLANG_BASIC_LLVM_H
+
+// Do not proliferate #includes here, require clients to #include their
+// dependencies.
+// Casting.h has complex templates that cannot be easily forward declared.
+#include "llvm/Support/Casting.h"
+// None.h includes an enumerator that is desired & cannot be forward declared
+// without a definition of NoneType.
+#include "llvm/ADT/None.h"
+
+namespace llvm {
+  // ADT's.
+  class StringRef;
+  class Twine;
+  class VersionTuple;
+  template<typename T> class ArrayRef;
+  template<typename T> class MutableArrayRef;
+  template<typename T> class OwningArrayRef;
+  template<unsigned InternalLen> class SmallString;
+  template<typename T, unsigned N> class SmallVector;
+  template<typename T> class SmallVectorImpl;
+  template<typename T> class Optional;
+  template <class T> class Expected;
+
+  template<typename T>
+  struct SaveAndRestore;
+
+  // Reference counting.
+  template <typename T> class IntrusiveRefCntPtr;
+  template <typename T> struct IntrusiveRefCntPtrInfo;
+  template <class Derived> class RefCountedBase;
+
+  class raw_ostream;
+  class raw_pwrite_stream;
+  // TODO: DenseMap, ...
+}
+
+
+namespace clang {
+  // Casting operators.
+  using llvm::isa;
+  using llvm::cast;
+  using llvm::dyn_cast;
+  using llvm::dyn_cast_or_null;
+  using llvm::cast_or_null;
+
+  // ADT's.
+  using llvm::ArrayRef;
+  using llvm::MutableArrayRef;
+  using llvm::None;
+  using llvm::Optional;
+  using llvm::OwningArrayRef;
+  using llvm::SaveAndRestore;
+  using llvm::SmallString;
+  using llvm::SmallVector;
+  using llvm::SmallVectorImpl;
+  using llvm::StringRef;
+  using llvm::Twine;
+  using llvm::VersionTuple;
+
+  // Error handling.
+  using llvm::Expected;
+
+  // Reference counting.
+  using llvm::IntrusiveRefCntPtr;
+  using llvm::IntrusiveRefCntPtrInfo;
+  using llvm::RefCountedBase;
+
+  using llvm::raw_ostream;
+  using llvm::raw_pwrite_stream;
+} // end namespace clang.
+
+#endif