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diff --git a/clang-r353983/include/clang/AST/UnresolvedSet.h b/clang-r353983/include/clang/AST/UnresolvedSet.h
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+++ b/clang-r353983/include/clang/AST/UnresolvedSet.h
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+//===- UnresolvedSet.h - Unresolved sets of declarations --------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the UnresolvedSet class, which is used to store
+//  collections of declarations in the AST.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_UNRESOLVEDSET_H
+#define LLVM_CLANG_AST_UNRESOLVEDSET_H
+
+#include "clang/AST/DeclAccessPair.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/Specifiers.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/iterator.h"
+#include <cstddef>
+#include <iterator>
+
+namespace clang {
+
+class NamedDecl;
+
+/// The iterator over UnresolvedSets.  Serves as both the const and
+/// non-const iterator.
+class UnresolvedSetIterator : public llvm::iterator_adaptor_base<
+                                  UnresolvedSetIterator, DeclAccessPair *,
+                                  std::random_access_iterator_tag, NamedDecl *,
+                                  std::ptrdiff_t, NamedDecl *, NamedDecl *> {
+  friend class ASTUnresolvedSet;
+  friend class OverloadExpr;
+  friend class UnresolvedSetImpl;
+
+  explicit UnresolvedSetIterator(DeclAccessPair *Iter)
+      : iterator_adaptor_base(Iter) {}
+  explicit UnresolvedSetIterator(const DeclAccessPair *Iter)
+      : iterator_adaptor_base(const_cast<DeclAccessPair *>(Iter)) {}
+
+public:
+  // Work around a bug in MSVC 2013 where explicitly default constructed
+  // temporaries with defaulted ctors are not zero initialized.
+  UnresolvedSetIterator() : iterator_adaptor_base(nullptr) {}
+
+  NamedDecl *getDecl() const { return I->getDecl(); }
+  void setDecl(NamedDecl *ND) const { return I->setDecl(ND); }
+  AccessSpecifier getAccess() const { return I->getAccess(); }
+  void setAccess(AccessSpecifier AS) { I->setAccess(AS); }
+  const DeclAccessPair &getPair() const { return *I; }
+
+  NamedDecl *operator*() const { return getDecl(); }
+  NamedDecl *operator->() const { return **this; }
+};
+
+/// A set of unresolved declarations.
+class UnresolvedSetImpl {
+  using DeclsTy = SmallVectorImpl<DeclAccessPair>;
+
+  // Don't allow direct construction, and only permit subclassing by
+  // UnresolvedSet.
+private:
+  template <unsigned N> friend class UnresolvedSet;
+
+  UnresolvedSetImpl() = default;
+  UnresolvedSetImpl(const UnresolvedSetImpl &) = default;
+  UnresolvedSetImpl &operator=(const UnresolvedSetImpl &) = default;
+
+  // FIXME: Switch these to "= default" once MSVC supports generating move ops
+  UnresolvedSetImpl(UnresolvedSetImpl &&) {}
+  UnresolvedSetImpl &operator=(UnresolvedSetImpl &&) { return *this; }
+
+public:
+  // We don't currently support assignment through this iterator, so we might
+  // as well use the same implementation twice.
+  using iterator = UnresolvedSetIterator;
+  using const_iterator = UnresolvedSetIterator;
+
+  iterator begin() { return iterator(decls().begin()); }
+  iterator end() { return iterator(decls().end()); }
+
+  const_iterator begin() const { return const_iterator(decls().begin()); }
+  const_iterator end() const { return const_iterator(decls().end()); }
+
+  void addDecl(NamedDecl *D) {
+    addDecl(D, AS_none);
+  }
+
+  void addDecl(NamedDecl *D, AccessSpecifier AS) {
+    decls().push_back(DeclAccessPair::make(D, AS));
+  }
+
+  /// Replaces the given declaration with the new one, once.
+  ///
+  /// \return true if the set changed
+  bool replace(const NamedDecl* Old, NamedDecl *New) {
+    for (DeclsTy::iterator I = decls().begin(), E = decls().end(); I != E; ++I)
+      if (I->getDecl() == Old)
+        return (I->setDecl(New), true);
+    return false;
+  }
+
+  /// Replaces the declaration at the given iterator with the new one,
+  /// preserving the original access bits.
+  void replace(iterator I, NamedDecl *New) { I.I->setDecl(New); }
+
+  void replace(iterator I, NamedDecl *New, AccessSpecifier AS) {
+    I.I->set(New, AS);
+  }
+
+  void erase(unsigned I) { decls()[I] = decls().pop_back_val(); }
+
+  void erase(iterator I) { *I.I = decls().pop_back_val(); }
+
+  void setAccess(iterator I, AccessSpecifier AS) { I.I->setAccess(AS); }
+
+  void clear() { decls().clear(); }
+  void set_size(unsigned N) { decls().set_size(N); }
+
+  bool empty() const { return decls().empty(); }
+  unsigned size() const { return decls().size(); }
+
+  void append(iterator I, iterator E) { decls().append(I.I, E.I); }
+
+  DeclAccessPair &operator[](unsigned I) { return decls()[I]; }
+  const DeclAccessPair &operator[](unsigned I) const { return decls()[I]; }
+
+private:
+  // These work because the only permitted subclass is UnresolvedSetImpl
+
+  DeclsTy &decls() {
+    return *reinterpret_cast<DeclsTy*>(this);
+  }
+  const DeclsTy &decls() const {
+    return *reinterpret_cast<const DeclsTy*>(this);
+  }
+};
+
+/// A set of unresolved declarations.
+template <unsigned InlineCapacity> class UnresolvedSet :
+    public UnresolvedSetImpl {
+  SmallVector<DeclAccessPair, InlineCapacity> Decls;
+};
+
+
+} // namespace clang
+
+#endif // LLVM_CLANG_AST_UNRESOLVEDSET_H