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diff --git a/clang-r353983/include/llvm/IR/Comdat.h b/clang-r353983/include/llvm/IR/Comdat.h
new file mode 100644
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+++ b/clang-r353983/include/llvm/IR/Comdat.h
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+//===- llvm/IR/Comdat.h - Comdat definitions --------------------*- 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
+/// This file contains the declaration of the Comdat class, which represents a
+/// single COMDAT in LLVM.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_COMDAT_H
+#define LLVM_IR_COMDAT_H
+
+#include "llvm-c/Types.h"
+#include "llvm/Support/CBindingWrapping.h"
+
+namespace llvm {
+
+class raw_ostream;
+class StringRef;
+template <typename ValueTy> class StringMapEntry;
+
+// This is a Name X SelectionKind pair. The reason for having this be an
+// independent object instead of just adding the name and the SelectionKind
+// to a GlobalObject is that it is invalid to have two Comdats with the same
+// name but different SelectionKind. This structure makes that unrepresentable.
+class Comdat {
+public:
+  enum SelectionKind {
+    Any,          ///< The linker may choose any COMDAT.
+    ExactMatch,   ///< The data referenced by the COMDAT must be the same.
+    Largest,      ///< The linker will choose the largest COMDAT.
+    NoDuplicates, ///< No other Module may specify this COMDAT.
+    SameSize,     ///< The data referenced by the COMDAT must be the same size.
+  };
+
+  Comdat(const Comdat &) = delete;
+  Comdat(Comdat &&C);
+
+  SelectionKind getSelectionKind() const { return SK; }
+  void setSelectionKind(SelectionKind Val) { SK = Val; }
+  StringRef getName() const;
+  void print(raw_ostream &OS, bool IsForDebug = false) const;
+  void dump() const;
+
+private:
+  friend class Module;
+
+  Comdat();
+
+  // Points to the map in Module.
+  StringMapEntry<Comdat> *Name = nullptr;
+  SelectionKind SK = Any;
+};
+
+// Create wrappers for C Binding types (see CBindingWrapping.h).
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(Comdat, LLVMComdatRef)
+
+inline raw_ostream &operator<<(raw_ostream &OS, const Comdat &C) {
+  C.print(OS);
+  return OS;
+}
+
+} // end namespace llvm
+
+#endif // LLVM_IR_COMDAT_H