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diff --git a/clang-r344140b/include/llvm/Transforms/Utils/SplitModule.h b/clang-r344140b/include/llvm/Transforms/Utils/SplitModule.h
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+++ b/clang-r344140b/include/llvm/Transforms/Utils/SplitModule.h
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+//===- SplitModule.h - Split a module into partitions -----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the function llvm::SplitModule, which splits a module
+// into multiple linkable partitions. It can be used to implement parallel code
+// generation for link-time optimization.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_SPLITMODULE_H
+#define LLVM_TRANSFORMS_UTILS_SPLITMODULE_H
+
+#include "llvm/ADT/STLExtras.h"
+#include <memory>
+
+namespace llvm {
+
+class Module;
+
+/// Splits the module M into N linkable partitions. The function ModuleCallback
+/// is called N times passing each individual partition as the MPart argument.
+///
+/// FIXME: This function does not deal with the somewhat subtle symbol
+/// visibility issues around module splitting, including (but not limited to):
+///
+/// - Internal symbols should not collide with symbols defined outside the
+///   module.
+/// - Internal symbols defined in module-level inline asm should be visible to
+///   each partition.
+void SplitModule(
+    std::unique_ptr<Module> M, unsigned N,
+    function_ref<void(std::unique_ptr<Module> MPart)> ModuleCallback,
+    bool PreserveLocals = false);
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_UTILS_SPLITMODULE_H