Add missing file from r286566

Add the new BitcodeWriter.h header, which was missed in my r286566
commit, and should fix all the bot failures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286569 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Bitcode/BitcodeWriter.h

@@ -0,0 +1,53 @@
+//===-- llvm/Bitcode/BitcodeWriter.h - Bitcode writers ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header defines interfaces to write LLVM bitcode files/streams.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_BITCODE_BITCODEWRITER_H
+#define LLVM_BITCODE_BITCODEWRITER_H
+
+#include "llvm/IR/ModuleSummaryIndex.h"
+#include <string>
+
+namespace llvm {
+  class Module;
+  class raw_ostream;
+
+  /// \brief Write the specified module to the specified raw output stream.
+  ///
+  /// For streams where it matters, the given stream should be in "binary"
+  /// mode.
+  ///
+  /// If \c ShouldPreserveUseListOrder, encode the use-list order for each \a
+  /// Value in \c M.  These will be reconstructed exactly when \a M is
+  /// deserialized.
+  ///
+  /// If \c Index is supplied, the bitcode will contain the summary index
+  /// (currently for use in ThinLTO optimization).
+  ///
+  /// \p GenerateHash enables hashing the Module and including the hash in the
+  /// bitcode (currently for use in ThinLTO incremental build).
+  void WriteBitcodeToFile(const Module *M, raw_ostream &Out,
+                          bool ShouldPreserveUseListOrder = false,
+                          const ModuleSummaryIndex *Index = nullptr,
+                          bool GenerateHash = false);
+
+  /// Write the specified module summary index to the given raw output stream,
+  /// where it will be written in a new bitcode block. This is used when
+  /// writing the combined index file for ThinLTO. When writing a subset of the
+  /// index for a distributed backend, provide the \p ModuleToSummariesForIndex
+  /// map.
+  void WriteIndexToFile(const ModuleSummaryIndex &Index, raw_ostream &Out,
+                        const std::map<std::string, GVSummaryMapTy>
+                            *ModuleToSummariesForIndex = nullptr);
+} // End llvm namespace
+
+#endif