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diff --git a/contrib/llvm/tools/clang/lib/Frontend/ChainedIncludesSource.cpp b/contrib/llvm/tools/clang/lib/Frontend/ChainedIncludesSource.cpp
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--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Frontend/ChainedIncludesSource.cpp
@@ -0,0 +1,287 @@
+//===- ChainedIncludesSource.cpp - Chained PCHs in Memory -------*- 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 ChainedIncludesSource class, which converts headers
+//  to chained PCHs in memory, mainly used for testing.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Serialization/ASTReader.h"
+#include "clang/Serialization/ASTWriter.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+using namespace clang;
+
+namespace {
+class ChainedIncludesSource : public ExternalSemaSource {
+public:
+  virtual ~ChainedIncludesSource();
+
+  ExternalSemaSource &getFinalReader() const { return *FinalReader; }
+
+  std::vector<CompilerInstance *> CIs;
+  IntrusiveRefCntPtr<ExternalSemaSource> FinalReader;
+
+protected:
+  //===----------------------------------------------------------------------===//
+  // ExternalASTSource interface.
+  //===----------------------------------------------------------------------===//
+
+  Decl *GetExternalDecl(uint32_t ID) override;
+  Selector GetExternalSelector(uint32_t ID) override;
+  uint32_t GetNumExternalSelectors() override;
+  Stmt *GetExternalDeclStmt(uint64_t Offset) override;
+  CXXBaseSpecifier *GetExternalCXXBaseSpecifiers(uint64_t Offset) override;
+  bool FindExternalVisibleDeclsByName(const DeclContext *DC,
+                                      DeclarationName Name) override;
+  ExternalLoadResult
+  FindExternalLexicalDecls(const DeclContext *DC,
+                           bool (*isKindWeWant)(Decl::Kind),
+                           SmallVectorImpl<Decl *> &Result) override;
+  void CompleteType(TagDecl *Tag) override;
+  void CompleteType(ObjCInterfaceDecl *Class) override;
+  void StartedDeserializing() override;
+  void FinishedDeserializing() override;
+  void StartTranslationUnit(ASTConsumer *Consumer) override;
+  void PrintStats() override;
+
+  /// Return the amount of memory used by memory buffers, breaking down
+  /// by heap-backed versus mmap'ed memory.
+  void getMemoryBufferSizes(MemoryBufferSizes &sizes) const override;
+
+  //===----------------------------------------------------------------------===//
+  // ExternalSemaSource interface.
+  //===----------------------------------------------------------------------===//
+
+  void InitializeSema(Sema &S) override;
+  void ForgetSema() override;
+  void ReadMethodPool(Selector Sel) override;
+  bool LookupUnqualified(LookupResult &R, Scope *S) override;
+};
+}
+
+static ASTReader *
+createASTReader(CompilerInstance &CI, StringRef pchFile,
+                SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> &MemBufs,
+                SmallVectorImpl<std::string> &bufNames,
+                ASTDeserializationListener *deserialListener = nullptr) {
+  Preprocessor &PP = CI.getPreprocessor();
+  std::unique_ptr<ASTReader> Reader;
+  Reader.reset(new ASTReader(PP, CI.getASTContext(), /*isysroot=*/"",
+                             /*DisableValidation=*/true));
+  for (unsigned ti = 0; ti < bufNames.size(); ++ti) {
+    StringRef sr(bufNames[ti]);
+    Reader->addInMemoryBuffer(sr, std::move(MemBufs[ti]));
+  }
+  Reader->setDeserializationListener(deserialListener);
+  switch (Reader->ReadAST(pchFile, serialization::MK_PCH, SourceLocation(),
+                          ASTReader::ARR_None)) {
+  case ASTReader::Success:
+    // Set the predefines buffer as suggested by the PCH reader.
+    PP.setPredefines(Reader->getSuggestedPredefines());
+    return Reader.release();
+
+  case ASTReader::Failure:
+  case ASTReader::Missing:
+  case ASTReader::OutOfDate:
+  case ASTReader::VersionMismatch:
+  case ASTReader::ConfigurationMismatch:
+  case ASTReader::HadErrors:
+    break;
+  }
+  return nullptr;
+}
+
+ChainedIncludesSource::~ChainedIncludesSource() {
+  for (unsigned i = 0, e = CIs.size(); i != e; ++i)
+    delete CIs[i];
+}
+
+IntrusiveRefCntPtr<ExternalSemaSource> clang::createChainedIncludesSource(
+    CompilerInstance &CI, IntrusiveRefCntPtr<ExternalSemaSource> &Reader) {
+
+  std::vector<std::string> &includes = CI.getPreprocessorOpts().ChainedIncludes;
+  assert(!includes.empty() && "No '-chain-include' in options!");
+
+  IntrusiveRefCntPtr<ChainedIncludesSource> source(new ChainedIncludesSource());
+  InputKind IK = CI.getFrontendOpts().Inputs[0].getKind();
+
+  SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> SerialBufs;
+  SmallVector<std::string, 4> serialBufNames;
+
+  for (unsigned i = 0, e = includes.size(); i != e; ++i) {
+    bool firstInclude = (i == 0);
+    std::unique_ptr<CompilerInvocation> CInvok;
+    CInvok.reset(new CompilerInvocation(CI.getInvocation()));
+    
+    CInvok->getPreprocessorOpts().ChainedIncludes.clear();
+    CInvok->getPreprocessorOpts().ImplicitPCHInclude.clear();
+    CInvok->getPreprocessorOpts().ImplicitPTHInclude.clear();
+    CInvok->getPreprocessorOpts().DisablePCHValidation = true;
+    CInvok->getPreprocessorOpts().Includes.clear();
+    CInvok->getPreprocessorOpts().MacroIncludes.clear();
+    CInvok->getPreprocessorOpts().Macros.clear();
+    
+    CInvok->getFrontendOpts().Inputs.clear();
+    FrontendInputFile InputFile(includes[i], IK);
+    CInvok->getFrontendOpts().Inputs.push_back(InputFile);
+
+    TextDiagnosticPrinter *DiagClient =
+      new TextDiagnosticPrinter(llvm::errs(), new DiagnosticOptions());
+    IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
+        new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(), DiagClient));
+
+    std::unique_ptr<CompilerInstance> Clang(new CompilerInstance());
+    Clang->setInvocation(CInvok.release());
+    Clang->setDiagnostics(Diags.get());
+    Clang->setTarget(TargetInfo::CreateTargetInfo(
+        Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
+    Clang->createFileManager();
+    Clang->createSourceManager(Clang->getFileManager());
+    Clang->createPreprocessor(TU_Prefix);
+    Clang->getDiagnosticClient().BeginSourceFile(Clang->getLangOpts(),
+                                                 &Clang->getPreprocessor());
+    Clang->createASTContext();
+
+    SmallVector<char, 256> serialAST;
+    llvm::raw_svector_ostream OS(serialAST);
+    auto consumer =
+        llvm::make_unique<PCHGenerator>(Clang->getPreprocessor(), "-", nullptr,
+                                        /*isysroot=*/"", &OS);
+    Clang->getASTContext().setASTMutationListener(
+                                            consumer->GetASTMutationListener());
+    Clang->setASTConsumer(std::move(consumer));
+    Clang->createSema(TU_Prefix, nullptr);
+
+    if (firstInclude) {
+      Preprocessor &PP = Clang->getPreprocessor();
+      PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
+                                             PP.getLangOpts());
+    } else {
+      assert(!SerialBufs.empty());
+      SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> Bufs;
+      // TODO: Pass through the existing MemoryBuffer instances instead of
+      // allocating new ones.
+      for (auto &SB : SerialBufs)
+        Bufs.push_back(llvm::MemoryBuffer::getMemBuffer(SB->getBuffer()));
+      std::string pchName = includes[i-1];
+      llvm::raw_string_ostream os(pchName);
+      os << ".pch" << i-1;
+      serialBufNames.push_back(os.str());
+
+      IntrusiveRefCntPtr<ASTReader> Reader;
+      Reader = createASTReader(
+          *Clang, pchName, Bufs, serialBufNames,
+          Clang->getASTConsumer().GetASTDeserializationListener());
+      if (!Reader)
+        return nullptr;
+      Clang->setModuleManager(Reader);
+      Clang->getASTContext().setExternalSource(Reader);
+    }
+    
+    if (!Clang->InitializeSourceManager(InputFile))
+      return nullptr;
+
+    ParseAST(Clang->getSema());
+    Clang->getDiagnosticClient().EndSourceFile();
+    SerialBufs.push_back(llvm::MemoryBuffer::getMemBufferCopy(OS.str()));
+    source->CIs.push_back(Clang.release());
+  }
+
+  assert(!SerialBufs.empty());
+  std::string pchName = includes.back() + ".pch-final";
+  serialBufNames.push_back(pchName);
+  Reader = createASTReader(CI, pchName, SerialBufs, serialBufNames);
+  if (!Reader)
+    return nullptr;
+
+  source->FinalReader = Reader;
+  return source;
+}
+
+//===----------------------------------------------------------------------===//
+// ExternalASTSource interface.
+//===----------------------------------------------------------------------===//
+
+Decl *ChainedIncludesSource::GetExternalDecl(uint32_t ID) {
+  return getFinalReader().GetExternalDecl(ID);
+}
+Selector ChainedIncludesSource::GetExternalSelector(uint32_t ID) {
+  return getFinalReader().GetExternalSelector(ID);
+}
+uint32_t ChainedIncludesSource::GetNumExternalSelectors() {
+  return getFinalReader().GetNumExternalSelectors();
+}
+Stmt *ChainedIncludesSource::GetExternalDeclStmt(uint64_t Offset) {
+  return getFinalReader().GetExternalDeclStmt(Offset);
+}
+CXXBaseSpecifier *
+ChainedIncludesSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
+  return getFinalReader().GetExternalCXXBaseSpecifiers(Offset);
+}
+bool
+ChainedIncludesSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
+                                                      DeclarationName Name) {
+  return getFinalReader().FindExternalVisibleDeclsByName(DC, Name);
+}
+ExternalLoadResult 
+ChainedIncludesSource::FindExternalLexicalDecls(const DeclContext *DC,
+                                      bool (*isKindWeWant)(Decl::Kind),
+                                      SmallVectorImpl<Decl*> &Result) {
+  return getFinalReader().FindExternalLexicalDecls(DC, isKindWeWant, Result);
+}
+void ChainedIncludesSource::CompleteType(TagDecl *Tag) {
+  return getFinalReader().CompleteType(Tag);
+}
+void ChainedIncludesSource::CompleteType(ObjCInterfaceDecl *Class) {
+  return getFinalReader().CompleteType(Class);
+}
+void ChainedIncludesSource::StartedDeserializing() {
+  return getFinalReader().StartedDeserializing();
+}
+void ChainedIncludesSource::FinishedDeserializing() {
+  return getFinalReader().FinishedDeserializing();
+}
+void ChainedIncludesSource::StartTranslationUnit(ASTConsumer *Consumer) {
+  return getFinalReader().StartTranslationUnit(Consumer);
+}
+void ChainedIncludesSource::PrintStats() {
+  return getFinalReader().PrintStats();
+}
+void ChainedIncludesSource::getMemoryBufferSizes(MemoryBufferSizes &sizes)const{
+  for (unsigned i = 0, e = CIs.size(); i != e; ++i) {
+    if (const ExternalASTSource *eSrc =
+        CIs[i]->getASTContext().getExternalSource()) {
+      eSrc->getMemoryBufferSizes(sizes);
+    }
+  }
+
+  getFinalReader().getMemoryBufferSizes(sizes);
+}
+
+void ChainedIncludesSource::InitializeSema(Sema &S) {
+  return getFinalReader().InitializeSema(S);
+}
+void ChainedIncludesSource::ForgetSema() {
+  return getFinalReader().ForgetSema();
+}
+void ChainedIncludesSource::ReadMethodPool(Selector Sel) {
+  getFinalReader().ReadMethodPool(Sel);
+}
+bool ChainedIncludesSource::LookupUnqualified(LookupResult &R, Scope *S) {
+  return getFinalReader().LookupUnqualified(R, S);
+}
+