Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/MC/MCWinCOFFStreamer.h b/linux-x64/clang/include/llvm/MC/MCWinCOFFStreamer.h
new file mode 100644
index 0000000..60c17ca
--- /dev/null
+++ b/linux-x64/clang/include/llvm/MC/MCWinCOFFStreamer.h
@@ -0,0 +1,81 @@
+//===- MCWinCOFFStreamer.h - COFF Object File Interface ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCWINCOFFSTREAMER_H
+#define LLVM_MC_MCWINCOFFSTREAMER_H
+
+#include "llvm/MC/MCDirectives.h"
+#include "llvm/MC/MCObjectStreamer.h"
+
+namespace llvm {
+
+class MCAsmBackend;
+class MCContext;
+class MCCodeEmitter;
+class MCInst;
+class MCSection;
+class MCSubtargetInfo;
+class MCSymbol;
+class StringRef;
+class raw_pwrite_stream;
+
+class MCWinCOFFStreamer : public MCObjectStreamer {
+public:
+  MCWinCOFFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
+                    std::unique_ptr<MCCodeEmitter> CE, raw_pwrite_stream &OS);
+
+  /// state management
+  void reset() override {
+    CurSymbol = nullptr;
+    MCObjectStreamer::reset();
+  }
+
+  /// \name MCStreamer interface
+  /// \{
+
+  void InitSections(bool NoExecStack) override;
+  void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
+  void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
+  void EmitThumbFunc(MCSymbol *Func) override;
+  bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
+  void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
+  void BeginCOFFSymbolDef(MCSymbol const *Symbol) override;
+  void EmitCOFFSymbolStorageClass(int StorageClass) override;
+  void EmitCOFFSymbolType(int Type) override;
+  void EndCOFFSymbolDef() override;
+  void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
+  void EmitCOFFSymbolIndex(MCSymbol const *Symbol) override;
+  void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
+  void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) override;
+  void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                        unsigned ByteAlignment) override;
+  void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                             unsigned ByteAlignment) override;
+  void EmitZerofill(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
+                    unsigned ByteAlignment) override;
+  void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
+                      unsigned ByteAlignment) override;
+  void EmitIdent(StringRef IdentString) override;
+  void EmitWinEHHandlerData(SMLoc Loc) override;
+  void FinishImpl() override;
+
+  /// \}
+
+protected:
+  const MCSymbol *CurSymbol;
+
+  void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override;
+
+private:
+  void Error(const Twine &Msg) const;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_MC_MCWINCOFFSTREAMER_H