Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/ObjectYAML/CodeViewYAMLDebugSections.h b/linux-x64/clang/include/llvm/ObjectYAML/CodeViewYAMLDebugSections.h
new file mode 100644
index 0000000..d620008
--- /dev/null
+++ b/linux-x64/clang/include/llvm/ObjectYAML/CodeViewYAMLDebugSections.h
@@ -0,0 +1,140 @@
+//=- CodeViewYAMLDebugSections.h - CodeView YAMLIO debug sections -*- 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 classes for handling the YAML representation of CodeView
+// Debug Info.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECTYAML_CODEVIEWYAMLDEBUGSECTIONS_H
+#define LLVM_OBJECTYAML_CODEVIEWYAMLDEBUGSECTIONS_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/DebugSubsection.h"
+#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/YAMLTraits.h"
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+namespace llvm {
+
+namespace codeview {
+
+class StringsAndChecksums;
+class StringsAndChecksumsRef;
+
+} // end namespace codeview
+
+namespace CodeViewYAML {
+
+namespace detail {
+
+struct YAMLSubsectionBase;
+
+} // end namespace detail
+
+struct YAMLFrameData {
+  uint32_t RvaStart;
+  uint32_t CodeSize;
+  uint32_t LocalSize;
+  uint32_t ParamsSize;
+  uint32_t MaxStackSize;
+  StringRef FrameFunc;
+  uint32_t PrologSize;
+  uint32_t SavedRegsSize;
+  uint32_t Flags;
+};
+
+struct YAMLCrossModuleImport {
+  StringRef ModuleName;
+  std::vector<uint32_t> ImportIds;
+};
+
+struct SourceLineEntry {
+  uint32_t Offset;
+  uint32_t LineStart;
+  uint32_t EndDelta;
+  bool IsStatement;
+};
+
+struct SourceColumnEntry {
+  uint16_t StartColumn;
+  uint16_t EndColumn;
+};
+
+struct SourceLineBlock {
+  StringRef FileName;
+  std::vector<SourceLineEntry> Lines;
+  std::vector<SourceColumnEntry> Columns;
+};
+
+struct HexFormattedString {
+  std::vector<uint8_t> Bytes;
+};
+
+struct SourceFileChecksumEntry {
+  StringRef FileName;
+  codeview::FileChecksumKind Kind;
+  HexFormattedString ChecksumBytes;
+};
+
+struct SourceLineInfo {
+  uint32_t RelocOffset;
+  uint32_t RelocSegment;
+  codeview::LineFlags Flags;
+  uint32_t CodeSize;
+  std::vector<SourceLineBlock> Blocks;
+};
+
+struct InlineeSite {
+  uint32_t Inlinee;
+  StringRef FileName;
+  uint32_t SourceLineNum;
+  std::vector<StringRef> ExtraFiles;
+};
+
+struct InlineeInfo {
+  bool HasExtraFiles;
+  std::vector<InlineeSite> Sites;
+};
+
+struct YAMLDebugSubsection {
+  static Expected<YAMLDebugSubsection>
+  fromCodeViewSubection(const codeview::StringsAndChecksumsRef &SC,
+                        const codeview::DebugSubsectionRecord &SS);
+
+  std::shared_ptr<detail::YAMLSubsectionBase> Subsection;
+};
+
+struct DebugSubsectionState {};
+
+Expected<std::vector<std::shared_ptr<codeview::DebugSubsection>>>
+toCodeViewSubsectionList(BumpPtrAllocator &Allocator,
+                         ArrayRef<YAMLDebugSubsection> Subsections,
+                         const codeview::StringsAndChecksums &SC);
+
+std::vector<YAMLDebugSubsection>
+fromDebugS(ArrayRef<uint8_t> Data, const codeview::StringsAndChecksumsRef &SC);
+
+void initializeStringsAndChecksums(ArrayRef<YAMLDebugSubsection> Sections,
+                                   codeview::StringsAndChecksums &SC);
+
+} // end namespace CodeViewYAML
+
+} // end namespace llvm
+
+LLVM_YAML_DECLARE_MAPPING_TRAITS(CodeViewYAML::YAMLDebugSubsection)
+
+LLVM_YAML_IS_SEQUENCE_VECTOR(CodeViewYAML::YAMLDebugSubsection)
+
+#endif // LLVM_OBJECTYAML_CODEVIEWYAMLDEBUGSECTIONS_H