Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBContext.h b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBContext.h
new file mode 100644
index 0000000..0ce49f5
--- /dev/null
+++ b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBContext.h
@@ -0,0 +1,65 @@
+//===-- PDBContext.h --------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===/
+
+#ifndef LLVM_DEBUGINFO_PDB_PDBCONTEXT_H
+#define LLVM_DEBUGINFO_PDB_PDBCONTEXT_H
+
+#include "llvm/DebugInfo/DIContext.h"
+#include "llvm/DebugInfo/PDB/IPDBSession.h"
+#include <cstdint>
+#include <memory>
+#include <string>
+
+namespace llvm {
+
+namespace object {
+class COFFObjectFile;
+} // end namespace object
+
+namespace pdb {
+
+  /// PDBContext
+  /// This data structure is the top level entity that deals with PDB debug
+  /// information parsing.  This data structure exists only when there is a
+  /// need for a transparent interface to different debug information formats
+  /// (e.g. PDB and DWARF).  More control and power over the debug information
+  /// access can be had by using the PDB interfaces directly.
+  class PDBContext : public DIContext {
+  public:
+    PDBContext(const object::COFFObjectFile &Object,
+               std::unique_ptr<IPDBSession> PDBSession);
+    PDBContext(PDBContext &) = delete;
+    PDBContext &operator=(PDBContext &) = delete;
+
+    static bool classof(const DIContext *DICtx) {
+      return DICtx->getKind() == CK_PDB;
+    }
+
+    void dump(raw_ostream &OS, DIDumpOptions DIDumpOpts) override;
+
+    DILineInfo getLineInfoForAddress(
+        uint64_t Address,
+        DILineInfoSpecifier Specifier = DILineInfoSpecifier()) override;
+    DILineInfoTable getLineInfoForAddressRange(
+        uint64_t Address, uint64_t Size,
+        DILineInfoSpecifier Specifier = DILineInfoSpecifier()) override;
+    DIInliningInfo getInliningInfoForAddress(
+        uint64_t Address,
+        DILineInfoSpecifier Specifier = DILineInfoSpecifier()) override;
+
+  private:
+    std::string getFunctionName(uint64_t Address, DINameKind NameKind) const;
+    std::unique_ptr<IPDBSession> Session;
+  };
+
+} // end namespace pdb
+
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_PDBCONTEXT_H