Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolUnknown.h b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolUnknown.h
new file mode 100644
index 0000000..de43e47
--- /dev/null
+++ b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolUnknown.h
@@ -0,0 +1,36 @@
+//===- PDBSymbolUnknown.h - unknown symbol type -----------------*- 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_PDBSYMBOLUNKNOWN_H
+#define LLVM_DEBUGINFO_PDB_PDBSYMBOLUNKNOWN_H
+
+#include "PDBSymbol.h"
+
+namespace llvm {
+
+class raw_ostream;
+namespace pdb {
+
+class PDBSymbolUnknown : public PDBSymbol {
+public:
+ PDBSymbolUnknown(const IPDBSession &PDBSession,
+ std::unique_ptr<IPDBRawSymbol> UnknownSymbol);
+
+ void dump(PDBSymDumper &Dumper) const override;
+
+ static bool classof(const PDBSymbol *S) {
+ return (S->getSymTag() == PDB_SymType::None ||
+ S->getSymTag() >= PDB_SymType::Max);
+ }
+};
+
+} // namespace llvm
+}
+
+#endif // LLVM_DEBUGINFO_PDB_PDBSYMBOLUNKNOWN_H
