Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolThunk.h b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolThunk.h
new file mode 100644
index 0000000..614fad8
--- /dev/null
+++ b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolThunk.h
@@ -0,0 +1,57 @@
+//===- PDBSymbolThunk.h - Support for querying PDB thunks ---------------*-===//
+//
+//                     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_PDBSYMBOLTHUNK_H
+#define LLVM_DEBUGINFO_PDB_PDBSYMBOLTHUNK_H
+
+#include "PDBSymbol.h"
+#include "PDBTypes.h"
+
+namespace llvm {
+
+class raw_ostream;
+namespace pdb {
+
+class PDBSymbolThunk : public PDBSymbol {
+public:
+  PDBSymbolThunk(const IPDBSession &PDBSession,
+                 std::unique_ptr<IPDBRawSymbol> ThunkSymbol);
+
+  DECLARE_PDB_SYMBOL_CONCRETE_TYPE(PDB_SymType::Thunk)
+
+  void dump(PDBSymDumper &Dumper) const override;
+
+  FORWARD_SYMBOL_METHOD(getAccess)
+  FORWARD_SYMBOL_METHOD(getAddressOffset)
+  FORWARD_SYMBOL_METHOD(getAddressSection)
+  FORWARD_SYMBOL_ID_METHOD(getClassParent)
+  FORWARD_SYMBOL_METHOD(isConstType)
+  FORWARD_SYMBOL_METHOD(isIntroVirtualFunction)
+  FORWARD_SYMBOL_METHOD(isStatic)
+  FORWARD_SYMBOL_METHOD(getLength)
+  FORWARD_SYMBOL_ID_METHOD(getLexicalParent)
+  FORWARD_SYMBOL_METHOD(getName)
+  FORWARD_SYMBOL_METHOD(isPureVirtual)
+  FORWARD_SYMBOL_METHOD(getRelativeVirtualAddress)
+  FORWARD_SYMBOL_METHOD(getTargetOffset)
+  FORWARD_SYMBOL_METHOD(getTargetRelativeVirtualAddress)
+  FORWARD_SYMBOL_METHOD(getTargetVirtualAddress)
+  FORWARD_SYMBOL_METHOD(getTargetSection)
+  FORWARD_SYMBOL_METHOD(getThunkOrdinal)
+  FORWARD_SYMBOL_ID_METHOD(getType)
+  FORWARD_SYMBOL_METHOD(isUnalignedType)
+  FORWARD_SYMBOL_METHOD(isVirtual)
+  FORWARD_SYMBOL_METHOD(getVirtualAddress)
+  FORWARD_SYMBOL_METHOD(getVirtualBaseOffset)
+  FORWARD_SYMBOL_METHOD(isVolatileType)
+};
+} // namespace llvm
+}
+
+#endif // LLVM_DEBUGINFO_PDB_PDBSYMBOLTHUNK_H