Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolUsingNamespace.h b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolUsingNamespace.h
new file mode 100644
index 0000000..70fbd5b
--- /dev/null
+++ b/linux-x64/clang/include/llvm/DebugInfo/PDB/PDBSymbolUsingNamespace.h
@@ -0,0 +1,37 @@
+//===- PDBSymbolUsingNamespace.h - using namespace info ---------*- 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_PDBSYMBOLUSINGNAMESPACE_H
+#define LLVM_DEBUGINFO_PDB_PDBSYMBOLUSINGNAMESPACE_H
+
+#include "PDBSymbol.h"
+#include "PDBTypes.h"
+
+namespace llvm {
+
+class raw_ostream;
+namespace pdb {
+
+class PDBSymbolUsingNamespace : public PDBSymbol {
+public:
+ PDBSymbolUsingNamespace(const IPDBSession &PDBSession,
+ std::unique_ptr<IPDBRawSymbol> Symbol);
+
+ DECLARE_PDB_SYMBOL_CONCRETE_TYPE(PDB_SymType::UsingNamespace)
+
+ void dump(PDBSymDumper &Dumper) const override;
+
+ FORWARD_SYMBOL_ID_METHOD(getLexicalParent)
+ FORWARD_SYMBOL_METHOD(getName)
+};
+
+} // namespace llvm
+}
+
+#endif // LLVM_DEBUGINFO_PDB_PDBSYMBOLUSINGNAMESPACE_H