Some cleanup for libpdb.

This patch implements a few of the optional suggestions from the
initial patch comitting libpdb.  In particular, it implements a
virtual function out of line for each of the concrete classes.

A few other minor cleanups exist as well, such as using override
instead of virtual, etc.

llvm-svn: 228516
diff --git a/llvm/lib/DebugInfo/PDB/PDBSymbolPublicSymbol.cpp b/llvm/lib/DebugInfo/PDB/PDBSymbolPublicSymbol.cpp
new file mode 100644
index 0000000..147ac44
--- /dev/null
+++ b/llvm/lib/DebugInfo/PDB/PDBSymbolPublicSymbol.cpp
@@ -0,0 +1,21 @@
+//===- PDBSymbolPublicSymbol.cpp - ------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <utility>
+
+#include "llvm/DebugInfo/PDB/PDBSymbol.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolPublicSymbol.h"
+
+using namespace llvm;
+
+PDBSymbolPublicSymbol::PDBSymbolPublicSymbol(
+    std::unique_ptr<IPDBRawSymbol> Symbol)
+    : PDBSymbol(std::move(Symbol)) {}
+
+void PDBSymbolPublicSymbol::dump(llvm::raw_ostream &OS) const {}