Create lib/DebugInfo/PDB.

This patch creates a platform-independent interface to a PDB reader.
There is currently no implementation of this interface, which will
be provided in future patches.  This defines the basic object model
which any implementation must conform to.

Reviewed by: David Blaikie
Differential Revision: http://reviews.llvm.org/D7356

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228428 91177308-0d34-0410-b5e6-96231b3b80d8

lib/DebugInfo/PDB/PDB.cpp

@@ -0,0 +1,21 @@
+//===- PDB.cpp - base header file for creating a PDB reader -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/StringRef.h"
+
+#include "llvm/DebugInfo/PDB/PDB.h"
+#include "llvm/DebugInfo/PDB/IPDBSession.h"
+
+using namespace llvm;
+
+std::unique_ptr<IPDBSession> llvm::createPDBReader(PDB_ReaderType Type,
+                                                   StringRef Path) {
+  // Create the correct concrete instance type based on the value of Type.
+  return nullptr;
+}