Create msvs_large_pdb workaround.

data/win/large-pdb-shim.cc

Index: data/win/large-pdb-shim.cc
diff --git a/data/win/large-pdb-shim.cc b/data/win/large-pdb-shim.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8bca510815e0a6decd1cef57e2b8f1344cc08246
--- /dev/null
+++ b/data/win/large-pdb-shim.cc
@@ -0,0 +1,12 @@
+// Copyright (c) 2013 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This file is used to generate an empty .pdb -- with a 4KB pagesize -- that is
+// then used during the final link for modules that have large PDBs. Otherwise,
+// the linker will generate a pdb with a page size of 1KB, which imposes a limit
+// of 1GB on the .pdb. By generating an initial empty .pdb with the compiler
+// (rather than the linker), this limit is avoided. With this in place PDBs may
+// grow to 2GB.
+//
+// This file is referenced by the msvs_large_pdb mechanism in MSVSUtil.py.