[COFF] Expose the PE debug data directory and dump it

This directory is used to find if there is a PDB associated with an
executable. I plan to use this functionality to teach llvm-symbolizer
whether it should use DIA or DWARF to symbolize a given DLL.

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D20885

llvm-svn: 271539
diff --git a/llvm/lib/ObjectYAML/COFFYAML.cpp b/llvm/lib/ObjectYAML/COFFYAML.cpp
index f3a4f00..02ae053 100644
--- a/llvm/lib/ObjectYAML/COFFYAML.cpp
+++ b/llvm/lib/ObjectYAML/COFFYAML.cpp
@@ -397,7 +397,7 @@
   IO.mapOptional("CertificateTable", PH.DataDirectories[COFF::CERTIFICATE_TABLE]);
   IO.mapOptional("BaseRelocationTable",
                  PH.DataDirectories[COFF::BASE_RELOCATION_TABLE]);
-  IO.mapOptional("Debug", PH.DataDirectories[COFF::DEBUG]);
+  IO.mapOptional("Debug", PH.DataDirectories[COFF::DEBUG_DIRECTORY]);
   IO.mapOptional("Architecture", PH.DataDirectories[COFF::ARCHITECTURE]);
   IO.mapOptional("GlobalPtr", PH.DataDirectories[COFF::GLOBAL_PTR]);
   IO.mapOptional("TlsTable", PH.DataDirectories[COFF::TLS_TABLE]);