Recognise debug_types.dwo as a debug info section

This is a preparatory patch to allow reading type units from dwo files.

llvm-svn: 363146
diff --git a/lldb/source/Symbol/ObjectFile.cpp b/lldb/source/Symbol/ObjectFile.cpp
index c1cf7e4..172d2b3 100644
--- a/lldb/source/Symbol/ObjectFile.cpp
+++ b/lldb/source/Symbol/ObjectFile.cpp
@@ -365,6 +365,7 @@
           case eSectionTypeDWARFDebugStrOffsets:
           case eSectionTypeDWARFDebugStrOffsetsDwo:
           case eSectionTypeDWARFDebugTypes:
+          case eSectionTypeDWARFDebugTypesDwo:
           case eSectionTypeDWARFAppleNames:
           case eSectionTypeDWARFAppleTypes:
           case eSectionTypeDWARFAppleNamespaces: