DWARFContext: Fix possible memory leak since r198908.

llvm-svn: 200000
diff --git a/llvm/lib/DebugInfo/DWARFContext.cpp b/llvm/lib/DebugInfo/DWARFContext.cpp
index b725619..3b73f7f 100644
--- a/llvm/lib/DebugInfo/DWARFContext.cpp
+++ b/llvm/lib/DebugInfo/DWARFContext.cpp
@@ -27,6 +27,7 @@
   DeleteContainerPointers(CUs);
   DeleteContainerPointers(TUs);
   DeleteContainerPointers(DWOCUs);
+  DeleteContainerPointers(DWOTUs);
 }
 
 static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data,