Index: COFF/Driver.cpp
===================================================================
--- COFF/Driver.cpp
+++ COFF/Driver.cpp
@@ -80,6 +80,7 @@
   ObjFile::Instances.clear();
   ImportFile::Instances.clear();
   BitcodeFile::Instances.clear();
+  MergeChunk::Instances.clear();
   return !errorCount();
 }