Index: lib/Target/TargetLoweringObjectFile.cpp
===================================================================
--- lib/Target/TargetLoweringObjectFile.cpp
+++ lib/Target/TargetLoweringObjectFile.cpp
@@ -58,7 +58,7 @@
   const Constant *C = GV->getInitializer();
 
   // Must have zero initializer.
-  if (!C->isNullValue())
+  if (!C->isNullValue() && !isa<UndefValue>(C))
     return false;
 
   // Leave constant zeros in readonly constant sections, so they can be shared.