Index: llvm/trunk/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
===================================================================
--- llvm/trunk/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
+++ llvm/trunk/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
@@ -19,6 +19,7 @@
 #include "llvm/Analysis/TypeMetadataUtils.h"
 #include "llvm/Bitcode/BitcodeWriter.h"
 #include "llvm/IR/Constants.h"
+#include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/PassManager.h"
@@ -261,6 +262,7 @@
 
   ValueToValueMapTy VMap;
   std::unique_ptr<Module> MergedM(CloneModule(&M, VMap, IsInMergedM));
+  StripDebugInfo(*MergedM);
 
   filterModule(&M, [&](const GlobalValue *GV) { return !IsInMergedM(GV); });
 
Index: llvm/trunk/test/Transforms/ThinLTOBitcodeWriter/split.ll
===================================================================
--- llvm/trunk/test/Transforms/ThinLTOBitcodeWriter/split.ll
+++ llvm/trunk/test/Transforms/ThinLTOBitcodeWriter/split.ll
@@ -26,3 +26,10 @@
 
 ; M1: !0 = !{i32 0, !"typeid"}
 !0 = !{i32 0, !"typeid"}
+
+; M0: !llvm.dbg.cu
+; M1-NOT: !llvm.dbg.cu
+!llvm.dbg.cu = !{}
+
+!1 = !{i32 2, !"Debug Info Version", i32 3}
+!llvm.module.flags = !{!1}