Index: llvm/trunk/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
===================================================================
--- llvm/trunk/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
+++ llvm/trunk/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
@@ -200,6 +200,7 @@
       continue;
 
     F.deleteBody();
+    F.setComdat(nullptr);
     F.clearMetadata();
   }
 
@@ -209,6 +210,7 @@
 
     GV.setInitializer(nullptr);
     GV.setLinkage(GlobalValue::ExternalLinkage);
+    GV.setComdat(nullptr);
     GV.clearMetadata();
   }
 
Index: llvm/trunk/test/Transforms/ThinLTOBitcodeWriter/split.ll
===================================================================
--- llvm/trunk/test/Transforms/ThinLTOBitcodeWriter/split.ll
+++ llvm/trunk/test/Transforms/ThinLTOBitcodeWriter/split.ll
@@ -12,9 +12,11 @@
 ; BCA0: <GLOBALVAL_SUMMARY_BLOCK
 ; BCA1-NOT: <GLOBALVAL_SUMMARY_BLOCK
 
+$g = comdat any
+
 ; M0: @g = external global i8{{$}}
-; M1: @g = global i8 42, !type !0
-@g = global i8 42, !type !0
+; M1: @g = global i8 42, comdat, !type !0
+@g = global i8 42, comdat, !type !0
 
 ; M0: define i8* @f()
 ; M1-NOT: @f()