diff --git a/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp b/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
--- a/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
+++ b/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
@@ -159,6 +159,7 @@
         Function::Create(EmptyFT, GlobalValue::ExternalLinkage,
                          F.getAddressSpace(), "", &M);
     NewF->setVisibility(F.getVisibility());
+    NewF->setUnnamedAddr(F.getUnnamedAddr());
     NewF->takeName(&F);
     F.replaceAllUsesWith(ConstantExpr::getBitCast(NewF, F.getType()));
     F.eraseFromParent();