diff --git a/llvm/lib/CodeGen/DwarfEHPrepare.cpp b/llvm/lib/CodeGen/DwarfEHPrepare.cpp
--- a/llvm/lib/CodeGen/DwarfEHPrepare.cpp
+++ b/llvm/lib/CodeGen/DwarfEHPrepare.cpp
@@ -235,6 +235,7 @@
     CI->setCallingConv(TLI->getLibcallCallingConv(RTLIB::UNWIND_RESUME));
 
     // We never expect _Unwind_Resume to return.
+    CI->setDoesNotReturn();
     new UnreachableInst(Ctx, UnwindBB);
     return true;
   }
@@ -260,6 +261,7 @@
   CI->setCallingConv(TLI->getLibcallCallingConv(RTLIB::UNWIND_RESUME));
 
   // We never expect _Unwind_Resume to return.
+  CI->setDoesNotReturn();
   new UnreachableInst(Ctx, UnwindBB);
   return true;
 }