[ORC] Fix missing std::move.

Should fix error in https://lab.llvm.org/buildbot/#/builders/84/builds/41540.

Author: lhames

llvm/lib/ExecutionEngine/Orc/EPCEHFrameRegistrar.cpp

@@ -28,7 +28,7 @@ EPCEHFrameRegistrar::Create(ExecutionSession &ES) {
             rt::RegisterEHFrameSectionWrapperName},
            {DeregisterEHFrameSectionWrapper,
             rt::DeregisterEHFrameSectionWrapperName}}))
-    return Err;
+    return std::move(Err);
 
   return std::make_unique<EPCEHFrameRegistrar>(
       ES, RegisterEHFrameSectionWrapper, DeregisterEHFrameSectionWrapper);