Fix build: llvm::Error needs to be moved for implicit conversion to E…

…xpected.

I don't know why the premerge setup didn't fail on this, but many
builbots are broken right now.

llvm/include/llvm/ExecutionEngine/Orc/LLJIT.h

@@ -490,7 +490,7 @@ class LLJITBuilderSetters {
 
     if (impl().NotifyCreated)
       if (Error Err = impl().NotifyCreated(*J))
-        return Err;
+        return std::move(Err);
 
     return std::move(J);
   }