[Kaleidoscope][BuildingAJIT] Add a missing std::move.

This should fix the build failure described in
https://github.com/llvm/llvm-project/issues/63.

examples/Kaleidoscope/BuildingAJIT/Chapter2/KaleidoscopeJIT.h

@@ -105,7 +105,7 @@ private:
         FPM->run(F);
     });
 
-    return TSM;
+    return std::move(TSM);
   }
 };