Add the `TimelessP (j ⤇ e)` instance.

theories/logrel/threadpool.v

@@ -46,6 +46,8 @@ Section definitionsS.
 
   Global Instance heapS_mapsto_timeless l q v : TimelessP (heapS_mapsto l q v).
   Proof. rewrite heapS_mapsto_eq. apply _. Qed.
+  Global Instance tpool_mapsto_timeless j e: TimelessP (tpool_mapsto j e).
+  Proof. rewrite tpool_mapsto_eq. apply _. Qed.
   Global Instance spec_ctx_persistent ρ : PersistentP (spec_ctx ρ).
   Proof. apply _. Qed.
 End definitionsS.