(* A stronger version of mem_wd2. Adapted from sepcomp/mem_wd2.v. *)
Definition mem_wd2 m := forall b ofs, memval_inject (Mem.flat_inj (Mem.nextblock m))
(ZMap.get ofs (PMap.get b (Mem.mem_contents m))) (ZMap.get ofs (PMap.get b (Mem.mem_contents m))).

Lemma mem_wd2_alloc: forall m b lo hi m' (ALL: Mem.alloc m lo hi = (m',b))
(WDm: mem_wd2 m), mem_wd2 m'.