(* Build an [rmap] that's identical to [phi] except where [m] has stored. *)
Definition inflate_store: rmap.

Lemma adr_inv0: forall (b b': block) (ofs ofs': Z) (sz: Z), ~ adr_range (b, ofs) sz (b', ofs') -> b <> b' \/ ~ ofs <= ofs' < ofs + sz.