Remark val_lessdef_normalize:
forall v v' ty,
Val.has_type v ty -> Val.lessdef v v' ->
Val.lessdef v (Val.load_result (chunk_of_type ty) v').

Lemma in_subst_loc_part:
forall l1 l2 k q (e e': eqs),
EqSet.In q e ->
subst_loc_part l1 l2 k e = Some e' ->
(eloc q = l1 /\ ekind q = k /\ EqSet.In (Eq Full (ereg q) l2) e') \/ (Loc.diff l1 (eloc q) /\ EqSet.In q e').