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 no_caller_saves_sound:
forall e q,
no_caller_saves e = true ->
EqSet.In q e ->
callee_save_loc (eloc q).