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 add_equations_builtin_args_satisf: forall env rs ls arg arg' e e', add_equations_builtin_args env arg arg' e = Some e' -> satisf rs ls e' -> satisf rs ls e.