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 subst_loc_undef_satisf: forall env src dst rs ls ml e e', subst_loc dst src e = Some e' -> well_typed_move env dst e = true -> can_undef_except dst ml e = true -> wt_regset env rs -> satisf rs ls e' -> satisf rs (Locmap.set dst (ls src) (undef_regs ml ls)) e.