fix regression in toplevel printing of lazy values

(fix from Leo White)

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15602 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
update Changes

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15603 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02