Reflecting commit 15006 on version/4.02:
Typo in destroyed_at_alloc and destroyed_at_c_call, D17 was incorrectly claimed to be preserved.


git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15007 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02