updates

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13521 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
typo in comment

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13522 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
do not test stack overflow on architectures that do not support it

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13523 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
remove redundant definition of dump_scheduling

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13524 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02