Accept changes.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14049 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Porting pa_matches.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14050 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02