#6577: fix performance of %L, %l, %n formats.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15319 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
#6577: fix performance of %S format.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15320 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
#6577: fix performance of %C format.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15321 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Changelog.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15322 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02