Fix PR#6240

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14299 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
new version of the patch, using module_type option, and allowing unpacking when no type created

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14302 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Perform constant optimizations for integer division and modulus on the C-- level.

This way we can avoid having to duplicate the same functionality for
every backend, and we may also benefit from other optimizations performed
during C-- generation.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14303 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Add proper casts.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14304 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Fix PR#6241

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14305 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
caml_backtrace_pos is a 32-bit integer under amd64.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14307 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02