py/obj: Merge getiter and iternext mp_obj_type_t slots.

The goal here is to remove a slot (making way to turn make_new into a slot)
as well as reduce code size by the ~40 references to mp_identity_getiter
and mp_stream_unbuffered_iter.

This introduces two new type flags:
- MP_TYPE_FLAG_ITER_IS_ITERNEXT: This means that the "iter" slot in the
  type is "iternext", and should use the identity getiter.
- MP_TYPE_FLAG_ITER_IS_CUSTOM: This means that the "iter" slot is a pointer
  to a mp_getiter_iternext_custom_t instance, which then defines both
  getiter and iternext.

And a third flag that is the OR of both, MP_TYPE_FLAG_ITER_IS_STREAM: This
means that the type should use the identity getiter, and
mp_stream_unbuffered_iter as iternext.

Finally, MP_TYPE_FLAG_ITER_IS_GETITER is defined as a no-op flag to give
the default case where "iter" is "getiter".

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/ports/unix/modusocket.c b/ports/unix/modusocket.c
index 21260f0b2..dfbf15cd3 100644
--- a/ports/unix/modusocket.c
+++ b/ports/unix/modusocket.c
@@ -522,8 +522,6 @@ MP_DEFINE_CONST_OBJ_TYPE(
     MP_TYPE_FLAG_NONE,
     socket_make_new,
     print, socket_print,
-    getiter, NULL,
-    iternext, NULL,
     protocol, &usocket_stream_p,
     locals_dict, &usocket_locals_dict
     );