Make jit dicts ordered (#26465)
Summary:
Makes c10::Dict Ordered and bins binds the OrderedDict() and dict() constructor into torchscript. For the case of the empty constructor dict() i typed it as [str, Tensor] because:
• we're almost dropping support for python 2, at which point all dicts are ordered
• then it's more conventional to write x : Dict[int, int] = {} which is already supported
• It is possible to construct an arbitrarily typed empty OrderedDict through
OrderedDict(torch.jit.annotate(List[Tuple[key, value]], [])
We could consider dropping the no inputs aten::dict constructor since then the types would be more explicit.
This replaces https://github.com/pytorch/pytorch/issues/26170 and https://github.com/pytorch/pytorch/pull/26372 b/c ghstack was poisioned and i had to resubmit
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26465
Differential Revision: D17481604
Pulled By: eellison
fbshipit-source-id: d2d49795a518c3489881afac45d070e5262c5849
