Replace TypedStorage._storage with TypedStorage.untyped() (#221)

Summary:
As part of my PR pytorch/pytorch#85303, I'm renaming `TypedStorage._storage` to `TypedStorage._untyped_storage` for better clarity, and since MultiPy depends on the old name, a CI job is failing on my PR. There is a public function `TypedStorage.untyped()` which is probably better to use in this case, and doing so will fix the CI failure for me

cc ezyang

Pull Request resolved: #221

Reviewed By: priyaramani

Differential Revision: D41086182

Pulled By: PaliC

fbshipit-source-id: 494a05c51b2e9ce29724f9bfa2728eee26e43ff7

multipy/utils/_deploy.py

@@ -37,7 +37,7 @@ def persistent_id(obj):
             if isinstance(obj, STORAGE_TYPE):
                 # TODO: Once we decide to break serialization FC, we can
                 # remove this case
-                storage = obj._storage
+                storage = obj.untyped()
                 dtype = obj.dtype
             else:
                 storage = obj