move functionalize fallback out of aten/core (#67564)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67564
moves the functionalize fallback out of aten/core and into aten, which should fix the issue described at https://fb.workplace.com/groups/163556484490704/permalink/1029416141238063/. I'm still not clear on why this didn't fail anything in CI / sandcastle on the initial diff: D31942093 (https://github.com/pytorch/pytorch/commit/0032fa772588cd20f2b85324bdeb31ac497bbf29)
ghstack-source-id: 141959891
Test Plan: Locally, running `buck build mode/opt //sigrid/feed/prediction_replayer:fully_remote_replayer_main`
Reviewed By: zou3519
Differential Revision: D32027585
fbshipit-source-id: 2d86c4a6b3a73b00ee0ccee2f89a54704ed83e00
