Revert D34647822: [tensorexpr] Add support for aten::stack
Test Plan: revert-hammer
Differential Revision:
D34647822 (https://github.com/pytorch/pytorch/commit/954c7e2a770f73377f753f9a80f60dfddc5b1da2)
Original commit changeset: 3b863c71886c
Original Phabricator Diff: D34647822 (https://github.com/pytorch/pytorch/commit/954c7e2a770f73377f753f9a80f60dfddc5b1da2)
fbshipit-source-id: e9ce06c9c8d7caf0fbb2565f0d99035bad685793
(cherry picked from commit b2ff355e9dbaa4e940fb221254223984c3c8a215)
