Revert D28048289: [TensorExpr] Add methods for inspecting generated code in `TensorExprKernel`.
Test Plan: revert-hammer
Differential Revision:
D28048289 (https://github.com/pytorch/pytorch/commit/6b2cb939c54cc828ff5547fc212ab05513a7c57d)
Original commit changeset: 3867e862a0ec
fbshipit-source-id: bdd45dcc4b229673efeb06da411bbf0c58d44026
