Revert D28110359: [TensorExpr] Add `TensorExprKernel::runFast` method.
Test Plan: revert-hammer
Differential Revision:
D28110359 (https://github.com/pytorch/pytorch/commit/f219ed6627c0dc098bde966459f5afe3ba060078)
Original commit changeset: 4fdffc8196d2
fbshipit-source-id: 3c93a058b5dd7a3b71e399341a408ec74949ef56
