Revert D29190420: [nnc][tests] Tests and benchmarks for computeSum
Test Plan: revert-hammer
Differential Revision:
D29190420 (https://github.com/pytorch/pytorch/commit/21479ad20c9b9422f15b4a90a1a25ac4666a6e53)
Original commit changeset: 86246df82098
fbshipit-source-id: ed655497a981783da4c8f13e2d7fec104e3cb184
