Revert D25239967: [fx] Add matrix multiplication fusion pass
Test Plan: revert-hammer
Differential Revision:
D25239967 (https://github.com/pytorch/pytorch/commit/9b7f3fa146d350628b295ab9b794d64173f17da1)
Original commit changeset: fb99ad25b7d8
fbshipit-source-id: 370167b5ade8bf2b3a6cccdf4290ea07b8347c79
