Revert D26094906: Add serialization logic for complex numbers
Test Plan: revert-hammer
Differential Revision:
D26094906 (https://github.com/pytorch/pytorch/commit/2de4ecd4ebc99d509b8f13ff12ed241c7433a0ad)
Original commit changeset: 7b2614f3ee4a
fbshipit-source-id: 6f32a9fc6bb2a904ca1a282bbc6b2df0aee50068
