Revert D24232288: [fx] make sure args/kwargs are immutable
Test Plan: revert-hammer
Differential Revision:
D24232288 (https://github.com/pytorch/pytorch/commit/61df99b78effac5d36c0b9d3f9fdeff9639c0a54)
Original commit changeset: c95b1a73ae55
fbshipit-source-id: b910a6618f76ef64caead20e8207997317bc2f5e
