[fx] improve args mutation error (#51175)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51175
gives a suggestion about how to deal with immutable args/kwargs list
Test Plan: Imported from OSS
Reviewed By: jamesr66a
Differential Revision: D26093478
Pulled By: zdevito
fbshipit-source-id: 832631c125561c3b343539e887c047f185060252
