[FX] Fix create_arg for NamedTuple (#48986)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/48986
Test Plan: Imported from OSS
Reviewed By: zdevito
Differential Revision: D25387156
Pulled By: jamesr66a
fbshipit-source-id: 0d38c43e02088fb7afb671683c88b6e463fe7c76
