[quant][graphmode][fx] insert_observer_for_input_arg_of_observed_node (#47785)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/47785
Test Plan: Imported from OSS
Reviewed By: vkuzo
Differential Revision: D24900302
fbshipit-source-id: 61d6287c462898837aed85d5c3a48b6e47b4a41b
