[reland][quant][graphmode] Add quantization support for aten::cat (#34346) (#35337)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/35337
Test Plan: python test/test_jit.py
Differential Revision: D20648201
Pulled By: jerryzh168
fbshipit-source-id: f6570c3ee2f48a9bc6373d2af873824ac2c8ef62
