add a test case for const fold (#65224)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65224
Add a test case for the fix D30996277 (https://github.com/pytorch/pytorch/commit/8c38d141df429459ea6891847950ce157ac82b2c).
Test Plan: buck test mode/opt -c python.package_style=inplace -c fbcode.nvcc_arch=v100,a100 -c fbcode.enable_gpu_sections=true -j 40 caffe2/test:fx_const_fold -- test_const_fold_module_attr
Reviewed By: jfix71
Differential Revision: D31000386
fbshipit-source-id: f444361839decc583bf93ac946cfe2049376719e
