[quant][pt2] Add test for inplace add (#102867)
Summary: This was broken after the recent partitioner refactors.
Test Plan: python test/test_quantization.py TestQuantizePT2E.test_qat_inplace_add_relu
Differential Revision: D46402378
Pull Request resolved: https://github.com/pytorch/pytorch/pull/102867
Approved by: https://github.com/jerryzh168
