Add non zero offset test cases for Quantize and Dequantize Ops. (#41693)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41693
Add non zero offset test cases for Quantize and Dequantize Ops.
Test Plan: Added new test case test_int8_non_zero_offset_quantize part of the test_int8_ops_nnpi.py test file.
Reviewed By: hyuen
Differential Revision: D22633796
fbshipit-source-id: be17ee7a0caa6e9bc7b175af539be2e6625ad47a
