[quant] Remove reference representation rewrite for adaptive_avg_pool2d (#108924)
Summary:
integer adaptive_avg_pool2d is not well defined due to different possible ways of rounding fp32 value to integer value, and
this op isn't too critical for numerics (since it appears not too often), so we'll skip this for now.
we might need to revert the changes that adds integer impl for adaptive_avg_pool op as well
Test Plan:
python test/test_quantization.py TestQuantizePT2ERepresentation
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/108924
Approved by: https://github.com/kimishpatel
