[quant][fx] Remove unused method from QuantizeHandler (#74408)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74408
Removed
* should_mark_output_quantized_from_input_quantized_status
* _maybe_get_last_node_only_observer
since they are used in the previous convert code, which arep no logner needed
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D34984301
fbshipit-source-id: 0c46126576bd4ef633f4de530d01364e68f7ed39
(cherry picked from commit d14d094c4de308f08181920cd0611ea1bc664605)
