[quant][fx] store dtype, axis as literals in the graph (#54624)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54624
previously we were creating setattr nodes for dtype and axis.
The FX convention is that primitive types are embedded as literals in args/kwargs.
With this change we won't see getattr nodes in the graph anymore for dtype/axis
Test Plan:
python test/test_quantization.py TestQuantizeFx
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D27306898
fbshipit-source-id: a7c91c7cb21ee96015c7f8830b38d943ada65358
