[PT2][Quant] Change quat conv bn fusion code (#103556)
Summary:
Dynamo burn in scalars instead of keeping them on module. This results in
quantize_per_tensor and dequantize_per_tensor nodes to have burnt in scale and
zero point value, if we trace them scalar.
Graph rewrite ignores literals and when match pattern is replaced with
replacement pattern, we lose the scale/zp and other values from nodes in
original graph and instead get one from replacement graph.
This diff fixes that for q/dq per tensor node by manually copying these values
over.
Note that this is not robust because it works only when there is only a single
q/dq node
Test Plan: quantization_pt2e
Reviewed By: andrewor14
Differential Revision: D46614000
Pull Request resolved: https://github.com/pytorch/pytorch/pull/103556
Approved by: https://github.com/andrewor14
