Add mandatory ScalarType nodes as input to the quant-dequant nodes. (#20468)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20468
ScalarType node is mandatory for activations and parameters now.
This change inserts ScalarType node for all the quant-dequant nodes. For the activations, currently the default value is at::ScalarType::Undefined. Remove this and explicitly pass the at::ScalarType::QUint8 dtype
Differential Revision: D15331600
fbshipit-source-id: 5b51e0b42e694bf409026af4783a12da6d7e234b
