[quant][trt] Add support for torch.addmm in TensorRT (#67537)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67537
This PR adds support for quantizing torch.addmm to produce a reference quantized pattern,
and also adds support in the backend_config_dict api that allows people to specify the input, weight and bias input for each input:
```
addmm_config = {
"pattern": torch.addmm,
"observation_type": ObservationType.OUTPUT_USE_DIFFERENT_OBSERVER_AS_INPUT,
"dtype_configs": [
weighted_op_qint8_dtype_config,
],
# a map from input type to input index
"input_type_to_index": {
"bias": 0,
"input": 1,
"weight": 2,
}
}
```
This requires some changes in getting weight_dtype and bias_dtype in the type inference stage of prepare, which will be added in the previous PR
Test Plan:
```
pytho test/fx2trt/test_quant_trt.py TestQuantizeFxTRT.test_addmm
```
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D32014998
fbshipit-source-id: 8d96c1e8b7ebb2ab385c08a5b1e43f2d5a2cbcbe
