Support qadd_relu on pytorch mobile (#26982)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26982
Fused add+relu support
Test Plan:
python test/test_quantized.py TestQNNPackOps.test_qnnpack_add
Also,
Add torch.backends.quantized.engine = "qnnpack"
Ran
python test/test_quantized.py TestQuantizedOps.test_qadd_relu_different_qparams
python test/test_quantized.py TestQuantizedOps.test_qadd_relu_same_qparams
Imported from OSS
Differential Revision: D17635063
fbshipit-source-id: dd1cdf07f66c4cd657c1907f1b650e50d3d4725f
