[PT2][Quant] Update op names for decomposed quantized lib (#103251)
Summary:
Dynamo trace, via dynamo.export, with aten_graph, generates graph with nodes
whose target is an isntance of torch._ops.OpOverload. Quantization workflow
inserting quantize/dequantize ops which are sometimes instances of
torch._ops.OpOverload (quantize_per_tensor.tensor) while other times instances
of torch._ops.OpOverloadPacket (quantizer_per_tensor) is a bit inconsistent.
Also not sure if it is a valid exported model, if it has nodes with target
of type torch._ops.OpOverloadPacket.
Without op overload name attached to the 'target', it fails during executorch
tracing. Reason is that executorch tracing expects node's targets to be
instances of torch._ops.OpOverload and not torch._ops.OpOverloadPacket.
So for consistency and tracing reasons, fixing convert pass to insert ops which
are torch._ops.OpOverload
Test Plan: CI
Reviewed By: jerryzh168
Differential Revision: D46342822
Pull Request resolved: https://github.com/pytorch/pytorch/pull/103251
Approved by: https://github.com/andrewor14
