Parsing into dead code for distilgpt2_fp16

[CharlieL7]

I was working on fixing the Netron output for this model when I saw that the issue I was seeing comes from how MIGraphX parses this model into a lot of dead code. Many instructions have no output. Take a look at the netron output attached here.

distilgpt2_netron.json

These instructions will be removed by dead_code_elimination, but why are we even parsing into dead code?

[CharlieL7]

Here's the model in question
distilgpt2_1_fp16_gpu.json
Github doesn't allow onnx files to be shared here. So it's probably easier to get a copy of the ONNX protobuf on the shared NAS.