[Bug] ONNX-MLIR crashes on a model with Pad operator

[luyaor]

Description

When compiling following model with ONNX-MLIR, it crashes. But it could normally execute by onnxruntime.

The model with error is as follows, check bug3.onnx in o2m_bug3.zip.

Error Log

How to reproduce

Environment

Python3, with onnx, onnxruntime(optional)

1. Download o2m_bug3.zip

2. ./onnx-mlir bug3.onnx

or

• in o2m.py, replace the string as your onnx-mlir path
• Run python o2m.py.