yan zhou cd09f4b951 [CodeGen] This patch fix a bug that may caused error for a self-defined target in SelectionDAG::getNode (#75320) ...

we need first judge N1.getNumOperands() > 0.

If Lowering Generated SDNode like.

```
v2i32 t20:  TargetOpNode.
i32 t21: extract_vector_elt t20  0
i32 t22: extract_vector_elt t20 1
```

will cause a error.

2023-12-21 19:39:05 +07:00

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