When there is an IfNode in the model, it will raise `if is not supported`
errror. I saw the error comes from `src/relay/backend/graph_plan_memory.cc`:
```c++
void VisitExpr_(const IfNode* op) final {
LOG(FATAL) << "if is not supported.";
}
```
Also in `src/relay/backend/graph_runtime_codegen.cc`:
```c++
std::vector<GraphNodeRef> VisitExpr_(const IfNode* op) override {
throw std::invalid_argument("if not supported");
return {};
}
```
Is it possible to implement these for IfNode? Any ideas are appreciated. Thanks.
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