[QoL][Relax] Return well-formed IR from relax::Function::CreateEmpty #16861
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Prior to this commit, the static method
relax::Function::CreateEmpty
returned a function with a nullptr as the body. While only intended for use in bookkeeping for TVMScript, allowing nullptr in this location can cause unexpected segfaults while debugging. For example, adding a print statementThis commit updates the
relax::Function::CreateEmpty
function to contain a placeholder body, consistent with theret_struct_info
argument provided.