[Relay] Check if the attribute "name" exists before accessing it

[NicolaLancellotti]

I found that some models fail to compile with tvm when the target is: compute-library, llvm -mtriple=aarch64-linux-gnu -mattr=+v8.2a,+neon

The error is: AttributeError: <class 'tvm.ir.expr.GlobalVar'> has no attribute name.

This patch checks if the attribute name exists before accessing it, and solves the compilation issues that I had, producing the expected result during the following inference.

[tvm-bot]

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• cc @shingjan _{See #10317 for details}

_{Generated by tvm-bot}

[ekalda]

LGTM!

[ekalda]

Thanks @NicolaLancellotti!