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If the `LocalRef` is `LocalRef::Place`, we can refer to it directly, because the local of place is an indirect pointer. Such a statement is `_1 = &(_2.1)`. If the `LocalRef` is `LocalRef::Operand`, the `OperandRef` should provide the pointer of the reference. Such a statement is `_1 = &((*_2).1)`. But there is a special case that hasn't been handled, scalar pairs like `(&[i32; 16], i32)`.
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.