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2edd32aa - [red-knot] `SemanticIndexBuilder` visits value before target in named expressions (#13053)

[red-knot] `SemanticIndexBuilder` visits value before target in named expressions (#13053) The `SemanticIndexBuilder` was causing a cycle in a salsa query by attempting to resolve the target before the value in a named expression (e.g. `x := x+1`). This PR swaps the order, avoiding a panic. Closes #13012.