Qiskit / qiskit-terra / 5600447200

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Add `Expr` support to `QuantumCircuit.compose` (#10375)

This relatively straightforwardly generalises the mapping of variables
that already exists in `QuantumCircuit.compose` to be able to handle
arbitrary `Expr` nodes as well.  We must take care not to accidentally
mutate the `Expr` nodes in the input circuit in the name of efficiency.

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