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Add `Expr` support to the control-flow builders (#10400)

* Add `Expr` support to the control-flow builders

This is generally relatively straightforwards; anywhere where we examine
the resources used by an operation, we need to update to account for
classical resources potentially being tied up in `ControlFlowOp` fields
in `Expr` nodes as well.

This also has the side effect of fixing a bug where a nested
`SwitchCaseOp.target` wasn't considered in the scope building for _all_
control-flow operations, which could incorrectly cause some registers to
be missed in outer scopes.

* Remove out-of-date comment

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