fix: break inside async closure has incorrect span for enclosing closure

[linyihai]

Fixes #124496

[rustbot]

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[linyihai]

Pls look into fixing this in a more general way

Hope my latest submit general enough, I haven't see other code modules, such as the hir: : CoroutineKind: : Desugared

[linyihai]

@rustbot ready