Asking for Sendable conformances on this path is going to lead to
a traversal of the stored properties of the type. If there is an
interface type computation ongoing, as is very likely the case, this
traversal can wind up causing a cycle when it forces the interface type
of a member once again.
Request only the non-structural conformances to break the cycle.
rdar://77189542
When referencing a function that is on a global actor, e.g.,
@MainActor func doSomething() -> Int
the result of that reference is a global-actor-qualified function type, e.g.,
@MainActor () -> Int
Part of rdar://76030136.
