Allan Shortlidge d062489344 SILGen: Don't reference external property descriptors for @backDeployed properties. ...

The property descriptors of `@backDeployed` properties aren't available on OSes
prior to the "back deployed before" OS version, so the descriptors cannot be
referenced by clients that may run against older versions of the library
that defines the property.

See https://github.com/apple/swift/pull/59214 for prior art.

Resolves rdar://106517386

2023-08-16 23:19:15 -07:00

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