Fix lifetime inference with older .swiftinterface files.
This was fix was accidentally not include in the previous commit,
which breaks older .swiftinterface files without it:
commit 75ba7a845c77fec3419ba4a4bb4dacfbf4d35e6c
Merge: befc15e6dff d41c4d4cc96
Author: Andrew Trick <atrick@apple.com>
Date: Wed Mar 19 18:22:35 2025
Merge pull request #80064 from atrick/lifetime-inference
LifetimeDependence: implement strict type checking
