[LifetimeDependenceMutableAccessors] defensive feature flag #80831
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glessard
requested review from
a team,
hborla,
slavapestov,
xedin and
DougGregor
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Adds a feature flag for mutable getters that return non-escapable results.
The feature flag introduced here is intended to guard mutating accessors that return non-escapable types, because this combination crashes an older version of the compiler as it parses the swiftinterface file.
Addresses rdar://149227278