Code autocompletion not working propertly in compiler directives

For example, I have code like this:

```swift
#if os(iOS)
let database = AppDatabaseManager.shared.getSharedDatabase()
#endif
```

The target of `AppDatabaseManager` is iOS, and the targets of this file are iOS and WatchOS, but insdie `#if os(iOS) ... #endif`，autocompletion of `AppDatabaseManager` does not work.

It works properly in XCode.
