Metadata for Swift classes is missing on the first build with Xcode 10.2

[mbektchiev]

Environment

• CLI: next -> 6.0.0-2019-06-26-141203-13503
• Cross-platform modules: next -> 6.0.0-next-2019-06-26-125842-04
• iOS Runtime: next -> 6.0.0-2019-06-19-084246-01

Describe the bug
App crashes with JS ERROR ReferenceError Can't find variable SwiftClass file:... when 1st build it then run it (after adding Swift class).

To Reproduce

1. tns create TestApp --js
2. tns build ios
3. Add Swift class and use it
4. tns run ios

Expected behavior
App to work when Swift files are added

Sample project

Additional context
If you first add Swift files and run the app it works.