Make objcImpl classes derive inherited inits #63534
Merged
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A class that uses @objcImplementation but does not explicitly declare any designated initializers previously did not override the superclass initializers, so its stored properties would not be initialized. Opt these classes into that logic and adjust it to add the initializers to the @objcImplementation extension instead of the ClassDecl itself.
This PR also re-enables some tests on macOS that were disabled because they didn't work properly on other platforms.
Reviewers: I recommend reviewing commit-by-commit. The first two commits contain only test changes.
Fixes rdar://105008242.