Allan Shortlidge 4841bcffa1 ModuleInterface: Print imports with @preconcurrency in swiftinterface files. ...

When a module has been imported `@preconcurrency` in source, when it is printed
in a `swiftinterface` file it should be printed along with the attribute to
ensure that type checking of the module's public declarations behaves
consistently.

This fix is a little unsatisfying because it adds another a linear scan over
all imports in the source for each printed import. This should be improved, but
it can be done later.

Resolves rdar://136857313.

2025-09-15 17:33:13 -07:00

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