llvm-project

ef44a990 - [Modules] Enrich diags for out of date module dependencies (#190203)

[Modules] Enrich diags for out of date module dependencies (#190203) Replace the opaque `ErrorStr` parameter in `ModuleManager::addModule` with a structured object that carries specific information for reporting. This allows the diagnostics to emit targeted notes instead of a single error string appended to the main diagnostic. Information that is relevant but is tied to implementation details of the compilation is reported as notes (e.g. signature mismatches) This patch additionally * Adds minor comments to places I found unintuitive * Adds a contrived test case for signature mismatches * Sets `InputFilesValidation` based on module kind at construction