[AST] Make IsNonUserModuleRequest consider SourceFile inputs as well.
#76456
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We're using a small custom frontend tool to generate indexstore data for
.swiftinterfacefiles in the SDKs. We do this by treating the.swiftinterfacefile as the input of an interface compilation, but this exits early because it treats it as aSourceFileinstead of an externalLoadedFile. This happens even if we callsetIsSystemModule(true)unless we skip setting the SDK path, but that causes other problems. It seems harmless to check forSourceFiles as well, so that a tool processing an SDK interface as a direct input still gets the right state.