Avoid unnecessarily creating TypeReferences on import #25
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When importing a TypeSpecification, an element type or generic argument could be a TypeDefinition within the current module. When this happens, a new TypeReference does not need to be created. This can lead to a TypeReference being added to the typeref table for a type that is already in the assembly. This seems to hold together, although I don't think it's ideal. And really my goal is to avoid failing this logic in the ILLink test framework https://github.com/dotnet/runtime/blob/cec44d6dff9de95421f199f65bbc80b8296da1c0/src/tools/illink/test/Mono.Linker.Tests/TestCasesRunner/ResultChecker.cs#L56 This fix superceeds jbevain#138. I've left that fix in since that API is exposed publically and others could be depending on it. While I was adjusting this logic, I thought I would apply the same logic to a TypeReference where the scope is the current modules assembly. This case is a bit contrived as it shouldn't happen, but if it did, it would result in the same circular reference problem as jbevain#138
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Merging into our branch since there hasn't been any engagement on the upstream PR jbevain#970