Create Clang type sugar matching Carbon type names. #6103
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When creating a Clang type corresponding to a Carbon type, create a fake Clang typedef whose name matches the Carbon type's name so that Clang diagnostics name the type using the Carbon name. Clang will also produce an
aka
describing the corresponding C++ type.TODO: Figure out a way to effectively cache the typedefs and avoid computing a string representation and allocating a separate typedef declaration for every call argument before merging.