[clang][ssaf] Add the TUSummaryExtractorRegistry (#173290) This patch adds the TUSummaryExtractorRegistry for plugging in custom summary extractors. This also adds a fake TUSummaryBuilder to observe the side effects of inserting into the registry. The original TUSummaryBuilder class will be used to create EntityIDs and to map those to summary "facts" in the shape of "TUSummaryData" objects, but that part is not yet upstreamed. The important point is that TUSummaryBuilders have a use beyond just testing. --------- Co-authored-by: Jan Korous <jkorous@apple.com>
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