[clang][ssaf][docs] Document the Summary Extraction pipeline (#172876) This patch adds some documentation about the design of the Scalable Static Analysis Framework (SSAF) Summary Extraction part. This mainly focuses on how the custom FrontendAction would load different analyses (their extraction part), and the different formats it should export into. Each FrontendAction call would process a single TU by extracting summaries from them and serializing the results into a file in the desired format. The details are not polished yet, but I think it's still beneficial to have some guidance on how the upcoming components would fit together, hence this document. I'll come back to this document to keep it up-to-date as we proceed with the upstreaming.
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