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.
c5e95af71d