[clang] Reapply "Reapply "[clang][ssaf] Add --ssaf-extract-summaries= and --ssaf-tu-summary-file= options"" (PR #185616)

[Balázs Benics via cfe-commits]

steakhal wrote:

The patch was already approved in the 1st attempt. I'll just merge this and see if it sticks.

https://github.com/llvm/llvm-project/pull/185616