[clang] Reapply "[clang][ssaf] Add --ssaf-extract-summaries= and --ssaf-tu-summary-file= options" (PR #185414)

[Aiden Grossman via cfe-commits]

boomanaiden154 wrote:

This creates a layering violation. I've proposed #185429 to revert this so that the layering violation can be fixed.

https://github.com/llvm/llvm-project/pull/185414