[clang] Revert "Reapply "[clang][ssaf] Add --ssaf-extract-summaries= and --ssaf-tu-summary-file= options"" (PR #185429)

[Balázs Benics via cfe-commits]

steakhal wrote:

This kind of suggests to me that if I want a new FrontendAction, then I must implement it in the `libFrontend` or at least as a new library similar to how the `clangRewriteFrontend` does, right?

https://github.com/llvm/llvm-project/pull/185429