[clang] Clang ssaf driver 4 (PR #231999)

[Petr Hosek via cfe-commits]

petrhosek wrote:

I'd second reverting the entire stack. While I personally know @jkorous-apple and I don't have any concern over malicious intent, these changes violate several layering principles, e.g. making GNU Make a mandatory dependency for lit tests and introducing dependency from clang on clang-tools-extra and libc++.  As a consequence, these changes broke a number of upstream and downstream builders which remain broken after more than a day and I don't see any straightforward way to fix these forward in a reasonable timeframe.

https://github.com/llvm/llvm-project/pull/231999