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

[Balázs Benics via cfe-commits]

steakhal wrote:

Given that they are in PST, I'll take this over from them and push a revert of the full stack.
@nikic @petrhosek We will figure out a way to ensure that moving forward we wouldn't interrupt the community.

Revert PR: https://github.com/llvm/llvm-project/pull/232274
I plan to merge the revert stack without formal approval - to not block on any of you.
I'll merge it as soon as the pre-merge checks are green on it.

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