[clang] [llvm] [clang][ssaf] Add the TUSummaryExtractorRegistry (PR #173290)

[Balázs Benics via cfe-commits]

steakhal wrote:

@Xazax-hun Could you please check out this branch and build it on linux to see if you could reproduce the CI failure?
No matter what I do, I can't reproduce the failure.

You should build the `ClangScalableAnalysisTests` target and run the `build/tools/clang/unittests/Analysis/Scalable/ClangScalableAnalysisTests` executable.

https://github.com/llvm/llvm-project/pull/173290