[clang] [SSAF][Analyses] Add an AST visitor for the contribution model (PR #191933)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-linux-test-suite` running on `ppc64le-clang-test-suite` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/95/builds/20642

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
470.991 [1/4/1354] Linking CXX executable tools/clang/unittests/AllClangUnitTests
471.019 [1/3/1355] Linking CXX executable unittests/Transforms/Scalar/ScalarTests
471.026 [1/2/1356] Linking CXX executable unittests/CodeGen/GlobalISel/GlobalISelTests
471.848 [1/1/1357] cd /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/clang/bindings/python && /home/buildbots/llvm-external-buildbots/cmake-3.31.2/bin/cmake -E env CLANG_NO_DEFAULT_CONFIG=1 LIBCLANG_LIBRARY_PATH=/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/lib /home/buildbots/llvm-external-buildbots/workers/env/bin/python3.8 -m unittest discover
.....................................................................................................................................................................................
----------------------------------------------------------------------
Ran 181 tests in 442.151s

OK
471.849 [0/1/1357] Running all regression tests
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1673.062566

```

</details>

https://github.com/llvm/llvm-project/pull/191933