[clang] [analyzer] Model overflow builtins (PR #102602)

[Donát Nagy via cfe-commits]

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@@ -327,6 +327,8 @@ Static Analyzer
 New features
 ^^^^^^^^^^^^
 
+- Now CSA models `builtin_*_overflow` functions.
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NagyDonat wrote:

```suggestion
- Now CSA models `__builtin_*_overflow` functions.
```

https://github.com/llvm/llvm-project/pull/102602