[clang] [llvm] [NFC][analyzer] Extract bounds checking library (PR #202372)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

I think a good name would reflect how this would be used, so I think something like:
```
struct BugReport {
  std::string FullDescription;
  std::string ShortDescription;
};
```

would make it very clear what this would be used for without any ambiguity. 

https://github.com/llvm/llvm-project/pull/202372