[clang] [analyzer] Fix crash in BasicValueFactory.cpp with __int128_t integers (PR #67212)

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vabridgers wrote:

> I support changes like this. However, I think we should prefer reusing existing test files to creating more and more new ones. That has one benefit to me, one can see multiple cases of the topic on one screen without jumping around to open multiple. But that's all. I don't think I'll participate in the review though. They are piling up already.

Thanks @steakhal, I'll look at including this test into an existing case. Best

https://github.com/llvm/llvm-project/pull/67212