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

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vabridgers wrote:

@steakhal, I looked at the existing test cases, but cannot find an existing test where this case would easily fit. I'm happy to follow a specific suggestion about where or how to reformat or rename this test. 

For now, I'll assume this current approach is ok until I see some concrete suggestions. 

Thanks


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