[clang] [clang][bytecode] Fix unknown size arrays crash in clang bytecode (PR #160015)

[Mariya Podchishchaeva via cfe-commits]

https://github.com/Fznamznon commented:

Hi, thank you for the fix, could you please add a test? I think a test using __builtin_strlen and a similar array would be appropriate. I think it can be similar to tests that reside in `clang/test/AST/ByteCode/builtin-functions.cpp`  test file.

https://github.com/llvm/llvm-project/pull/160015