[clang] [analyzer] Fix a crash from element region construction during `ArrayInitLoopExpr` analysis (PR #113570)

[Balazs Benics via cfe-commits]

https://github.com/steakhal approved this pull request.

Could you please add `no-crash` comment in the test code where we would have crashed?

Other than this, this looks good to me.
Thabks for the prompt fix!

https://github.com/llvm/llvm-project/pull/113570