[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.

Still looks good.
I couldnt find the "no-crash" comments in the tests at the statements where they crashed but im fine without them too.

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