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

[Balazs Benics via cfe-commits]

steakhal wrote:

> @steakhal I wanted to wait for the pipeline to pass before merging. Shouldn't we only merge patches with a green pipeline?

The full pipeline will never be green. Downstream I wouldn't do this, but here I think we did what is reasonable. Waited enough. We can always revert with a single push of a button.


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