[clang] [llvm] Adapted MemRegion::getDescriptiveName to handle ElementRegions (PR #85104)

[Balazs Benics via cfe-commits]

steakhal wrote:

> Hi @steakhal, just to be sure. We are talking about a test case that covers that the index is "recognised" as a wrong variable (the matrix example above)?

Exactly!

https://github.com/llvm/llvm-project/pull/85104