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

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T-Gruber wrote:

Hello @steakhal, I have just looked through the changes again. What is the advantage of using checkPreCall instead of checkLocation? I would very much appreciate some background information. Thanks for your help!

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