[llvm] [LoopCacheAnalysis] Replace delinearization for fixed size array (PR #164798)

[Michael Kruse via llvm-commits]

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

LGTM

I had a first try removing getIndexExpressionsFromGEP from Polly, only updating tests so far.

https://github.com/llvm/llvm-project/pull/164798