[llvm] [DA] Replace delinearization for fixed size array (PR #161822)

[Michael Kruse via llvm-commits]

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

LGTM

Looking at the code, looks weirtd that we even have `delinearizeFixedSizeArray` and `tryDelinearizeFixedSizeImpl` which derive the same information, just using different heuristics. Should have been one functions that applies any heuristic that applies.

https://github.com/llvm/llvm-project/pull/161822