[llvm] [Delinearization] Remove tryDelinearizeFixedSizeImpl (PR #169046)

[Sebastian Pop via llvm-commits]

sebpop wrote:

> the matrix-multiplication pattern recognition relies on multi-dimensional accesses. Detecting the pattern with linearized accesses is not so easy.

I have fixed all Polly tests with reading the array info from global or alloca dimensions:
https://github.com/llvm/llvm-project/pull/156342

https://github.com/llvm/llvm-project/pull/169046