[llvm] [Delinearization] Add function for fixed size array without relying on GEP (PR #145050)

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

Since there doesn't seem to be any objections and this patch doesn't change the behavior of existing passes, I'll go ahead and merge it for now.

https://github.com/llvm/llvm-project/pull/145050