[llvm] [polly] [delinearize] Extract array dimensions from alloca and global declarations (PR #156342)

[Sebastian Pop via llvm-commits]

sebpop wrote:

> I've long wondered, why are you so particular about array type information? A delinearization function without relying on type information has already been landed (#145050). Isn't it insufficient?

Yes, it is insufficient.  Please see my ask to enable that code in all places where we call delinearize https://github.com/llvm/llvm-project/pull/145050#discussion_r2171207764

https://github.com/llvm/llvm-project/pull/156342