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

[Ryotaro Kasuga via llvm-commits]

https://github.com/kasuga-fj commented:

I've not checked the details of this change, but I have a high-level question: Is it allowed to use the type information of `alloca`s and/or global variable to guide optimization heuristics? 

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