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

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

I won't stop you, but I still don't think this is the preferable approach. At the very least, I believe this is not the intended use of the type information, and it could turn into technical debt like the GEP we faced in the past.

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