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

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

It would be best to consult an LLVM IR expert. I'm not an expert, but from my perspective, using the type arguments of allocas and/or global variables doesn't seem to significantly different from driving heuristics based on those of GEPs.

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