[flang] [llvm] [flang][OpenMP] Parse iterators, add to MAP clause, TODO for lowering (PR #113167)

[Mats Petersson via llvm-commits]

https://github.com/Leporacanthicus commented:

Overall looks good to me. I think this is good to go, modulo the minor comments from Kiran and me.

https://github.com/llvm/llvm-project/pull/113167