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

[Kiran Chandramohan via llvm-commits]

kiranchandramohan wrote:

Nice work @kparzysz 

@Leporacanthicus could you have a look at this patch? This patch also has an instance of a type in its syntax.

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