[flang] [llvm] [flang][OpenMP] Try to unify induction var privatization for OMP regions. (PR #91116)

[Leandro Lupori via llvm-commits]

https://github.com/luporl commented:

In addition to @kiranchandramohan's comments, I have a few more, but these changes are looking good to me now, thanks for working on this.

https://github.com/llvm/llvm-project/pull/91116