[flang] [llvm] [flang][openmp] Adds Parser and Semantic Support for Interop Construct, and Init and Use Clauses. (PR #120584)

[Kiran Chandramohan via llvm-commits]

kiranchandramohan wrote:

Could you rebase to address the conflicts in `flang/lib/Parser/unparse.cpp`?

https://github.com/llvm/llvm-project/pull/120584