[flang-commits] [flang] [flang][OpenMP] Simplify handling of UserReductionDetails a bit (PR #159944)

[Tom Eccles via flang-commits]

https://github.com/tblah approved this pull request.

I don't love that we have these member variables in OmpVisitor but this is a clear improvement to what was there before so LGTM. Thanks for the cleanup.

https://github.com/llvm/llvm-project/pull/159944