[llvm-branch-commits] [flang] release/21.x: [flang][OpenMP] Restore reduction processor behavior broken by #145837 (#150178) (PR #150196)

[Tom Eccles via llvm-branch-commits]

tblah wrote:

I support this bugfix being backported, but I think the [normal process](https://llvm.org/docs/GitHub.html#backporting-fixes-to-the-release-branches) is to set the milestone and instruct the bot to attempt a cherry-pick.

https://github.com/llvm/llvm-project/pull/150196