[flang] [llvm] [VPlan] Fix wrap-flags on WidenInduction unroll (PR #187710)

[Florian Hahn via llvm-commits]

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

Should be fine after a rebase on current `main`.

LGTM, thanks

https://github.com/llvm/llvm-project/pull/187710