[llvm] [OpenMP] [IR Builder] Changes to Support Scan Operation (PR #136035)

[Michael Kruse via llvm-commits]

https://github.com/Meinersbur commented:

Instead of relying on `createScan` to be called withing the `BodyGen` callback, have you considered `createCanonicalScanLoops` to receive two callbacks: one for the input phase, and another for the scan phase?

https://github.com/llvm/llvm-project/pull/136035