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

[Michael Kruse via llvm-commits]

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@@ -743,6 +767,35 @@ class OpenMPIRBuilder {
                       LoopBodyGenCallbackTy BodyGenCB, Value *TripCount,
                       const Twine &Name = "loop");
 
+  /// Generator for the control flow structure of an OpenMP canonical loops if
+  /// the parent directive has an `inscan` modifier specified.
+  /// If the `inscan` modifier is specified, the region of the parent is
+  /// expected to have a `scan` directive. Based on the clauses in
+  /// scan directive, the body of the loop is split into two loops: Input loop
+  /// and Scan Loop. Input loop contains the code generated for input phase of
+  /// scan and Scan loop contains the code generated for scan phase of scan.
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Meinersbur wrote:

Please also document on how it is to be used, i.g. that `createScan` is supposed to be called within the body callback.

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