[llvm] [mlir] [MLIR][OpenMP] Add MLIR Lowering Support for dist_schedule (PR #152736)

[Tom Eccles via llvm-commits]

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@@ -4783,13 +4843,18 @@ OpenMPIRBuilder::applyStaticChunkedWorkshareLoop(DebugLoc DL,
   Builder.SetCurrentDebugLocation(DL);
 
   // TODO: Detect overflow in ubsan or max-out with current tripcount.
-  Value *CastedChunkSize =
-      Builder.CreateZExtOrTrunc(ChunkSize, InternalIVTy, "chunksize");
+  Value *CastedChunkSize = Builder.CreateZExtOrTrunc(
+      ChunkSize ? ChunkSize : Zero, InternalIVTy, "chunksize");
+  Value *CastestDistScheduleChunkSize = Builder.CreateZExtOrTrunc(
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tblah wrote:

```suggestion
  Value *CastedDistScheduleChunkSize = Builder.CreateZExtOrTrunc(
```

https://github.com/llvm/llvm-project/pull/152736