[llvm] [mlir] [mlir][mesh] Add all-scatter operation (PR #81218)

[Lei Zhang via llvm-commits]

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@@ -590,6 +596,22 @@ static LogicalResult verifyScatterOperandAndResultShape(
   return success();
 }
 
+static RankedTensorType scatterResultType(Type operandType, MeshOp mesh,
+                                          ArrayRef<MeshAxis> meshAxes,
+                                          int64_t scatterAxis) {
+  RankedTensorType operandRankedTensorType =
+      operandType.cast<RankedTensorType>();
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antiagainst wrote:

This style of casting is deprecated? Prefer to use `cast<RankedTensorType>(operandType)`.

https://github.com/llvm/llvm-project/pull/81218