[BACKEND] Make sure getAxisBlockStride does not return 0 (#2273)

This can happen when the CTA shape is larger than the tensor shape along
the non-axis dim during scanOp lowering.

lib/Analysis/Utility.cpp

@@ -317,8 +317,9 @@ unsigned ScanLoweringHelper::getAxisBlockStride() {
   for (unsigned dim : order) {
     if (dim == getAxis())
       return stride;
-    stride *= type.getShape()[dim] /
-              (sizePerThreads[dim] * threadsPerWarp[dim] * warpsPerCTA[dim]);
+    stride *= ceil<unsigned int>(type.getShape()[dim], sizePerThreads[dim] *
+                                                           threadsPerWarp[dim] *
+                                                           warpsPerCTA[dim]);
   }
   llvm_unreachable("Axis not found in order");
 }