[mlir][transform] Fix typo in TrackingListener

This was an oversight in D147206. The function should not have been made
`const` (just like the other `notify...` functions).

Author: matthias-springer

mlir/include/mlir/Dialect/Transform/IR/TransformOps.h

@@ -54,7 +54,7 @@ class TrackingListener : public RewriterBase::Listener,
   /// replacement op was found. Derived classes can implement this function for
   /// custom error handling.
   virtual void notifyPayloadReplacementNotFound(Operation *op,
-                                                ValueRange values) const {}
+                                                ValueRange values) {}
 
   /// Return "true" if the given op is a new op.
   bool isNewOp(Operation *op) const;