[mlir] NFC: void visitRegionSuccessors

Author: makslevental

mlir/include/mlir/Analysis/DataFlow/SparseAnalysis.h

@@ -255,10 +255,10 @@ class AbstractSparseForwardDataFlowAnalysis : public DataFlowAnalysis {
   /// operation `branch`, which can either be the entry block of one of the
   /// regions or the parent operation itself, and set either the argument or
   /// parent result lattices.
-  void visitRegionSuccessors(ProgramPoint *point,
-                             RegionBranchOpInterface branch,
-                             RegionBranchPoint successor,
-                             ArrayRef<AbstractSparseLattice *> lattices);
+  virtual void
+  visitRegionSuccessors(ProgramPoint *point, RegionBranchOpInterface branch,
+                        RegionBranchPoint successor,
+                        ArrayRef<AbstractSparseLattice *> lattices);
 };
 
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