AOT: Fix bug in receiver type propagation after unique selector calls.

runtime/vm/flow_graph.h

Index: runtime/vm/flow_graph.h
diff --git a/runtime/vm/flow_graph.h b/runtime/vm/flow_graph.h
index 8a1b5c6addef3bd4ade54bd3f9ea2a514be4b0c0..544dfacdfbb14677a45dc3e16c9dbbc2830feedd 100644
--- a/runtime/vm/flow_graph.h
+++ b/runtime/vm/flow_graph.h
@@ -285,6 +285,12 @@ class FlowGraph : public ZoneAllocated {
   // Merge instructions (only per basic-block).
   void TryOptimizePatterns();
 
+  // Replaces uses that are dominated by dom of 'def' with 'other'.
+  // Note: uses that occur at instruction dom itself are not dominated by it.
+  static void RenameDominatedUses(Definition* def,
+                                  Instruction* dom,
+                                  Definition* other);
+
  private:
   friend class IfConverter;
   friend class BranchSimplifier;