Specialize instance calls when the call receiver is the method receiver and the method class has a …

runtime/vm/cha.h

Index: runtime/vm/cha.h
diff --git a/runtime/vm/cha.h b/runtime/vm/cha.h
index fac6577bc26c9981178944a628ab0217ebbdaca9..a1ea229a2c3816122f2e49440e8e7fefb9fa9701 100644
--- a/runtime/vm/cha.h
+++ b/runtime/vm/cha.h
@@ -35,6 +35,11 @@ class CHA : public StackResource {
   static bool HasSubclasses(const Class& cls);
   bool HasSubclasses(intptr_t cid) const;
 
+  // Collect the concrete subclasses of 'cls' into 'class_ids'. Return true if
+  // the result is valid (may be invalid because we don't track the subclasses
+  // of classes allocated in the VM isolate or class Object).
+  bool ConcreteSubclasses(const Class& cls, GrowableArray<intptr_t> *class_ids);
+
   // Return true if the class is implemented by some other class.
   static bool IsImplemented(const Class& cls);