Add the 'crossGettersSetters' flag to ClassHierarchy.forEachOverridePair().

pkg/kernel/lib/class_hierarchy.dart

Index: pkg/kernel/lib/class_hierarchy.dart
diff --git a/pkg/kernel/lib/class_hierarchy.dart b/pkg/kernel/lib/class_hierarchy.dart
index 5adc277376332e79d9983bd31f733789ca3a4567..332c4de049593d5de56252cef705dfbc8446c603 100644
--- a/pkg/kernel/lib/class_hierarchy.dart
+++ b/pkg/kernel/lib/class_hierarchy.dart
@@ -116,7 +116,8 @@ abstract class ClassHierarchy {
   /// Getters and setters are overridden separately.  The [isSetter] callback
   /// parameter determines which type of access is being overridden.
   void forEachOverridePair(Class class_,
-      callback(Member declaredMember, Member interfaceMember, bool isSetter));
+      callback(Member declaredMember, Member interfaceMember, bool isSetter),
+      {bool crossGettersSetters: false});
 
   /// This method is invoked by the client after it changed the [classes], and
   /// some of the information that this hierarchy might have cached, is not
@@ -377,7 +378,8 @@ class ClosedWorldClassHierarchy implements ClassHierarchy {
 
   @override
   void forEachOverridePair(Class class_,
-      callback(Member declaredMember, Member interfaceMember, bool isSetter)) {
+      callback(Member declaredMember, Member interfaceMember, bool isSetter),
+      {bool crossGettersSetters: false}) {
     _ClassInfo info = _infoFor[class_];
     for (var supertype in class_.supers) {
       var superclass = supertype.classNode;
@@ -390,6 +392,10 @@ class ClosedWorldClassHierarchy implements ClassHierarchy {
           isSetter: true);
       _reportOverrides(info.declaredSetters, superSetters, callback,
           isSetter: true, onlyAbstract: true);
+      if (crossGettersSetters) {
+        _reportOverrides(info.declaredGettersAndCalls, superSetters, callback);
+        _reportOverrides(info.declaredSetters, superGetters, callback);
+      }
     }
     if (!class_.isAbstract) {
       // If a non-abstract class declares an abstract method M whose