Optimize needNoSuchMethodHandling computation

pkg/compiler/lib/src/elements/elements.dart

Index: pkg/compiler/lib/src/elements/elements.dart
diff --git a/pkg/compiler/lib/src/elements/elements.dart b/pkg/compiler/lib/src/elements/elements.dart
index 29e2396e84a6db5c33f0d4844f0e78e8423622e4..e854e4d17c07de57c311944412d782f0acef2206 100644
--- a/pkg/compiler/lib/src/elements/elements.dart
+++ b/pkg/compiler/lib/src/elements/elements.dart
@@ -1555,7 +1555,13 @@ abstract class ClassElement extends TypeDeclarationElement
   void reverseBackendMembers();
 
   Element lookupMember(String memberName);
-  Element lookupByName(Name memberName);
+
+  /// Looks up a class instance member declared or inherited in this class
+  /// using [memberName] to match the (private) name and getter/setter property.
+  ///
+  /// This method recursively visits superclasses until the member is found or
+  /// [stopAt] is reached.
+  Element lookupByName(Name memberName, {ClassElement stopAt});
   Element lookupSuperByName(Name memberName);
 
   Element lookupLocalMember(String memberName);