Optimize needNoSuchMethodHandling computation

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

Index: pkg/compiler/lib/src/elements/common.dart
diff --git a/pkg/compiler/lib/src/elements/common.dart b/pkg/compiler/lib/src/elements/common.dart
index 3e430d2ae90d3e38eb46b0d17060c285539de532..15bc49aaeec2ded0bbaab61a6215d3ce3db3c995 100644
--- a/pkg/compiler/lib/src/elements/common.dart
+++ b/pkg/compiler/lib/src/elements/common.dart
@@ -215,20 +215,22 @@ abstract class ClassElementCommon implements ClassElement {
    * When called on the implementation element both members declared in the
    * origin and the patch class are returned.
    */
-  Element lookupByName(Name memberName) {
-    return internalLookupByName(memberName, isSuperLookup: false);
+  Element lookupByName(Name memberName, {ClassElement stopAtSuperclass}) {
+    return internalLookupByName(memberName,
+        isSuperLookup: false, stopAtSuperclass: stopAtSuperclass);
   }
 
   Element lookupSuperByName(Name memberName) {
     return internalLookupByName(memberName, isSuperLookup: true);
   }
 
-  Element internalLookupByName(Name memberName, {bool isSuperLookup}) {
+  Element internalLookupByName(Name memberName,
+      {bool isSuperLookup, ClassElement stopAtSuperclass}) {
     String name = memberName.text;
     bool isPrivate = memberName.isPrivate;
     LibraryElement library = memberName.library;
     for (ClassElement current = isSuperLookup ? superclass : this;
-        current != null;
+        current != null && current != stopAtSuperclass;
         current = current.superclass) {
       Element member = current.lookupLocalMember(name);
       if (member == null && current.isPatched) {