Revert "Don't generate forwarding hooks if all noSuchMethod implementations"

pkg/compiler/lib/src/enqueue.dart

Index: pkg/compiler/lib/src/enqueue.dart
diff --git a/pkg/compiler/lib/src/enqueue.dart b/pkg/compiler/lib/src/enqueue.dart
index adc2363c339717809225255e9c62132d680160fe..e00b7502307ec18991bc98417fd171974ca51c46 100644
--- a/pkg/compiler/lib/src/enqueue.dart
+++ b/pkg/compiler/lib/src/enqueue.dart
@@ -162,7 +162,7 @@ abstract class Enqueuer {
       FunctionElement function = member;
       function.computeSignature(compiler);
       if (function.name == Compiler.NO_SUCH_METHOD) {
-        registerNoSuchMethod(function);
+        enableNoSuchMethod(function);
       }
       if (function.name == Compiler.CALL_OPERATOR_NAME &&
           !cls.typeVariables.isEmpty) {
@@ -212,8 +212,7 @@ abstract class Enqueuer {
         .add(member);
   }
 
-  void registerNoSuchMethod(Element noSuchMethod);
-
+  void enableNoSuchMethod(Element element) {}
   void enableIsolateSupport() {}
 
   void processInstantiatedClass(ClassElement cls) {
@@ -737,15 +736,19 @@ class ResolutionEnqueuer extends Enqueuer {
     return true;
   }
 
-  void registerNoSuchMethod(Element element) {
-    compiler.backend.registerNoSuchMethod(element);
-  }
-
   void enableIsolateSupport() {
     compiler.hasIsolateSupport = true;
     compiler.backend.enableIsolateSupport(this);
   }
 
+  void enableNoSuchMethod(Element element) {
+    if (compiler.enabledNoSuchMethod) return;
+    if (compiler.backend.isDefaultNoSuchMethodImplementation(element)) return;
+
+    compiler.enabledNoSuchMethod = true;
+    compiler.backend.enableNoSuchMethod(element, this);
+  }
+
   /**
    * Adds an action to the deferred task queue.
    *
@@ -803,8 +806,6 @@ class CodegenEnqueuer extends Enqueuer {
 
   final Set<Selector> newlySeenSelectors;
 
-  bool enabledNoSuchMethod = false;
-
   CodegenEnqueuer(Compiler compiler,
                   ItemCompilationContext itemCompilationContextCreator())
       : queue = new Queue<CodegenWorkItem>(),
@@ -854,13 +855,6 @@ class CodegenEnqueuer extends Enqueuer {
     return true;
   }
 
-  void registerNoSuchMethod(Element element) {
-    if (!enabledNoSuchMethod && compiler.backend.enabledNoSuchMethod) {
-      compiler.backend.enableNoSuchMethod(this);
-      enabledNoSuchMethod = true;
-    }
-  }
-
   void _logSpecificSummary(log(message)) {
     log('Compiled ${generatedCode.length} methods.');
   }