Redo "Dummy receiver optimization"

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js.js_emitter;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 891 matching lines @@
       CodeBuffer buffer = bufferForConstant(constant, eagerBuffer);
       jsAst.Expression init = js(
           '${namer.globalObjectForConstant(constant)}.$name = #',
           constantInitializerExpression(constant));
       buffer.write(jsAst.prettyPrint(init, compiler));
       buffer.write('$N');
     }
   }
 
   bool isConstantInlinedOrAlreadyEmitted(Constant constant) {
-    if (constant.isFunction()) return true;   // Already emitted.
-    if (constant.isPrimitive()) return true;  // Inlined.
+    if (constant.isFunction()) return true;       // Already emitted.
+    if (constant.isPrimitive()) return true;      // Inlined.
+    if (constant.isDummyReceiver()) return true;  // Inlined.
     // The name is null when the constant is already a JS constant.
     // TODO(floitsch): every constant should be registered, so that we can
     // share the ones that take up too much space (like some strings).
     if (namer.constantName(constant) == null) return true;
     return false;
   }
 
   int compareConstants(Constant a, Constant b) {
     // Inlined constants don't affect the order and sometimes don't even have
     // names.
@@ skipping 673 matching lines @@
   }
 
   bool get areAnyElementsDeferred {
     return compiler.deferredLoadTask.areAnyElementsDeferred;
   }
 
   void registerReadTypeVariable(TypeVariableElement element) {
     readTypeVariables.add(element);
   }
 }