dart2js: Create noSuchMethod handlers at runtime to reduce overhead.

sdk/lib/_internal/compiler/implementation/js_backend/emitter_no_eval.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 js_backend;
 
 class CodeEmitterNoEvalTask extends CodeEmitterTask {
   CodeEmitterNoEvalTask(Compiler compiler,
                         Namer namer,
                         bool generateSourceMap)
       : super(compiler, namer, generateSourceMap);
 
   bool get getterAndSetterCanBeImplementedByFieldSpec => false;
+  bool get generateTrivialNsmHandlers => false;
 
   void emitSuper(String superName, ClassBuilder builder) {
     if (superName != '') {
       builder.addProperty('super', js.string(superName));
     }
   }
 
   void emitBoundClosureClassHeader(String mangledName,
                                    String superName,
                                    List<String> fieldNames,
@@ skipping 84 matching lines @@
     //
     // We also copy over old values like the prototype, and the
     // isolateProperties themselves.
     return js.fun('oldIsolate', [
       js['var isolateProperties = oldIsolate.${namer.isolatePropertiesName}'],
       new jsAst.FunctionDeclaration(
         new jsAst.VariableDeclaration('Isolate'),
           js.fun([], [
             js['var hasOwnProperty = Object.prototype.hasOwnProperty'],
             js.forIn('staticName', 'isolateProperties',
-              js.if_(js['hasOwnProperty.call(isolateProperties, staticName)'],
+              js.if_('hasOwnProperty.call(isolateProperties, staticName)',
                 js['this[staticName] = isolateProperties[staticName]'])),
             // Use the newly created object as prototype. In Chrome,
             // this creates a hidden class for the object and makes
             // sure it is fast to access.
             new jsAst.FunctionDeclaration(
               new jsAst.VariableDeclaration('ForceEfficientMap'),
               js.fun([], [])),
             js['ForceEfficientMap.prototype = this'],
             js['new ForceEfficientMap()']])),
       js['Isolate.prototype = oldIsolate.prototype'],
       js['Isolate.prototype.constructor = Isolate'],
       js['Isolate.${namer.isolatePropertiesName} = isolateProperties'],
       js.return_('Isolate')]);
   }
 }