Rewrite for-in loop as indexing loop for JavaScript indexable arrays

pkg/compiler/lib/src/resolution/members.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 resolution;
 
 abstract class TreeElements {
   AnalyzableElement get analyzedElement;
   Iterable<Node> get superUses;
 
@@ skipping 3645 matching lines @@
     registry.registerDynamicInvocation(compiler.moveNextSelector);
 
     visit(node.expression);
 
     Scope blockScope = new BlockScope(scope);
     visitForInDeclaredIdentifierIn(node.declaredIdentifier, node, blockScope);
     visitLoopBodyIn(node, node.body, blockScope);
   }
 
   visitSyncForIn(SyncForIn node) {
+    registry.registerSyncForIn(node);
     registry.setIteratorSelector(node, compiler.iteratorSelector);
     registry.registerDynamicGetter(compiler.iteratorSelector);
     registry.setCurrentSelector(node, compiler.currentSelector);
     registry.registerDynamicGetter(compiler.currentSelector);
     registry.setMoveNextSelector(node, compiler.moveNextSelector);
     registry.registerDynamicInvocation(compiler.moveNextSelector);
 
     visit(node.expression);
 
     Scope blockScope = new BlockScope(scope);
@@ skipping 1470 matching lines @@
 }
 
 /// The result for the resolution of the `assert` method.
 class AssertResult implements ResolutionResult {
   const AssertResult();
 
   Element get element => null;
 
   String toString() => 'AssertResult()';
 }