Introduce "CommonElements"

pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart

 // Copyright (c) 2013, 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.
 
 library type_graph_inferrer;
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 349 matching lines @@
     return nonNullEmptyType;
   }
 
   bool isNull(TypeInformation type) {
     return type == nullType;
   }
 
   TypeInformation allocateList(
       TypeInformation type, ast.Node node, Element enclosing,
       [TypeInformation elementType, int length]) {
-    bool isTypedArray = compiler.typedDataClass != null &&
-        classWorld.isInstantiated(compiler.typedDataClass) &&
-        type.type.satisfies(compiler.typedDataClass, classWorld);
+    ClassElement typedDataClass = compiler.commonElements.typedDataClass;
+    bool isTypedArray = typedDataClass != null &&
+        classWorld.isInstantiated(typedDataClass) &&
+        type.type.satisfies(typedDataClass, classWorld);
     bool isConst = (type.type == compiler.typesTask.constListType);
     bool isFixed = (type.type == compiler.typesTask.fixedListType) ||
         isConst ||
         isTypedArray;
     bool isElementInferred = isConst || isTypedArray;
 
     int inferredLength = isFixed ? length : null;
     TypeMask elementTypeMask =
         isElementInferred ? elementType.type : dynamicType.type;
     ContainerTypeMask mask = new ContainerTypeMask(
@@ skipping 1049 matching lines @@
   bool isCalledOnce(Element element) {
     if (compiler.disableTypeInference) return false;
     MemberTypeInformation info = inferrer.types.getInferredTypeOf(element);
     return info.isCalledOnce();
   }
 
   void clear() {
     inferrer.clear();
   }
 }