remove dependency on compiler from resolution

pkg/compiler/lib/src/resolution/registry.dart

 // Copyright (c) 2014, 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 dart2js.resolution.registry;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show Backend, ForeignResolver, NativeRegistry;
 import '../common/resolution.dart'
-    show Feature, ListLiteralUse, MapLiteralUse, ResolutionImpact;
+    show Feature, ListLiteralUse, MapLiteralUse, ResolutionImpact, Target;
 import '../common/registry.dart' show Registry;
 import '../compiler.dart' show Compiler;
 import '../constants/expressions.dart';
 import '../dart_types.dart';
 import '../diagnostics/source_span.dart';
 import '../enqueue.dart' show ResolutionEnqueuer;
 import '../elements/elements.dart';
 import '../tree/tree.dart';
 import '../util/util.dart' show Setlet;
 import '../universe/call_structure.dart' show CallStructure;
@@ skipping 131 matching lines @@
     }
     return sb.toString();
   }
 }
 
 /// [ResolutionRegistry] collects all resolution information. It stores node
 /// related information in a [TreeElements] mapping and registers calls with
 /// [Backend], [World] and [Enqueuer].
 // TODO(johnniwinther): Split this into an interface and implementation class.
 class ResolutionRegistry extends Registry {
-  final Compiler compiler;
+  final Target target;
   final TreeElementMapping mapping;
   final _ResolutionWorldImpact worldImpact;
 
-  ResolutionRegistry(Compiler compiler, TreeElementMapping mapping)
-      : this.compiler = compiler,
-        this.mapping = mapping,
+  ResolutionRegistry(this.target, TreeElementMapping mapping)
+      : this.mapping = mapping,
         this.worldImpact =
             new _ResolutionWorldImpact(mapping.analyzedElement.toString());
 
   bool get isForResolution => true;
 
-  Backend get backend => compiler.backend;
-
   String toString() => 'ResolutionRegistry for ${mapping.analyzedElement}';
 
   //////////////////////////////////////////////////////////////////////////////
   //  Node-to-Element mapping functionality.
   //////////////////////////////////////////////////////////////////////////////
 
   /// Register [node] as the declaration of [element].
   void defineFunction(FunctionExpression node, FunctionElement element) {
     // TODO(sigurdm): Remove when not needed by the dart2dart backend.
     if (node.name != null) {
@@ skipping 170 matching lines @@
 
   void registerMapLiteral(Node node, InterfaceType type,
       {bool isConstant, bool isEmpty}) {
     setType(node, type);
     worldImpact.registerMapLiteral(
         new MapLiteralUse(type, isConstant: isConstant, isEmpty: isEmpty));
   }
 
   void registerForeignCall(Node node, Element element,
       CallStructure callStructure, ResolverVisitor visitor) {
-    var nativeData = backend.resolveForeignCall(node, element, callStructure,
+    var nativeData = target.resolveForeignCall(node, element, callStructure,
         new ForeignResolutionResolver(visitor, this));
     if (nativeData != null) {
       // Split impact from resolution result.
       mapping.registerNativeData(node, nativeData);
       worldImpact.registerNativeData(nativeData);
     }
   }
 
   void registerDynamicUse(DynamicUse dynamicUse) {
     worldImpact.registerDynamicUse(dynamicUse);
   }
 
   void registerFeature(Feature feature) {
     worldImpact.registerFeature(feature);
   }
 
   void registerConstSymbol(String name) {
     worldImpact.registerConstSymbolName(name);
   }
 
   void registerConstantLiteral(ConstantExpression constant) {
     worldImpact.registerConstantLiteral(constant);
   }
 
   ClassElement defaultSuperclass(ClassElement element) {
-    return backend.defaultSuperclass(element);
+    return target.defaultSuperclass(element);
   }
 
   void registerInstantiation(InterfaceType type) {
     worldImpact.registerTypeUse(new TypeUse.instantiation(type));
   }
 
   void registerSendStructure(Send node, SendStructure sendStructure) {
     mapping.setSendStructure(node, sendStructure);
   }
 
@@ skipping 26 matching lines @@
   @override
   void registerInstantiatedType(InterfaceType type) {
     registry.registerInstantiation(type);
   }
 
   @override
   DartType resolveTypeFromString(Node node, String typeName) {
     return visitor.resolveTypeFromString(node, typeName);
   }
 }