Decouple LocalsHandler from Compiler and JavaScriptBackend

pkg/compiler/lib/src/ssa/graph_builder.dart

 // Copyright (c) 2016, 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.
 
+import '../closure.dart';
 import '../common/codegen.dart' show CodegenRegistry;
 import '../common_elements.dart';
 import '../compiler.dart';
 import '../diagnostics/diagnostic_listener.dart';
 import '../elements/elements.dart';
 import '../elements/entities.dart' show Entity, Local;
 import '../elements/resolution_types.dart';
 import '../js_backend/js_backend.dart';
 import '../options.dart';
 import '../resolution/tree_elements.dart';
@@ skipping 35 matching lines @@
 
   DiagnosticReporter get reporter => backend.reporter;
 
   CompilerOptions get options => compiler.options;
 
   CommonElements get commonElements => closedWorld.commonElements;
 
   GlobalTypeInferenceResults get globalInferenceResults =>
       compiler.globalInference.results;
 
+  ClosureTask get closureToClassMapper => compiler.closureToClassMapper;
+
   /// Used to track the locals while building the graph.
   LocalsHandler localsHandler;
 
   /// A stack of instructions.
   ///
   /// We build the SSA graph by simulating a stack machine.
   List<HInstruction> stack = <HInstruction>[];
 
   /// The count of nested loops we are currently building.
   ///
@@ skipping 165 matching lines @@
     open(newBlock);
   }
 
   HInstruction callSetRuntimeTypeInfo(
       HInstruction typeInfo, HInstruction newObject);
 
   /// The element for which this SSA builder is being used.
   Element get targetElement;
   TypeBuilder get typeBuilder;
 }