Merge CommonElements and BackendHelpers!

pkg/compiler/lib/src/ssa/value_range_analyzer.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.
 
 import '../constant_system_dart.dart';
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
-import '../js_backend/backend_helpers.dart';
 import '../world.dart' show ClosedWorld;
 import 'nodes.dart';
 import 'optimize.dart';
 
 class ValueRangeInfo {
   final ConstantSystem constantSystem;
 
   IntValue intZero;
   IntValue intOne;
 
@@ skipping 574 matching lines @@
    * save them here in order to remove them once the phase is done.
    */
   final List<HRangeConversion> conversions = <HRangeConversion>[];
 
   /**
    * Value ranges for integer instructions. This map gets populated by
    * the dominator tree visit.
    */
   final Map<HInstruction, Range> ranges = new Map<HInstruction, Range>();
 
-  final BackendHelpers backendHelpers;
   final ClosedWorld closedWorld;
   final ValueRangeInfo info;
   final SsaOptimizerTask optimizer;
 
   HGraph graph;
 
-  SsaValueRangeAnalyzer(
-      this.backendHelpers, ClosedWorld closedWorld, this.optimizer)
+  SsaValueRangeAnalyzer(ClosedWorld closedWorld, this.optimizer)
       : info = new ValueRangeInfo(closedWorld.constantSystem),
         this.closedWorld = closedWorld;
 
   ConstantSystem get constantSystem => closedWorld.constantSystem;
 
   void visitGraph(HGraph graph) {
     this.graph = graph;
     visitDominatorTree(graph);
     // We remove the range conversions after visiting the graph so
     // that the graph does not get polluted with these instructions
@@ skipping 482 matching lines @@
   }
 
   Range handleBinaryOperation(HBinaryArithmetic instruction) {
     Range leftRange = visit(instruction.left);
     Range rightRange = visit(instruction.right);
     if (leftRange == null || rightRange == null) return null;
     BinaryOperation operation = instruction.operation(info.constantSystem);
     return operation.apply(leftRange, rightRange);
   }
 }