dart2js cps: Add a pass for eliminating bounds checks.

pkg/compiler/lib/src/js_backend/codegen/task.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.
 
 /// Generate code using the cps-based IR pipeline.
 library code_generator_task;
 
 import 'glue.dart';
 import 'codegen.dart';
 import 'unsugar.dart';
@@ skipping 169 matching lines @@
     TypePropagator typePropagator =
         new TypePropagator(compiler, typeSystem, this);
     applyCpsPass(typePropagator);
     dumpTypedIR(cpsNode, typePropagator);
     applyCpsPass(new RemoveRefinements());
     applyCpsPass(new ShrinkingReducer());
     applyCpsPass(new ScalarReplacer(compiler));
     applyCpsPass(new MutableVariableEliminator());
     applyCpsPass(new RedundantJoinEliminator());
     applyCpsPass(new RedundantPhiEliminator());
+    applyCpsPass(new BoundsChecker(typeSystem, compiler.world));
     applyCpsPass(new ShrinkingReducer());
     applyCpsPass(new LoopInvariantCodeMotion());
     applyCpsPass(new ShareInterceptors());
     applyCpsPass(new ShrinkingReducer());
 
     return cpsNode;
   }
 
   tree_ir.FunctionDefinition compileToTreeIR(cps.FunctionDefinition cpsNode) {
     tree_builder.Builder builder = new tree_builder.Builder(
@@ skipping 42 matching lines @@
     // TODO(sigurdm): Make a better list of tasks.
     return <CompilerTask>[irBuilderTask]..addAll(fallbackCompiler.tasks);
   }
 
   js.Node attachPosition(js.Node node, AstElement element) {
     return node.withSourceInformation(
         sourceInformationFactory.createBuilderForContext(element)
             .buildDeclaration(element));
   }
 }