Streamline the CPS IR Visitor interface.

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 146 matching lines @@
     }
 
     new RedundantPhiEliminator().rewrite(cpsNode);
     traceGraph("Redundant phi elimination", cpsNode);
     new ShrinkingReducer().rewrite(cpsNode);
     traceGraph("Shrinking reductions", cpsNode);
 
     // Do not rewrite the IR after variable allocation.  Allocation
     // makes decisions based on an approximation of IR variable live
     // ranges that can be invalidated by transforming the IR.
-    new cps.RegisterAllocator().visit(cpsNode);
+    new cps.RegisterAllocator(compiler.internalError).visit(cpsNode);
     return cpsNode;
   }
 
   tree_ir.FunctionDefinition compileToTreeIR(cps.FunctionDefinition cpsNode) {
     tree_builder.Builder builder = new JsTreeBuilder(
         compiler.internalError, compiler.identicalFunction, glue);
     tree_ir.FunctionDefinition treeNode = builder.buildFunction(cpsNode);
     assert(treeNode != null);
     traceGraph('Tree builder', treeNode);
     return treeNode;
@@ skipping 25 matching lines @@
   Iterable<CompilerTask> get tasks {
     // 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(
         StartEndSourceInformation.computeSourceInformation(element));
   }
 }