Set up a stub pipline for using the new cps-based ir to generate js.

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.
 
 part of ssa;
 
 
 class ValueRangeInfo {
   final ConstantSystem constantSystem;
 
@@ skipping 577 matching lines @@
 
   /**
    * Value ranges for integer instructions. This map gets populated by
    * the dominator tree visit.
    */
   final Map<HInstruction, Range> ranges = new Map<HInstruction, Range>();
 
   final Compiler compiler;
   final ConstantSystem constantSystem;
   final ValueRangeInfo info;
+  final SsaOptimizerTask optimizer;
 
   CodegenWorkItem work;
   HGraph graph;
 
-  SsaValueRangeAnalyzer(this.compiler, constantSystem, this.work)
+  SsaValueRangeAnalyzer(this.compiler,
+                        constantSystem,
+                        this.optimizer,
+                        this.work)
       : info = new ValueRangeInfo(constantSystem),
         this.constantSystem = 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
     // only necessary for this phase.
     removeRangeConversion();
-    JavaScriptBackend backend = compiler.backend;
     // TODO(herhut): Find a cleaner way to pass around ranges.
-    backend.optimizer.ranges = ranges;
+    optimizer.ranges = ranges;
   }
 
   void removeRangeConversion() {
     conversions.forEach((HRangeConversion instruction) {
-      instruction.block.rewrite(instruction, instruction.inputs[0]);;
+      instruction.block.rewrite(instruction, instruction.inputs[0]);
       instruction.block.remove(instruction);
     });
   }
 
   void visitBasicBlock(HBasicBlock block) {
 
     void visit(HInstruction instruction) {
       Range range = instruction.accept(this);
       if (instruction.isInteger(compiler)) {
         assert(range != null);
@@ skipping 435 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);
   }
 }