dart2js cps: Some fixes for yield.

pkg/compiler/lib/src/cps_ir/cps_ir_tracer.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.
 
 library dart2js.ir_tracer;
 
 import 'dart:async' show EventSink;
 import 'cps_ir_nodes.dart' as cps_ir;
 import '../tracer.dart';
 
@@ skipping 220 matching lines @@
 
   visitBranch(cps_ir.Branch node) {
     String dummy = names.name(node);
     String condition = formatReference(node.condition);
     String trueCont = formatReference(node.trueContinuation);
     String falseCont = formatReference(node.falseContinuation);
     String strict = node.isStrictCheck ? "Strict" : "NonStrict";
     printStmt(dummy, "Branch $condition ($trueCont, $falseCont) $strict");
   }
 
+  visitAwait(cps_ir.Await node) {
+    String dummy = names.name(node);
+    String value = formatReference(node.input);
+    String continuation = formatReference(node.continuation);
+    printStmt(dummy, 'Await $value $continuation');
+  }
+
+  visitYield(cps_ir.Yield node) {
+    String dummy = names.name(node);
+    String name = node.hasStar ? 'YieldStar' : 'Yield';
+    String value = formatReference(node.input);
+    String continuation = formatReference(node.continuation);
+    printStmt(dummy, '$name $value $continuation');
+  }
+
   visitSetMutable(cps_ir.SetMutable node) {
     String variable = names.name(node.variable.definition);
     String value = formatReference(node.value);
     return 'SetMutable $variable := $value';
   }
 
   String formatReference(cps_ir.Reference ref) {
     cps_ir.Definition target = ref.definition;
     if (target is cps_ir.Continuation && target.isReturnContinuation) {
       return "return"; // Do not generate a name for the return continuation
@@ skipping 140 matching lines @@
   }
 
   visitSetIndex(cps_ir.SetIndex node) {
     String object = formatReference(node.object);
     String index = formatReference(node.index);
     String value = formatReference(node.value);
     return 'SetIndex $object $index $value';
   }
 
   @override
-  visitAwait(cps_ir.Await node) {
-    String value = formatReference(node.input);
-    String continuation = formatReference(node.continuation);
-    return 'Await $value $continuation';
-  }
-
-  @override
-  visitYield(cps_ir.Yield node) {
-    String value = formatReference(node.input);
-    String continuation = formatReference(node.continuation);
-    return 'Yield $value $continuation';
-  }
-
-  @override
   visitRefinement(cps_ir.Refinement node) {
     String value = formatReference(node.value);
     return 'Refinement $value ${node.type}';
   }
 }
 
 /**
  * Invents (and remembers) names for Continuations, Parameters, etc.
  * The names must match the conventions used by IR Hydra, e.g.
  * Continuations and Functions must have names of form B### since they
@@ skipping 275 matching lines @@
   @override
   visitYield(cps_ir.Yield node) {
     addEdgeToContinuation(node.continuation);
   }
 
   @override
   visitRefinement(cps_ir.Refinement node) {
     unexpectedNode(node);
   }
 }