dart2js cps: Status updates and minor fixes for host checked mode.

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.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 tree_ir_nodes;
 
 import '../constants/values.dart' as values;
 import '../dart_types.dart' show DartType, InterfaceType, TypeVariableType;
 import '../elements/elements.dart';
 import '../io/source_information.dart' show SourceInformation;
@@ skipping 1516 matching lines @@
     return node;
   }
 
   visitAwait(Await node) {
     node.input = visitExpression(node.input);
     return node;
   }
 
   visitYield(Yield node) {
     node.input = visitExpression(node.input);
+    node.next = visitStatement(node.next);
     return node;
   }
 }
 
 class FallthroughTarget {
   final Statement target;
   int useCount = 0;
 
   FallthroughTarget(this.target);
 }
@@ skipping 19 matching lines @@
 
   /// Number of uses of the current fallthrough target.
   int get useCount => _stack.last.useCount;
 
   /// Indicate that a statement will fall through to the current fallthrough
   /// target.
   void use() {
     ++_stack.last.useCount;
   }
 }