Fix host checked mode failure.

sdk/lib/_internal/compiler/implementation/ssa/nodes.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/nodes.dart	(revision 17447)
+++ sdk/lib/_internal/compiler/implementation/ssa/nodes.dart	(working copy)
@@ -789,8 +789,9 @@
   static const int TYPE_CONVERSION_TYPECODE = 28;
   static const int BAILOUT_TARGET_TYPECODE = 29;
   static const int INVOKE_STATIC_TYPECODE = 30;
-  static const int INVOKE_DYNAMIC_GETTER_TYPECODE = 31;

[kasperl, 2013/01/23 12:38:04]

No more use of 31?

[ngeoffray, 2013/01/23 12:42:23]

No, as well as others. I have updated the constants to remove holes.

   static const int INDEX_TYPECODE = 32;
+  static const int IS_TYPECODE = 33;
+  static const int INVOKE_DYNAMIC_TYPECODE = 34;
 
   HInstruction(this.inputs) : id = idCounter++, usedBy = <HInstruction>[];
 
@@ -1327,6 +1328,13 @@
     // parameter to the call.
     return inputs.length - 2 == selector.argumentCount;
   }
+
+  int typeCode() => HInstruction.INVOKE_DYNAMIC_TYPECODE;
+  bool typeEquals(other) => other is HInvokeDynamic;
+  bool dataEquals(HInvokeDynamic other) {
+    return selector == other.selector
+        && element == other.element;
+  }
 }
 
 class HInvokeClosure extends HInvokeDynamic {
@@ -1390,10 +1398,6 @@
   }
   toString() => 'invoke dynamic getter: $selector';
   accept(HVisitor visitor) => visitor.visitInvokeDynamicGetter(this);
-
-  int typeCode() => HInstruction.INVOKE_DYNAMIC_GETTER_TYPECODE;
-  bool typeEquals(other) => other is HInvokeDynamicGetter;
-  bool dataEquals(HInvokeDynamicGetter other) => selector == other.selector;
 }
 
 class HInvokeDynamicSetter extends HInvokeDynamicField {
@@ -2237,6 +2241,13 @@
   accept(HVisitor visitor) => visitor.visitIs(this);
 
   toString() => "$expression is $typeExpression";
+
+  int typeCode() => HInstruction.IS_TYPECODE;
+  bool typeEquals(HInstruction other) => other is HIs;
+  bool dataEquals(HIs other) {
+    return typeExpression == other.typeExpression
+        && nullOk == other.nullOk;
+  }
 }
 
 class HTypeConversion extends HCheck {