Repro for OOM bug in test.dart (applies to r29345).

dart/sdk/lib/_internal/lib/js_rti.dart

Index: dart/sdk/lib/_internal/lib/js_rti.dart
diff --git a/dart/sdk/lib/_internal/lib/js_rti.dart b/dart/sdk/lib/_internal/lib/js_rti.dart
index aea2fc30d2ab498754937cc20582f9bba5d7ad6f..e4f62fdc3e55e665ea6bd7719cc1c3458f525f4b 100644
--- a/dart/sdk/lib/_internal/lib/js_rti.dart
+++ b/dart/sdk/lib/_internal/lib/js_rti.dart
@@ -161,6 +161,7 @@ String runtimeTypeToString(var type) {
   } else if (type is int) {
     return type.toString();
   } else {
+    // TODO(ahe): Handle function types, and be sure to always return a string.
     return null;
   }
 }
@@ -326,6 +327,7 @@ bool areSubtypes(var s, var t) {
   return true;
 }
 
+// TODO(ahe): Remove this.
 Object functionSubtypeCast(Object object, String signatureName,
                            String contextName, var context,
                            var typeArguments) {
@@ -339,6 +341,7 @@ Object functionSubtypeCast(Object object, String signatureName,
   return object;
 }
 
+// TODO(ahe): Remove this.
 Object assertFunctionSubtype(Object object, String signatureName,
                              String contextName, var context,
                              var typeArguments) {
@@ -358,6 +361,7 @@ Object assertFunctionSubtype(Object object, String signatureName,
  * object in which the runtime values of these can be found or [typeArguments]
  * contains these values as a list of runtime type information.
  */
+// TODO(ahe): Remove this.
 bool checkFunctionSubtype(var target, String signatureName,
                           String contextName, var context,
                           var typeArguments) {
@@ -500,11 +504,11 @@ bool isSubtype(var s, var t) {
   var typeOfT = isJsArray(t) ? getIndex(t, 0) : t;
   // Check for a subtyping flag.
   var name = runtimeTypeToString(typeOfT);
-  var test = '${JS_OPERATOR_IS_PREFIX()}${name}';
-  if (hasNoField(typeOfS, test)) return false;
   // Get the necessary substitution of the type arguments, if there is one.
   var substitution;
   if (isNotIdentical(typeOfT, typeOfS)) {
+    var test = '${JS_OPERATOR_IS_PREFIX()}${name}';
+    if (hasNoField(typeOfS, test)) return false;
     var field = '${JS_OPERATOR_AS_PREFIX()}${runtimeTypeToString(typeOfT)}';
     substitution = getField(typeOfS, field);
   }