dart2js cps: Rewrite more List operations into JS array operations.

pkg/compiler/lib/src/cps_ir/cps_fragment.dart

Index: pkg/compiler/lib/src/cps_ir/cps_fragment.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_fragment.dart b/pkg/compiler/lib/src/cps_ir/cps_fragment.dart
index 0c8e0270a54fede4c31e1b0a5d250e5fc8732303..9bdb9ea15f882f2e4078ca1b9748d7841c50ec39 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_fragment.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_fragment.dart
@@ -112,6 +112,16 @@ class CpsFragment {
     return letPrim(new ApplyBuiltinOperator(op, args, sourceInformation));
   }
 
+  Primitive invokeBuiltin(BuiltinMethod method, 
+                          Primitive receiver, 
+                          List<Primitive> arguments,
+                          {bool receiverIsNotNull: false}) {
+    ApplyBuiltinMethod apply = 
+        new ApplyBuiltinMethod(method, receiver, arguments, sourceInformation);
+    apply.receiverIsNotNull = receiverIsNotNull;
+    return letPrim(apply);
+  }
+
   /// Inserts an invocation. binds its continuation, and returns the
   /// continuation parameter (i.e. the return value of the invocation).
   ///