Support intercepted getters, setters and index operations.

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

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
index 6dc6f9f635931c0ca303a9c7b7451f3e7b35303a..e3c08f0f582e334f450e908607ecc2f9bee350ea 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
@@ -204,12 +204,12 @@ class InvokeMethod extends Expression implements Invoke {
 
   InvokeMethod(Primitive receiver,
                Selector selector,
-               Continuation cont,
-               List<Primitive> args)
+               Continuation continuation,
+               List<Primitive> arguments)
       : this.internal(new Reference<Primitive>(receiver),
                       selector,
-                      new Reference<Continuation>(cont),
-                      _referenceList(args));
+                      new Reference<Continuation>(continuation),
+                      _referenceList(arguments));
 
   InvokeMethod.internal(this.receiver,
                         this.selector,
@@ -224,8 +224,6 @@ class InvokeMethod extends Expression implements Invoke {
            (selector.kind == SelectorKind.INDEX && arguments.length == 2));
   }
 
-  bool get isIntercepted => receiver.definition is Interceptor;
-
   accept(Visitor visitor) => visitor.visitInvokeMethod(this);
 }