cps-ir: Add support for intercepted calls.

pkg/compiler/lib/src/js_backend/codegen/codegen.dart

Index: pkg/compiler/lib/src/js_backend/codegen/codegen.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/codegen.dart b/pkg/compiler/lib/src/js_backend/codegen/codegen.dart
index bdcb7dc015afc541453cf2550d2ea3ef9ae81ebf..bbb24b16d3d00fef9dd50856470efe8abb0ee2aa 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/codegen.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/codegen.dart
@@ -170,7 +170,6 @@ class CodeGenerator extends tree_ir.Visitor<dynamic, js.Expression> {
                                   Element target,
                                   List<js.Expression> arguments) {
     registry.registerStaticInvocation(target.declaration);
-
     js.Expression elementAccess = glue.staticFunctionAccess(target);
     List<js.Expression> compiledArguments =
         selector.makeArgumentsList(target.implementation,
@@ -197,16 +196,10 @@ class CodeGenerator extends tree_ir.Visitor<dynamic, js.Expression> {
 
   @override
   js.Expression visitInvokeMethod(tree_ir.InvokeMethod node) {
-    // TODO(sigurdm): Handle intercepted invocations.
-    if (glue.isIntercepted(node.selector)) giveup(node);
-    js.Expression receiver = visitExpression(node.receiver);
-
-    List<js.Expression> arguments = visitArguments(node.arguments);
-
-    String methodName = glue.invocationName(node.selector);
     registerMethodInvoke(node);
-
-    return js.propertyCall(receiver, methodName, arguments);
+    return js.propertyCall(visitExpression(node.receiver),
+                           glue.invocationName(node.selector),
+                           visitArguments(node.arguments));
   }
 
   @override