kernel->ssa: get simple constructors working

tests/compiler/dart2js/kernel/simple_function_test.dart

Index: tests/compiler/dart2js/kernel/simple_function_test.dart
diff --git a/tests/compiler/dart2js/kernel/simple_function_test.dart b/tests/compiler/dart2js/kernel/simple_function_test.dart
index 65391344ed36b9aa4fdbda0c85fb352e431afece..d58ca332db8b96f4ef1154202a1fddd54aa8644b 100644
--- a/tests/compiler/dart2js/kernel/simple_function_test.dart
+++ b/tests/compiler/dart2js/kernel/simple_function_test.dart
@@ -42,6 +42,6 @@ main() {
       main() {
         foo(1);
       }''';
-    return check(code, entry: 'foo');
+    return check(code, lookup: 'foo');
   });
 }