Create closed world for hello world using .dill file

pkg/compiler/lib/src/kernel/element_map.dart

Index: pkg/compiler/lib/src/kernel/element_map.dart
diff --git a/pkg/compiler/lib/src/kernel/element_map.dart b/pkg/compiler/lib/src/kernel/element_map.dart
index 6648667ec796e45f6586a0929d47433ac13c83a9..f66804a9529e58c258495347c158cdbcce685db9 100644
--- a/pkg/compiler/lib/src/kernel/element_map.dart
+++ b/pkg/compiler/lib/src/kernel/element_map.dart
@@ -10,7 +10,6 @@ import '../constants/constructors.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../common_elements.dart';
-import '../elements/elements.dart';
 import '../elements/entities.dart';
 import '../elements/names.dart';
 import '../elements/operators.dart';
@@ -174,7 +173,7 @@ abstract class KernelToElementMapMixin implements KernelToElementMap {
   Selector getInvocationSelector(ir.InvocationExpression invocation) {
     Name name = getName(invocation.name);
     SelectorKind kind;
-    if (Elements.isOperatorName(invocation.name.name)) {
+    if (Selector.isOperatorName(name.text)) {
       if (name == Names.INDEX_NAME || name == Names.INDEX_SET_NAME) {
         kind = SelectorKind.INDEX;
       } else {