Chromium Code Reviews| Index: pkg/compiler/lib/src/helpers/expensive_map.dart | 
| diff --git a/sdk/lib/_internal/compiler/implementation/helpers/expensive_map.dart b/pkg/compiler/lib/src/helpers/expensive_map.dart | 
| similarity index 100% | 
| copy from sdk/lib/_internal/compiler/implementation/helpers/expensive_map.dart | 
| copy to pkg/compiler/lib/src/helpers/expensive_map.dart |