Support forEachClassMember on closure classes

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

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library js_backend.backend.impact_transformer;
 
+import '../closure.dart';
 import '../common.dart';
 import '../common_elements.dart';
 import '../common/backend_api.dart' show ImpactTransformer;
 import '../common/codegen.dart' show CodegenImpact;
 import '../common/resolution.dart' show ResolutionImpact;
+import '../common_elements.dart' show ElementEnvironment;
 import '../constants/expressions.dart';
-import '../common_elements.dart' show ElementEnvironment;
 import '../elements/entities.dart';
 import '../elements/types.dart';
 import '../native/enqueue.dart';
 import '../native/native.dart' as native;
 import '../options.dart';
 import '../universe/feature.dart';
 import '../universe/use.dart'
     show StaticUse, StaticUseKind, TypeUse, TypeUseKind;
 import '../universe/world_impact.dart' show TransformedWorldImpact, WorldImpact;
 import '../util/util.dart';
@@ skipping 396 matching lines @@
     }
 
     for (Pair<DartType, DartType> check
         in impact.typeVariableBoundsSubtypeChecks) {
       _rtiChecksBuilder.registerTypeVariableBoundsSubtypeCheck(
           check.a, check.b);
     }
 
     for (StaticUse staticUse in impact.staticUses) {
       switch (staticUse.kind) {
-        case StaticUseKind.CLOSURE:
-          Local closure = staticUse.element;
-          if (_rtiNeed.localFunctionNeedsRti(closure)) {
+        case StaticUseKind.CALL_METHOD:
+          FunctionEntity callMethod = staticUse.element;
+          // TODO(johnniwinther): Remove [localFunctionNeedsRti] and use
+          // the call method instead.
+          if (_rtiNeed.methodNeedsRti(callMethod)) {
             _impacts.computeSignature
                 .registerImpact(transformed, _elementEnvironment);
+          } else if (callMethod is SynthesizedCallMethodElementX) {
+            if (_rtiNeed.localFunctionNeedsRti(callMethod.expression)) {
+              _impacts.computeSignature
+                  .registerImpact(transformed, _elementEnvironment);
+            }
           }
           break;
         case StaticUseKind.CONST_CONSTRUCTOR_INVOKE:
         case StaticUseKind.CONSTRUCTOR_INVOKE:
           _lookupMapAnalysis.registerInstantiatedType(staticUse.type);
           break;
         default:
       }
     }
 
@@ skipping 25 matching lines @@
           _impacts.asyncStarBody
               .registerImpact(transformed, _elementEnvironment);
           break;
       }
     }
 
     // TODO(johnniwinther): Remove eager registration.
     return transformed;
   }
 }