Compute more SendStructures on ResolverVisitor.

tests/compiler/dart2js/resolver_test.dart

 // Copyright (c) 2012, 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.
 
 import "package:expect/expect.dart";
 import 'dart:async';
 import "package:async_helper/async_helper.dart";
 import 'dart:collection';
 
 import "package:compiler/src/resolution/resolution.dart";
@@ skipping 678 matching lines @@
     ClassElement classElement = compiler.mainApp.find(className);
     Element element;
     element = classElement.lookupConstructor(constructor);
     FunctionExpression tree = (element as FunctionElement).node;
     ResolverVisitor visitor =
         new ResolverVisitor(compiler, element,
             new ResolutionRegistry.internal(compiler,
                 new CollectingTreeElements(element)));
     new InitializerResolver(visitor).resolveInitializers(element, tree);
     visitor.visit(tree.body);
-    Expect.equals(expectedElementCount, map(visitor).length);
+    Expect.equals(expectedElementCount, map(visitor).length,
+        "${map(visitor).values} for '$statement' in context of `$script`");
 
     compareWarningKinds(script, expectedWarnings, compiler.warnings);
     compareWarningKinds(script, expectedErrors, compiler.errors);
     compareWarningKinds(script, expectedInfos, compiler.infos);
   });
 }
 
 Future testClassHierarchy() {
   final MAIN = "main";
   return Future.wait([
@@ skipping 621 matching lines @@
     }
     main() => A.m();
   ''', functionName: 'm');
   check('''
     class A {
       m() => () => await - 3;
     }
     main() => new A().m();
   ''', className: 'A');
 }