build kernel for the entire program after resolution

tests/compiler/dart2js/kernel/impact_test.dart

 // Copyright (c) 2016, 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 dart2js.kernel.impact_test;
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/commandline_options.dart';
@@ skipping 66 matching lines @@
 '''
 };
 
 main(List<String> args) {
   asyncTest(() async {
     enableDebugMode();
     Uri entryPoint = Uri.parse('memory:main.dart');
     Compiler compiler = compilerFor(
         entryPoint: entryPoint,
         memorySourceFiles: SOURCE,
-        options: [Flags.analyzeOnly]);
+        options: [Flags.analyzeOnly, Flags.useKernel]);
     compiler.resolution.retainCachesForTesting = true;
     await compiler.run(entryPoint);
-    compiler.mainApp.forEachLocalMember(
-        (element) => checkElement(compiler, element));
+    compiler.mainApp
+        .forEachLocalMember((element) => checkElement(compiler, element));
   });
 }
 
 void checkElement(Compiler compiler, AstElement element) {
-  ResolutionImpact astImpact =
-      compiler.resolution.getResolutionImpact(element);
+  ResolutionImpact astImpact = compiler.resolution.getResolutionImpact(element);
   ResolutionImpact kernelImpact = build(compiler, element.resolvedAst);
-  testResolutionImpactEquivalence(astImpact, kernelImpact,
-      const CheckStrategy());
+  testResolutionImpactEquivalence(
+      astImpact, kernelImpact, const CheckStrategy());
 }