Test closed world model after deserialization.

tests/compiler/dart2js/serialization_impact_test.dart

Index: tests/compiler/dart2js/serialization_impact_test.dart
diff --git a/tests/compiler/dart2js/serialization_impact_test.dart b/tests/compiler/dart2js/serialization_impact_test.dart
index 0bd48338f8f483e8f7eae25ace0227e0058feb5d..4073f40bd2ad3fd57e41af5876e6b009d1270316 100644
--- a/tests/compiler/dart2js/serialization_impact_test.dart
+++ b/tests/compiler/dart2js/serialization_impact_test.dart
@@ -47,15 +47,18 @@ Future check(
   deserialize(compilerDeserialized, serializedData);
   await compilerDeserialized.run(entryPoint);
 
-  checkResolutionImpacts(compilerNormal, compilerDeserialized);
+  checkResolutionImpacts(compilerNormal, compilerDeserialized, verbose: true);
 }
 
 /// Check equivalence of [impact1] and [impact2].
 void checkImpacts(Element element1, Element element2,
-                  ResolutionImpact impact1, ResolutionImpact impact2) {
+                  ResolutionImpact impact1, ResolutionImpact impact2,
+                  {bool verbose: false}) {
   if (impact1 == null || impact2 == null) return;
 
-  print('Checking impacts for $element1 vs $element2');
+  if (verbose) {
+    print('Checking impacts for $element1 vs $element2');
+  }
 
   testResolutionImpactEquivalence(impact1, impact2, const CheckStrategy());
 }
@@ -63,7 +66,10 @@ void checkImpacts(Element element1, Element element2,
 
 /// Check equivalence between all resolution impacts common to [compiler1] and
 /// [compiler2].
-void checkResolutionImpacts(Compiler compiler1, Compiler compiler2) {
+void checkResolutionImpacts(
+    Compiler compiler1,
+    Compiler compiler2,
+    {bool verbose: false}) {
 
   void checkMembers(Element member1, Element member2) {
     if (member1.isClass && member2.isClass) {
@@ -87,7 +93,8 @@ void checkResolutionImpacts(Compiler compiler1, Compiler compiler2) {
       checkImpacts(
           member1, member2,
           compiler1.resolution.getResolutionImpact(member1),
-          compiler2.serialization.deserializer.getResolutionImpact(member2));
+          compiler2.serialization.deserializer.getResolutionImpact(member2),
+          verbose: verbose);
     }
   }