Finish cleaning up analyzer warnings

pkg/compiler/lib/src/serialization/equivalence.dart

Index: pkg/compiler/lib/src/serialization/equivalence.dart
diff --git a/pkg/compiler/lib/src/serialization/equivalence.dart b/pkg/compiler/lib/src/serialization/equivalence.dart
index e0a5d03dc1445b342cf50daf1374bd81825837e6..68075b1a432c4227269f9eb8dda950735cc8c514 100644
--- a/pkg/compiler/lib/src/serialization/equivalence.dart
+++ b/pkg/compiler/lib/src/serialization/equivalence.dart
@@ -252,6 +252,7 @@ bool areAccessSemanticsEquivalent(AccessSemantics a, AccessSemantics b) {
               compoundAccess1.getter, compoundAccess2.getter) &&
           areElementsEquivalent(compoundAccess1.setter, compoundAccess2.setter);
     case AccessKind.CONSTANT:
+    default:
       throw new UnsupportedError('Unsupported access kind: ${a.kind}');
   }
 }
@@ -331,6 +332,7 @@ bool areNewStructuresEquivalent(NewStructure a, NewStructure b) {
       return ad.constantInvokeKind == bd.constantInvokeKind &&
           areConstantsEquivalent(ad.constant, bd.constant);
     case NewStructureKind.LATE_CONST:
+    default:
       throw new UnsupportedError('Unsupported NewStructure kind ${a.kind}.');
   }
 }