Update elements, nodes and visitors for serialization.

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 f9b77dea1521200bc991e8442169a23dc28886e2..5df0a19cae4fffd884e2adcb968c578ccbbce194 100644
--- a/pkg/compiler/lib/src/serialization/equivalence.dart
+++ b/pkg/compiler/lib/src/serialization/equivalence.dart
@@ -272,6 +272,13 @@ class ElementIdentityEquivalence extends BaseElementVisitor<bool, Element> {
     return checkMembers(element1.memberContext, element2.memberContext);
   }
 
+  @override
+  bool visitLocalVariableElement(
+      LocalVariableElement element1, LocalVariableElement element2) {
+    // TODO(johnniwinther): Define an equivalence on locals.
+    return checkMembers(element1.memberContext, element2.memberContext);
+  }
+
   bool visitAbstractFieldElement(
       AbstractFieldElement element1, AbstractFieldElement element2) {
     return checkMembers(element1, element2);