WIP: Compute constant expressions in resolution.

tests/compiler/dart2js/serialization_test.dart

Index: tests/compiler/dart2js/serialization_test.dart
diff --git a/tests/compiler/dart2js/serialization_test.dart b/tests/compiler/dart2js/serialization_test.dart
index c913a3cf5ad7daa3e60dc60c9fff62a35f73ee93..377f40a52f02ce11d4e451138c396c43ee6ddfbc 100644
--- a/tests/compiler/dart2js/serialization_test.dart
+++ b/tests/compiler/dart2js/serialization_test.dart
@@ -326,6 +326,12 @@ class ConstantConstructorEquivalence
         constructor1.thisConstructorInvocation,
         constructor2.thisConstructorInvocation);
   }
+
+  @override
+  visitErroneous(ErroneousConstantConstructor constructor,
+                 ConstantConstructor arg) {
+    // Do nothing.
+  }
 }
 
 /// Check that the values [property] of [object1] and [object2], [value1] and