Add ConstructorBodyEntity

tests/compiler/dart2js/kernel/test_helpers.dart

Index: tests/compiler/dart2js/kernel/test_helpers.dart
diff --git a/tests/compiler/dart2js/kernel/test_helpers.dart b/tests/compiler/dart2js/kernel/test_helpers.dart
index 12826f8a6c0c8f86631103e65f51d7d092df2a81..b2d7ebf66174933f4d8dd61c69334a71605e7c33 100644
--- a/tests/compiler/dart2js/kernel/test_helpers.dart
+++ b/tests/compiler/dart2js/kernel/test_helpers.dart
@@ -61,6 +61,12 @@ class KernelEquivalence {
                   a, b, 'enclosingClass', a.enclosingClass, b.enclosingClass);
         }
         return false;
+      case ElementKind.GENERATIVE_CONSTRUCTOR_BODY:
+        ConstructorBodyElement aConstructorBody = a;
+        if (b is ConstructorBodyEntity) {
+          return entityEquivalence(aConstructorBody.constructor, b.constructor);
+        }
+        return false;
       case ElementKind.CLASS:
         if (b is KClass) {
           List<InterfaceType> aMixinTypes = [];