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 7212cbb10b787b2b10a86f03701305fd831c9173..57b08fa93a9aabd22d3efcfd8f9451ba370448a2 100644
--- a/tests/compiler/dart2js/kernel/test_helpers.dart
+++ b/tests/compiler/dart2js/kernel/test_helpers.dart
@@ -63,6 +63,12 @@ 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 IndexedClass) {
           List<InterfaceType> aMixinTypes = [];