Add deferred loading to Kernel.

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index e0f85cc7c432217f6979d33a109490f66bd96602..c12d7c40d15f0cb2628afbce39387a613a1724da 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -355,6 +355,13 @@ class KernelAstAdapter extends KernelElementAdapterMixin {
     });
   }
 
+  ir.Procedure get checkDeferredIsLoaded =>
+      kernel.functions[_backend.helpers.checkDeferredIsLoaded];
+
+  TypeMask get checkDeferredIsLoadedType =>
+      TypeMaskFactory.inferredReturnTypeForElement(
+          _backend.helpers.checkDeferredIsLoaded, _globalInferenceResults);
+
   ir.Procedure get createInvocationMirror =>
       kernel.functions[_backend.helpers.createInvocationMirror];