Get the basics of deferred libraries working.

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
index 5553144bf0effbe623e99fb54bb84ac1b948a770..c4a1d776d762ee75060451c8b3442d52b108d327 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
@@ -847,3 +847,9 @@ _canonicalMember(obj, name) {
   }
   return name;
 }
+
+/// Emulates the implicit "loadLibrary" function provided by a deferred library.
+///
+/// Libraries are not actually deferred in DDC, so this just returns a future
+/// that completes immediately.
+Future loadLibrary() => new Future.value();