Make dart2js deferred loading work in cps mode.

sdk/lib/_internal/compiler/implementation/use_unused_api.dart

Index: sdk/lib/_internal/compiler/implementation/use_unused_api.dart
diff --git a/sdk/lib/_internal/compiler/implementation/use_unused_api.dart b/sdk/lib/_internal/compiler/implementation/use_unused_api.dart
index 4d31f056c90cb7567a2cb3d7ab3541b620ddf92c..61600aa07ceb7d5b6c61bea8954148002d8f7d45 100644
--- a/sdk/lib/_internal/compiler/implementation/use_unused_api.dart
+++ b/sdk/lib/_internal/compiler/implementation/use_unused_api.dart
@@ -46,6 +46,8 @@ import 'cps_ir/cps_ir_nodes_sexpr.dart' as cps_ir_nodes_sexpr;
 
 import 'cps_ir/cps_ir_builder.dart' as ir_builder;
 
+import 'js_emitter/js_emitter.dart' as js_emitter;
+
 class ElementVisitor extends elements_visitor.ElementVisitor {
   visitElement(e) {}
 }
@@ -72,6 +74,7 @@ void main(List<String> arguments) {
   useIr(null, null, null);
   useCompiler(null);
   useTypes();
+  useCodeEmitterTask(null);
 }
 
 useApi() {
@@ -256,3 +259,7 @@ useCompiler(dart2jslib.Compiler compiler) {
 useTypes() {
   new dart_types.ResolvedTypedefType(null, null, null).unalias(null);
 }
+
+useCodeEmitterTask(js_emitter.CodeEmitterTask codeEmitterTask) {
+  codeEmitterTask.clearCspPrecompiledNodes();
+}