Support serialization of the compiler backbone.

pkg/compiler/lib/src/use_unused_api.dart

Index: pkg/compiler/lib/src/use_unused_api.dart
diff --git a/pkg/compiler/lib/src/use_unused_api.dart b/pkg/compiler/lib/src/use_unused_api.dart
index 492c00c113b7cf9a24a571f26a9c06aff31bb77d..c87a845769bd57b2287124e11965153145ce4e58 100644
--- a/pkg/compiler/lib/src/use_unused_api.dart
+++ b/pkg/compiler/lib/src/use_unused_api.dart
@@ -33,6 +33,7 @@ import 'js_backend/js_backend.dart' as js_backend;
 import 'js_emitter/js_emitter.dart' as js_emitter;
 import 'js_emitter/program_builder.dart' as program_builder;
 import 'resolution/semantic_visitor.dart' as semantic_visitor;
+import 'resolution/operators.dart' as operators;
 import 'source_file_provider.dart' as source_file_provider;
 import 'ssa/ssa.dart' as ssa;
 import 'tree/tree.dart' as tree;
@@ -50,7 +51,7 @@ void main(List<String> arguments) {
   useApi(null);
   dart2js.main(arguments);
   dart2jslib.isPublicName(null);
-  useConstant(null, null, null, null, null);
+  useConstant();
   useNode(null);
   useUtil(null);
   useSetlet(null);
@@ -81,16 +82,38 @@ void main(List<String> arguments) {
 useApi(api.ReadStringFromUri uri) {
 }
 
-void useConstant(constants.ConstantValue constant,
-                 constants.ConstantExpression expression,
-                 constants.ConstructedConstantExpression constructedConstant,
-                 constants.ConstantSystem cs,
-                 constants.Environment env) {
+class NullConstantConstructorVisitor extends constants.ConstantConstructorVisitor {
+  @override
+  visitGenerative(constants.GenerativeConstantConstructor constructor, arg) {
+  }
+
+  @override
+  visitRedirectingFactory(
+      constants.RedirectingFactoryConstantConstructor constructor, arg) {
+  }
+
+  @override
+  visitRedirectingGenerative(
+      constants.RedirectingGenerativeConstantConstructor constructor, arg) {
+  }
+}
+
+void useConstant([constants.ConstantValue constant,
+                  constants.ConstantExpression expression,
+                  constants.ConstructedConstantExpression constructedConstant,
+                  constants.ConstantSystem cs,
+                  constants.Environment env]) {
   constant.isObject;
   cs.isBool(constant);
   constructedConstant.computeInstanceType();
   constructedConstant.computeInstanceFields();
   expression.evaluate(null, null);
+  new NullConstantConstructorVisitor()
+      ..visit(null, null)
+      ..visitGenerative(null, null)
+      ..visitRedirectingFactory(null, null)
+      ..visitRedirectingGenerative(null, null);
+
 }
 
 void useNode(tree.Node node) {
@@ -293,6 +316,8 @@ useProgramBuilder(program_builder.ProgramBuilder builder) {
 }
 
 useSemanticVisitor() {
+  operators.UnaryOperator.fromKind(null);
+  operators.BinaryOperator.fromKind(null);
   new semantic_visitor.BulkSendVisitor()
       ..apply(null, null)
       ..visitSuperFieldFieldCompound(null, null, null, null, null, null);