dart2js cps_ir: Use interceptors for is-checks.

pkg/compiler/lib/src/js_backend/codegen/glue.dart

Index: pkg/compiler/lib/src/js_backend/codegen/glue.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/glue.dart b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
index 37dd0ae333038226b49027cb39d9ab9ec0e54bbc..0b4eba7d346ab5105831acca3509998f206b5a51 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/glue.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
@@ -7,6 +7,8 @@ library code_generator_dependencies;
 import '../js_backend.dart';
 import '../../common/registry.dart' show
     Registry;
+import '../../common/codegen.dart' show
+    CodegenRegistry;
 import '../../compiler.dart' show
     Compiler;
 import '../../constants/values.dart';
@@ -19,6 +21,7 @@ import '../../enqueue.dart' show
 import '../../elements/elements.dart';
 import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
+import '../../native/native.dart' show NativeBehavior;
 import '../../universe/selector.dart' show
     Selector;
 import '../../world.dart' show
@@ -126,6 +129,10 @@ class Glue {
     return _backend.getInterceptedClassesOn(selector.name);
   }
 
+  Set<ClassElement> get interceptedClasses {
+    return _backend.interceptedClasses;
+  }
+
   void registerSpecializedGetInterceptor(Set<ClassElement> classes) {
     _backend.registerSpecializedGetInterceptor(classes);
   }
@@ -228,12 +235,15 @@ class Glue {
   }
 
   js.Expression generateTypeRepresentation(DartType dartType,
-                                           List<js.Expression> arguments) {
+                                           List<js.Expression> arguments,
+                                           CodegenRegistry registry) {
     int variableIndex = 0;
     js.Expression representation = _backend.rti.getTypeRepresentation(
         dartType,
         (_) => arguments[variableIndex++]);
     assert(variableIndex == arguments.length);
+    // Representation contains JavaScript Arrays.
+    registry.registerInstantiatedClass(_backend.jsArrayClass);
     return representation;
   }
 
@@ -258,7 +268,10 @@ class Glue {
     return _compiler.world.hasAnyStrictSubtype(element);
   }
 
+  ClassElement get jsFixedArrayClass => _backend.jsFixedArrayClass;
   ClassElement get jsExtendableArrayClass => _backend.jsExtendableArrayClass;
+  ClassElement get jsUnmodifiableArrayClass =>
+      _backend.jsUnmodifiableArrayClass;
   ClassElement get jsMutableArrayClass => _backend.jsMutableArrayClass;
 
   bool isStringClass(ClassElement classElement) =>
@@ -268,4 +281,10 @@ class Glue {
   bool isBoolClass(ClassElement classElement) =>
       classElement == _backend.jsBoolClass ||
       classElement == _compiler.boolClass;
+
+  // TODO(sra): Should this be part of CodegenRegistry?
+  void registerNativeBehavior(NativeBehavior nativeBehavior, node) {
+    if (nativeBehavior == null) return;
+    _enqueuer.nativeEnqueuer.registerNativeBehavior(nativeBehavior, node);
+  }
 }