dart2js: remove JS_OBJECT_CLASS_NAME and JS_NULL_CLASS_NAME from foreign

sdk/lib/_internal/compiler/js_lib/js_helper.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library _js_helper;
 
 import 'dart:_async_await_error_codes' as async_error_codes;
 
 import 'dart:_js_embedded_names' show
     DEFERRED_LIBRARY_URIS,
@@ skipping 39 matching lines @@
     JS_EMBEDDED_GLOBAL,
     JS_FUNCTION_TYPE_NAMED_PARAMETERS_TAG,
     JS_FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG,
     JS_FUNCTION_TYPE_REQUIRED_PARAMETERS_TAG,
     JS_FUNCTION_TYPE_RETURN_TYPE_TAG,
     JS_FUNCTION_TYPE_VOID_RETURN_TAG,
     JS_GET_FLAG,
     JS_GET_NAME,
     JS_HAS_EQUALS,
     JS_IS_INDEXABLE_FIELD_NAME,
-    JS_NULL_CLASS_NAME,
-    JS_OBJECT_CLASS_NAME,
     JS_OPERATOR_AS_PREFIX,
     JS_SIGNATURE_NAME,
     JS_STRING_CONCAT,
     RAW_DART_FUNCTION_REF;
 
 import 'dart:_interceptors';
 import 'dart:_internal' as _symbol_dev;
 import 'dart:_internal' show MappedIterable;
 
 import 'dart:_native_typed_data';
@@ skipping 36 matching lines @@
 
 
 /// Creates a function type object.
 // TODO(floitsch): move this to foreign_helper.dart or similar.
 @ForceInline()
 createDartFunctionType() {
   return JS_BUILTIN('returns:=Object;effects:none;depends:none',
                     JsBuiltin.createFunctionType);
 }
 
-/// Returns true if the given [type] is _the_ `Function` type.
-// TODO(floitsch): move this to foreign_helper.dart or similar.
-@ForceInline()
-bool isDartFunctionTypeLiteral(Object type) {
-  return JS_BUILTIN('returns:bool;effects:none;depends:none',
-                    JsBuiltin.isFunctionTypeLiteral, type);
-}
-
 /// Retrieves the class name from type information stored on the constructor of
 /// [type].
 // TODO(floitsch): move this to foreign_helper.dart or similar.
 @ForceInline()
 String getDartTypeName(Object type) {
   return JS_BUILTIN('String', JsBuiltin.typeName, type);
 }
 
 /// Returns the raw runtime type of the given object [o].
 ///
 /// The argument [o] must be the interceptor for primitive types. If
 /// necessary run it through [getInterceptor] first.
 // TODO(floitsch): move this to foreign_helper.dart or similar.
 // TODO(floitsch): we should call getInterceptor ourselves, but currently
 //    getInterceptor is not GVNed.
 @ForceInline()
 Object getRawRuntimeType(Object o) {
   return JS_BUILTIN('', JsBuiltin.rawRuntimeType, o);
 }
 
 /// Returns whether the given [type] is a subtype of [other].
 ///
 /// The argument [other] is the name of the other type, as computed by
 /// [runtimeTypeToString].
+@ForceInline()
 bool builtinIsSubtype(type, String other) {
   return JS_BUILTIN('returns:bool;effects:none;depends:none',
                     JsBuiltin.isSubtype, other, type);
 }
 
+/// Returns true if the given [type] is _the_ `Function` type.
+// TODO(floitsch): move this to foreign_helper.dart or similar.
+@ForceInline()
+bool isDartFunctionTypeRti(Object type) {
+  return JS_BUILTIN('returns:bool;effects:none;depends:none',
+                    JsBuiltin.isFunctionTypeRti, type);
+}
+
+/// Returns whether the given type is _the_ Dart Object type.
+// TODO(floitsch): move this to foreign_helper.dart or similar.
+@ForceInline()
+bool isDartObjectTypeRti(type) {
+  return JS_BUILTIN('returns:bool;effects:none;depends:none',
+                    JsBuiltin.isDartObjectTypeRti, type);
+}
+
+/// Returns whether the given type is _the_ null type.
+// TODO(floitsch): move this to foreign_helper.dart or similar.
+@ForceInline()
+bool isNullTypeRti(type) {
+  return JS_BUILTIN('returns:bool;effects:none;depends:none',
+                    JsBuiltin.isNullTypeRti, type);
+}
+
 /// Returns the metadata of the given [index].
 @ForceInline()
 getMetadata(int index) {
   return JS_BUILTIN('returns:var;effects:none;depends:none',
                     JsBuiltin.getMetadata, index);
 }
 
 /// Returns the type of the given [index].
 @ForceInline()
 getType(int index) {
@@ skipping 3909 matching lines @@
   // This is a function that will return a helper function that does the
   // iteration of the sync*.
   //
   // Each invocation should give a body with fresh state.
   final dynamic /* js function */ _outerHelper;
 
   SyncStarIterable(this._outerHelper);
 
   Iterator get iterator => new SyncStarIterator(JS('', '#()', _outerHelper));
 }