dart2js/kernel: Implement type literal and JS_INTERCEPTOR_CONSTANT

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

 // Copyright (c) 2016, 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.
 
 import 'package:js_runtime/shared/embedded_names.dart';
 import 'package:kernel/ast.dart' as ir;
 
 import '../constants/expressions.dart';
 import '../common.dart';
 import '../common/names.dart';
@@ skipping 237 matching lines @@
   }
 
   ConstantValue getConstantFor(ir.Node node) {
     ConstantValue constantValue =
         _backend.constants.getConstantValueForNode(getNode(node), elements);
     assert(invariant(getNode(node), constantValue != null,
         message: 'No constant computed for $node'));
     return constantValue;
   }
 
+  ConstantValue getConstantForType(ir.DartType irType) {
+    DartType type = getDartType(irType);
+    return _backend.constantSystem.createType(_compiler, type.asRaw());
+  }
+
   bool isIntercepted(ir.Node node) {
     Selector selector = getSelector(node);
     return _backend.isInterceptedSelector(selector);
   }
 
   bool isInterceptedSelector(Selector selector) {
     return _backend.isInterceptedSelector(selector);
   }
 
   LibraryElement get jsHelperLibrary => _backend.helpers.jsHelperLibrary;
@@ skipping 471 matching lines @@
     astAdapter.reporter.internalError(
         CURRENT_ELEMENT_SPANNABLE, "Unexpected constant target: $element.");
     return null;
   }
 
   @override
   ConstantExpression visitStringLiteral(ir.StringLiteral node) {
     return new StringConstantExpression(node.value);
   }
 }