dart2js/kernel: Implement type literal and JS_INTERCEPTOR_CONSTANT

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

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index 8710f840ec55c9777f40d99953f7f0c12b6635c2..1f98bde14faeba20f4a8f6fec2f2daebe0a98fd5 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -255,6 +255,11 @@ class KernelAstAdapter {
     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);