Handle symbol literals in closed_world2_test

pkg/compiler/lib/src/compile_time_constants.dart

Index: pkg/compiler/lib/src/compile_time_constants.dart
diff --git a/pkg/compiler/lib/src/compile_time_constants.dart b/pkg/compiler/lib/src/compile_time_constants.dart
index 883a124aa5f426f6691c68ee6aee3c6544a80564..eeba01fb9647fde2606ae2918121807a189adec5 100644
--- a/pkg/compiler/lib/src/compile_time_constants.dart
+++ b/pkg/compiler/lib/src/compile_time_constants.dart
@@ -586,13 +586,14 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
   }
 
   AstConstant visitLiteralSymbol(LiteralSymbol node) {
-    ResolutionInterfaceType type = commonElements.symbolType;
+    ResolutionInterfaceType type = commonElements.symbolImplementationType;
     String text = node.slowNameString;
     List<AstConstant> arguments = <AstConstant>[
       new AstConstant(context, node, new StringConstantExpression(text),
           constantSystem.createString(new LiteralDartString(text)))
     ];
-    ConstructorElement constructor = compiler.commonElements.symbolConstructor;
+    ConstructorElement constructor =
+        compiler.commonElements.symbolConstructorTarget;
     AstConstant constant = createConstructorInvocation(
         node, type, constructor, CallStructure.ONE_ARG,
         normalizedArguments: arguments);