Handle const Symbol(...) in closed_world2_test

pkg/compiler/lib/src/resolution/members.dart

Index: pkg/compiler/lib/src/resolution/members.dart
diff --git a/pkg/compiler/lib/src/resolution/members.dart b/pkg/compiler/lib/src/resolution/members.dart
index 3b5c430bada9414d9154c3939d7a5c7333f6504b..53e503edd205942d5d61a4e02f3174290fd6be3d 100644
--- a/pkg/compiler/lib/src/resolution/members.dart
+++ b/pkg/compiler/lib/src/resolution/members.dart
@@ -3840,6 +3840,9 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
   ResolutionResult visitNewExpression(NewExpression node) {
     ConstructorResult result = resolveConstructor(node);
     ConstructorElement constructor = result.element;
+    if (resolution.commonElements.isSymbolConstructor(constructor)) {
+      registry.registerFeature(Feature.SYMBOL_CONSTRUCTOR);
+    }
     ArgumentsResult argumentsResult;
     if (node.isConst) {
       argumentsResult =