Constant instance creation dependencies also should be computed.

pkg/analyzer/lib/src/generated/constant.dart

 // Copyright (c) 2014, 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 analyzer.src.generated.constant;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 1223 matching lines @@
  * expressions.
  */
 class ConstantExpressionsDependenciesFinder extends RecursiveAstVisitor {
   /**
    * The constants whose values need to be computed.
    */
   HashSet<ConstantEvaluationTarget> dependencies =
       new HashSet<ConstantEvaluationTarget>();
 
   @override
+  void visitInstanceCreationExpression(InstanceCreationExpression node) {
+    if (node.isConst) {
+      _find(node);
+    } else {
+      super.visitInstanceCreationExpression(node);
+    }
+  }
+
+  @override
   void visitListLiteral(ListLiteral node) {
     if (node.constKeyword != null) {
       _find(node);
     } else {
       super.visitListLiteral(node);
     }
   }
 
   @override
   void visitMapLiteral(MapLiteral node) {
@@ skipping 4187 matching lines @@
       return BoolState.from(_element == rightElement);
     } else if (rightOperand is DynamicState) {
       return BoolState.UNKNOWN_VALUE;
     }
     return BoolState.FALSE_STATE;
   }
 
   @override
   String toString() => _element == null ? "-unknown-" : _element.name;
 }