Fix generation of variable initializer synthetic functions in summary AST linker.

pkg/analyzer/lib/src/summary/link.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.
 
 /**
  * This library is capable of producing linked summaries from unlinked
  * ones (or prelinked ones).  It functions by building a miniature
  * element model to represent the contents of the summaries, and then
  * scanning the element model to gather linked information and adding
  * it to the summary data structures.
@@ skipping 4566 matching lines @@
       } else {
         _inferredType = compilationUnit.getLinkedType(
             unlinkedVariable.inferredTypeSlot, _typeParameterContext);
       }
     }
     return _inferredType;
   }
 
   @override
   FunctionElementForLink_Initializer get initializer {
-    if (unlinkedVariable.constExpr == null) {
+    if (unlinkedVariable.initializer == null) {
       return null;
     } else {
       return _initializer ??= new FunctionElementForLink_Initializer(this);
     }
   }
 
   @override
   bool get isConst => unlinkedVariable.isConst;
 
   @override
@@ skipping 37 matching lines @@
    * there are no type parameters in scope.
    */
   TypeParameterizedElementMixin get _typeParameterContext;
 
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 
   @override
   String toString() => '$enclosingElement.$name';
 }