Visit Node in CompileTimeConstantAnalyzer only if Node based

compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java

Index: compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java b/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
index 67de701798c514817cd5209802dd564dd6b86267..29de8029aacb5b77dcec4bf85562cf2ddadec984 100644
--- a/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
+++ b/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
@@ -12,13 +12,14 @@ import com.google.dart.compiler.ast.Modifiers;
 import com.google.dart.compiler.common.SourceInfo;
 import com.google.dart.compiler.type.Type;
 
-class FieldElementImplementation extends AbstractElement implements FieldElement {
+class FieldElementImplementation extends AbstractNodeElement implements FieldElement, HasConstantTypeSetter {
   private final EnclosingElement holder;
   private final SourceInfo nameLocation;
   private Modifiers modifiers;
   private Type type;
   private MethodElement getter;
   private MethodElement setter;
+  private Type constantType;
 
   FieldElementImplementation(DartNode node,
       SourceInfo nameLocation,
@@ -103,4 +104,14 @@ class FieldElementImplementation extends AbstractElement implements FieldElement
   void setSetter(MethodElement setter) {
     this.setter = setter;
   }
+  
+  @Override
+  public Type getConstantType() {
+    return constantType;
+  }
+  
+  @Override
+  public void setConstantType(Type type) {
+    constantType = type;
+  }
 }