Begin making copies of AST nodes for constants during resolution.

pkg/analyzer/lib/src/generated/testing/element_factory.dart

Index: pkg/analyzer/lib/src/generated/testing/element_factory.dart
diff --git a/pkg/analyzer/lib/src/generated/testing/element_factory.dart b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
index 9fab12ff89342406125ec4b9db39a4f18c0efd55..ebb0713f1436ec917b3d9685374e4314ba8f815f 100644
--- a/pkg/analyzer/lib/src/generated/testing/element_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
@@ -70,10 +70,6 @@ class ElementFactory {
           [List<String> parameterNames]) =>
       classElement(typeName, objectType, parameterNames);
 
-  static ClassElementImpl classTypeAlias2(String typeName,
-          [List<String> parameterNames]) =>
-      classTypeAlias(typeName, objectType, parameterNames);
-
   static classTypeAlias(String typeName, InterfaceType superclassType,
       [List<String> parameterNames]) {
     ClassElementImpl element =
@@ -82,6 +78,10 @@ class ElementFactory {
     return element;
   }
 
+  static ClassElementImpl classTypeAlias2(String typeName,
+          [List<String> parameterNames]) =>
+      classTypeAlias(typeName, objectType, parameterNames);
+
   static CompilationUnitElementImpl compilationUnit(String fileName) {
     Source source = new NonExistingSource(fileName, UriKind.FILE_URI);
     CompilationUnitElementImpl unit = new CompilationUnitElementImpl(fileName);
@@ -89,6 +89,9 @@ class ElementFactory {
     return unit;
   }
 
+  static ConstLocalVariableElementImpl constLocalVariableElement(String name) =>
+      new ConstLocalVariableElementImpl(name, 0);
+
   static ConstructorElementImpl constructorElement(
       ClassElement definingClass, String name, bool isConst,
       [List<DartType> argumentTypes]) {