Start separating ClassElementImpl for Class and Enum.

pkg/analyzer/lib/src/summary/resynthesize.dart

Index: pkg/analyzer/lib/src/summary/resynthesize.dart
diff --git a/pkg/analyzer/lib/src/summary/resynthesize.dart b/pkg/analyzer/lib/src/summary/resynthesize.dart
index 034aa0b782803e9ccbae76c0b2598d76cdb5a9e7..84fbcdea443b62635fe6959bd0da22cf1704c849 100644
--- a/pkg/analyzer/lib/src/summary/resynthesize.dart
+++ b/pkg/analyzer/lib/src/summary/resynthesize.dart
@@ -1757,7 +1757,7 @@ class _UnitResynthesizer {
   ClassElementImpl buildClassImpl(
       UnlinkedClass serializedClass, ClassElementHandle handle) {
     ClassElementImpl classElement =
-        new ClassElementImpl.forSerialized(serializedClass, unit);
+        new ClassElementImpl_Class.forSerialized(serializedClass, unit);
     classElement.hasBeenInferred = summaryResynthesizer.strongMode;
     InterfaceTypeImpl correspondingType =
         new InterfaceTypeImpl(handle ?? classElement);
@@ -1780,12 +1780,6 @@ class _UnitResynthesizer {
     return classElement;
   }
 
-  void buildCodeRange(ElementImpl element, CodeRange codeRange) {
-    if (codeRange != null) {
-      element.setCodeRange(codeRange.offset, codeRange.length);
-    }
-  }
-
   /**
    * Resynthesize a [ConstructorElement] and place it in the given [holder].
    * [classElement] is the element of the class for which this element is a
@@ -1890,15 +1884,11 @@ class _UnitResynthesizer {
    */
   void buildEnum(UnlinkedEnum serializedEnum) {
     assert(!libraryResynthesizer.isCoreLibrary);
-    ClassElementImpl classElement =
-        new ClassElementImpl(serializedEnum.name, serializedEnum.nameOffset);
-    classElement.enum2 = true;
+    ClassElementImpl_Enum classElement =
+        new ClassElementImpl_Enum.forSerialized(serializedEnum, unit);
     InterfaceType enumType = new InterfaceTypeImpl(classElement);
     classElement.type = enumType;
     classElement.supertype = typeProvider.objectType;
-    buildDocumentation(classElement, serializedEnum.documentationComment);
-    buildAnnotations(classElement, serializedEnum.annotations);
-    buildCodeRange(classElement, serializedEnum.codeRange);
     ElementHolder memberHolder = new ElementHolder();
     // Build the 'index' field.
     FieldElementImpl indexField = new FieldElementImpl('index', -1);