Add summary support for ConstructorElement.nameEnd and .periodOffset.

pkg/analyzer/test/src/summary/resynthesize_test.dart

Index: pkg/analyzer/test/src/summary/resynthesize_test.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_test.dart b/pkg/analyzer/test/src/summary/resynthesize_test.dart
index 3e9ef568ced4ccca8f118310d6a1ca62024b94a5..30ae9fea77be75bf35915d5517e40ca420565ae9 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_test.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_test.dart
@@ -492,6 +492,8 @@ class ResynthTest extends ResolverTestCase {
           original.redirectedConstructor, '$desc redirectedConstructor');
     }
     checkPossibleMember(resynthesized, original, desc);
+    expect(resynthesized.nameEnd, original.nameEnd, reason: desc);
+    expect(resynthesized.periodOffset, original.periodOffset, reason: desc);
   }
 
   void compareConstValues(