Share LibrarySpecificUnits when possible

pkg/analyzer/lib/src/context/cache.dart

Index: pkg/analyzer/lib/src/context/cache.dart
diff --git a/pkg/analyzer/lib/src/context/cache.dart b/pkg/analyzer/lib/src/context/cache.dart
index 1f0f42c9d06c24dba51ff510fe80b15bd02e2a34..a1c2aff02f9240af0a8f34cb02913dfc3f6b487b 100644
--- a/pkg/analyzer/lib/src/context/cache.dart
+++ b/pkg/analyzer/lib/src/context/cache.dart
@@ -14,6 +14,7 @@ import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_collection.dart';
 import 'package:analyzer/src/task/model.dart';
+import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/model.dart';
 
 /**
@@ -313,6 +314,13 @@ class CacheEntry {
   final AnalysisTarget target;
 
   /**
+   * A library specific unit associated with the target if the target is a
+   * [Source], or `null` if the target is not a [Source] or if a library
+   * specific unit for the source has not yet been computed.
+   */
+  LibrarySpecificUnit librarySpecificUnit;
+
+  /**
    * The partition that is responsible for this entry.
    */
   CachePartition _partition;
@@ -1101,7 +1109,8 @@ abstract class CachePartition {
    */
   void resultAccessed(AnalysisTarget target, ResultDescriptor descriptor) {
     CacheFlushManager flushManager = _getFlushManager(descriptor);
-    TargetedResult result = new TargetedResult(target, descriptor);
+    TargetedResult result =
+        new TargetedResult(context.canonicalizeTarget(target), descriptor);
     flushManager.resultAccessed(result);
   }