Memory leak fix. Use correct analysis context for annotation constants.

pkg/analyzer/lib/src/generated/constant.dart

Index: pkg/analyzer/lib/src/generated/constant.dart
diff --git a/pkg/analyzer/lib/src/generated/constant.dart b/pkg/analyzer/lib/src/generated/constant.dart
index 5a3f445a88663d845a7ece8f9f7e73be88c1c5ba..aca4af5bfef2141dec78546b3ae60825e23d87ed 100644
--- a/pkg/analyzer/lib/src/generated/constant.dart
+++ b/pkg/analyzer/lib/src/generated/constant.dart
@@ -1234,8 +1234,9 @@ class ConstantFinder extends RecursiveAstVisitor<Object> {
   @override
   Object visitAnnotation(Annotation node) {
     super.visitAnnotation(node);
+    AnalysisContext owningContext = _getOwningContext();
     constantsToCompute.add(new ConstantEvaluationTarget_Annotation(
-        context, source, librarySource, node));
+        owningContext, source, librarySource, node));
     return null;
   }
 
@@ -1285,6 +1286,14 @@ class ConstantFinder extends RecursiveAstVisitor<Object> {
     }
     return null;
   }
+
+  AnalysisContext _getOwningContext() {
+    if (context is InternalAnalysisContext) {
+      InternalAnalysisContext internalContext = context;
+      return internalContext.getContextFor(librarySource);
+    }
+    return context;
+  }
 }
 
 /**