Ensure resolution of metadata on parts for serialization.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 189c7d0db64b2e6016740093f1cc643d770940cb..3c9fc1c54ac4d3da937c5bf8650ac782a642dd48 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -913,6 +913,11 @@ abstract class Compiler implements LibraryLoaderListener {
         metadata.ensureResolved(resolution);
       }
     });
+    library.compilationUnits.forEach((CompilationUnitElement unit) {

[Siggi Cherem (dart-lang), 2016/08/18 15:30:58]

same here - guard to only do this when serialization is enabeld?

[Johnni Winther, 2016/08/19 08:57:17]

Done.

+      for (MetadataAnnotation metadata in unit.metadata) {
+        metadata.ensureResolved(resolution);
+      }
+    });
   }
 
   void fullyEnqueueTopLevelElement(Element element, Enqueuer world) {