Revert "Remove Registry from registerMetadataConstant" and "Serialize metadata"

pkg/compiler/lib/src/resolution/registry.dart

Index: pkg/compiler/lib/src/resolution/registry.dart
diff --git a/pkg/compiler/lib/src/resolution/registry.dart b/pkg/compiler/lib/src/resolution/registry.dart
index e52b185806e9a9ab8026a9025ab75af452da5ba4..54bd4959ed0d24ebd4572fc3ceeb38438fe8f9bf 100644
--- a/pkg/compiler/lib/src/resolution/registry.dart
+++ b/pkg/compiler/lib/src/resolution/registry.dart
@@ -334,6 +334,10 @@ class ResolutionRegistry extends Registry {
     worldImpact.registerStaticUse(staticUse);
   }
 
+  void registerMetadataConstant(MetadataAnnotation metadata) {
+    backend.registerMetadataConstant(metadata, metadata.annotatedElement, this);
+  }
+
   /// Register the use of a type.
   void registerTypeUse(TypeUse typeUse) {
     worldImpact.registerTypeUse(typeUse);