Make room for laziness in the Annotations interface

compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorSerializer.java

@@ -431,7 +431,7 @@ public class DescriptorSerializer {
     }
 
     private static boolean hasAnnotations(Annotated descriptor) {
-        return !descriptor.getAnnotations().getAnnotationDescriptors().isEmpty();
+        return !descriptor.getAnnotations().isEmpty();
     }
 
     @NotNull

compiler/frontend/src/org/jetbrains/jet/lang/resolve/DeclarationResolver.java

@@ -155,7 +155,7 @@ public class DeclarationResolver {
             if (modifierList != null) {
                 MutableClassDescriptor descriptor = entry.getValue();
                 descriptor.addAnnotations(annotationResolver.resolveAnnotationsWithoutArguments(
-                        descriptor.getScopeForSupertypeResolution(), modifierList, trace).getAnnotationDescriptors());
+                        descriptor.getScopeForSupertypeResolution(), modifierList, trace));
             }
         }
     }