Support serialization of WorldImpact

pkg/compiler/lib/src/patch_parser.dart

Index: pkg/compiler/lib/src/patch_parser.dart
diff --git a/pkg/compiler/lib/src/patch_parser.dart b/pkg/compiler/lib/src/patch_parser.dart
index 593b08fb43519d980fbc981ed080fe4cca2b395c..fd747e9e57189806de2819bd4d9e01455e4e63c9 100644
--- a/pkg/compiler/lib/src/patch_parser.dart
+++ b/pkg/compiler/lib/src/patch_parser.dart
@@ -463,7 +463,7 @@ class NativeAnnotationHandler implements EagerAnnotationHandler<String> {
       String native = getNativeAnnotation(annotation);
       if (native != null) {
         JavaScriptBackend backend = compiler.backend;
-        backend.setNativeClassTagInfo(element, native);
+        backend.nativeData.setNativeClassTagInfo(element, native);
         return native;
       }
     }
@@ -496,7 +496,7 @@ class JsInteropAnnotationHandler implements EagerAnnotationHandler<bool> {
     bool hasJsInterop = hasJsNameAnnotation(annotation);
     if (hasJsInterop) {
       JavaScriptBackend backend = compiler.backend;
-      backend.markAsJsInterop(element);
+      backend.nativeData.markAsJsInterop(element);
     }
     // Due to semantics of apply in the baseclass we have to return null to
     // indicate that no match was found.