Prepare for development branch by updating externally-used API.

pkg/front_end/lib/src/incremental_kernel_generator_impl.dart

Index: pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
diff --git a/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart b/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
index 05e88e2a392f24d2618374ace8f9a5bb9c041adf..e1113c1c4a7db0b246ff457f0f8a3ec8a91c317e 100644
--- a/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
+++ b/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
@@ -246,7 +246,7 @@ class IncrementalKernelGeneratorImpl implements IncrementalKernelGenerator {
         FileState file = uriToFile[library.uri];
         for (NamespaceExport export in file.exports) {
           DillLibraryBuilder exportedLibrary =
-              dillTarget.loader.read(export.library.uri);
+              dillTarget.loader.read(export.library.uri, -1, accessor: library);
           if (exportedLibrary != null) {
             exportedLibrary.exports.forEach((name, member) {
               if (export.isExposed(name) &&