js: fix core.Object, output order, static const fields

lib/src/codegen/code_generator.dart

Index: lib/src/codegen/code_generator.dart
diff --git a/lib/src/codegen/code_generator.dart b/lib/src/codegen/code_generator.dart
index c2920c49d109abc1ccbd74064bab522ebcb0b310..dcc63026ca84d7baac1cd1a455aa9cbd27638e6b 100644
--- a/lib/src/codegen/code_generator.dart
+++ b/lib/src/codegen/code_generator.dart
@@ -132,6 +132,6 @@ abstract class CodeGenerator {
   /// Return a hash, if any, that can be used for caching purposes. When two
   /// invocations to this function return the same hash, the underlying
   /// code-generator generated the same code.
-  String generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
-      CheckerReporter reporter);
+  String generateLibrary(
+      LibraryUnit unit, LibraryInfo info, CheckerReporter reporter);
 }