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

lib/src/codegen/dart_codegen.dart

Index: lib/src/codegen/dart_codegen.dart
diff --git a/lib/src/codegen/dart_codegen.dart b/lib/src/codegen/dart_codegen.dart
index 3fa931bcf087c67a44c747c0a8eeda042eed5cdc..a25b9e21992822bc6c61c1b321eebf4f6b40ad2d 100644
--- a/lib/src/codegen/dart_codegen.dart
+++ b/lib/src/codegen/dart_codegen.dart
@@ -435,28 +435,23 @@ class DartGenerator extends codegenerator.CodeGenerator {
     out.finalize();
   }
 
-  void _generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
-      CheckerReporter reporter) {
+  void _generateLibrary(
+      LibraryUnit unit, LibraryInfo info, CheckerReporter reporter) {
     doOne(unit) {
       var outputDir = makeOutputDirectory(info, unit);
       reporter.enterSource(unit.element.source);
       generateUnit(unit, info, outputDir);
       reporter.leaveSource();
     }
-    isLib(unit) => unit.directives.any((d) => d is LibraryDirective);
-    isNotLib(unit) => !isLib(unit);
-    var libs = units.where(isLib);
-    var parts = units.where(isNotLib);
-    assert(libs.length == 1 || (libs.length == 0 && parts.length == 1));
-    parts.forEach(doOne);
-    libs.forEach(doOne);
+    unit.parts.forEach(doOne);
+    doOne(unit.library);
   }
 
-  String generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
-      CheckerReporter reporter) {
+  String generateLibrary(
+      LibraryUnit unit, LibraryInfo info, CheckerReporter reporter) {
     _vm = new reifier.VariableManager();
     _extraImports = new Set<LibraryElement>();
-    _generateLibrary(units, info, reporter);
+    _generateLibrary(unit, info, reporter);
     _extraImports = null;
     _vm = null;
     return null;
@@ -486,9 +481,9 @@ class EmptyDartGenerator extends codegenerator.CodeGenerator {
   EmptyDartGenerator(String outDir, Uri root, TypeRules rules, this.options)
       : super(outDir, root, rules);
 
-  String generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
-      CheckerReporter reporter) {
-    for (var unit in units) {
+  String generateLibrary(
+      LibraryUnit library, LibraryInfo info, CheckerReporter reporter) {
+    for (var unit in library.units) {
       var outputDir = makeOutputDirectory(info, unit);
       reporter.enterSource(unit.element.source);
       generateUnit(unit, info, outputDir);