Move Compiler.libraries to LibraryLoader.

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 1175 matching lines @@
     emitter.assembleProgram();
     int totalMethodCount = generatedCode.length;
     if (totalMethodCount != preMirrorsMethodCount) {
       int mirrorCount = totalMethodCount - preMirrorsMethodCount;
       double percentage = (mirrorCount / totalMethodCount) * 100;
       compiler.reportHint(
           compiler.mainApp, MessageKind.MIRROR_BLOAT,
           {'count': mirrorCount,
            'total': totalMethodCount,
            'percentage': percentage.round()});
-      for (LibraryElement library in compiler.libraries.values) {
+      for (LibraryElement library in compiler.libraryLoader.libraries) {
         if (library.isInternalLibrary) continue;
         for (LibraryTag tag in library.tags) {
           Import importTag = tag.asImport();
           if (importTag == null) continue;
           LibraryElement importedLibrary = library.getLibraryFromTag(tag);
           if (importedLibrary != compiler.mirrorsLibrary) continue;
           MessageKind kind =
               compiler.mirrorUsageAnalyzerTask.hasMirrorUsage(library)
               ? MessageKind.MIRROR_IMPORT
               : MessageKind.MIRROR_IMPORT_NO_USAGE;
@@ skipping 710 matching lines @@
       // reflection. If there is no mirror-usage these are probably not
       // necessary, but the backend relies on them being resolved.
       enqueuer.enqueueReflectiveStaticFields(_findStaticFieldTargets());
     }
 
     if (mustPreserveNames) compiler.log('Preserving names.');
 
     if (mustRetainMetadata) {
       compiler.log('Retaining metadata.');
 
-      compiler.libraries.values.forEach(retainMetadataOf);
+      compiler.libraryLoader.libraries.forEach(retainMetadataOf);
       for (Dependency dependency in metadataConstants) {
         registerCompileTimeConstant(
             dependency.constant, dependency.registry);
       }
       metadataConstants.clear();
     }
   }
 
   void onElementResolved(Element element, TreeElements elements) {
     LibraryElement library = element.library;
@@ skipping 55 matching lines @@
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final Constant constant;
   // TODO(johnniwinther): Change to [Element] when dependency nodes are added.
   final Registry registry;
 
   const Dependency(this.constant, this.registry);
 }