Add export dependencies to Kernel libraries and use them to resynthesize ExportElement(s) in Analyz…

pkg/front_end/lib/src/fasta/source/source_loader.dart

 // Copyright (c) 2016, 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.
 
 library fasta.source_loader;
 
 import 'dart:async' show Future;
 
 import 'dart:typed_data' show Uint8List;
 
@@ skipping 199 matching lines @@
           exporters.add(exporter.exporter);
         }
       }
     });
     Set<SourceLibraryBuilder> both = new Set<SourceLibraryBuilder>();
     for (LibraryBuilder exported in exportees) {
       if (exporters.contains(exported)) {
         both.add(exported);
       }
       for (Export export in exported.exporters) {
-        exported.exports.forEach(export.addToExportScope);
+        exported.exportScope.forEach(export.addToExportScope);
       }
     }
     bool wasChanged = false;
     do {
       wasChanged = false;
       for (SourceLibraryBuilder exported in both) {
         for (Export export in exported.exporters) {
           SourceLibraryBuilder exporter = export.exporter;
-          exported.exports.forEach((String name, Builder member) {
+          exported.exportScope.forEach((String name, Builder member) {
             if (exporter.addToExportScope(name, member)) {
               wasChanged = true;
             }
           });
         }
       }
     } while (wasChanged);
     builders.forEach((Uri uri, LibraryBuilder library) {
       if (library is SourceLibraryBuilder) {
         library.addImportsToScope();
       }
     });
     ticker.logMs("Computed library scopes");
     // debugPrintExports();
   }
 
   void debugPrintExports() {
     // TODO(sigmund): should be `covarint SourceLibraryBuilder`.
     builders.forEach((Uri uri, dynamic l) {
       SourceLibraryBuilder library = l;
       Set<Builder> members = new Set<Builder>();
       library.forEach((String name, Builder member) {
         while (member != null) {
           members.add(member);
           member = member.next;
         }
       });
       List<String> exports = <String>[];
-      library.exports.forEach((String name, Builder member) {
+      library.exportScope.forEach((String name, Builder member) {
         while (member != null) {
           if (!members.contains(member)) {
             exports.add(name);
           }
           member = member.next;
         }
       });
       if (exports.isNotEmpty) {
         print("$uri exports $exports");
       }
@@ skipping 264 matching lines @@
   Expression throwCompileConstantError(Expression error) {
     return target.backendTarget.throwCompileConstantError(coreTypes, error);
   }
 
   Expression buildCompileTimeError(Message message, int offset, Uri uri) {
     String text = target.context
         .format(message.withLocation(uri, offset), Severity.error);
     return target.backendTarget.buildCompileTimeError(coreTypes, text, offset);
   }
 }