Introduce .isMalformed

pkg/compiler/lib/src/dart_backend/renamer.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 dart_backend;
 
 Comparator get _compareNodes =>
     compareBy((n) => n.getBeginToken().charOffset);
 
 abstract class Renamable implements Comparable {
@@ skipping 117 matching lines @@
 
   String _renameConstructor(ConstructorPlaceholder placeholder) {
     String name = placeholder.element.name;
     if (name == '') return "";
     String result = _renameGlobal(placeholder.element);
     return result;
   }
 
   String _renameGlobal(Entity entity) {
     assert(entity is! Element ||
-           Elements.isErroneous(entity) ||
+           Elements.isMalformed(entity) ||
            Elements.isStaticOrTopLevel(entity) ||
            entity is TypeVariableElement);
     // TODO(smok): We may want to reuse class static field and method names.
     if (entity is Element) {
       LibraryElement library = entity.library;
       if (reexportingLibraries.containsKey(entity)) {
         library = reexportingLibraries[entity];
       }
       if (library.isPlatformLibrary) {
         // TODO(johnniwinther): Handle prefixes for dart:core.
@@ skipping 217 matching lines @@
   MinifyingGenerator();
 
   String generate(String originalName, bool isForbidden(String name)) {
     String result;
     do {
       result = generateMiniId(index++);
     } while (isForbidden(result));
     return result;
   }
 }