Replace linked list of loaded libraries

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1755 matching lines @@
     return raw_ptr()->native_entry_resolver_;
   }
   void set_native_entry_resolver(Dart_NativeEntryResolver value) const {
     raw_ptr()->native_entry_resolver_ = value;
   }
 
   RawString* PrivateName(const String& name) const;
 
   void Register() const;
 
-  RawLibrary* next_registered() const { return raw_ptr()->next_registered_; }
-
   RawString* DuplicateDefineErrorString(const String& entry_name,
                                         const Library& conflicting_lib) const;
   static RawLibrary* LookupLibrary(const String& url);
+  static RawLibrary* GetLibrary(intptr_t index);
   static RawString* CheckForDuplicateDefinition();
   static bool IsKeyUsed(intptr_t key);
 
   static void InitCoreLibrary(Isolate* isolate);
   static void InitMathLibrary(Isolate* isolate);
   static void InitIsolateLibrary(Isolate* isolate);
   static void InitMirrorsLibrary(Isolate* isolate);
   static RawLibrary* CoreLibrary();
   static RawLibrary* CoreImplLibrary();
   static RawLibrary* MathLibrary();
@@ skipping 3157 matching lines @@
 }
 
 
 intptr_t Stackmap::SizeInBits() const {
   return (Smi::Value(raw_ptr()->bitmap_size_in_bytes_) * kBitsPerByte);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_