Sort class IDs before training AppJIT snapshots

runtime/include/dart_api.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 RUNTIME_INCLUDE_DART_API_H_
 #define RUNTIME_INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 3261 matching lines @@
                                  intptr_t* vm_snapshot_data_size,
                                  uint8_t** vm_snapshot_instructions_buffer,
                                  intptr_t* vm_snapshot_instructions_size,
                                  uint8_t** isolate_snapshot_data_buffer,
                                  intptr_t* isolate_snapshot_data_size,
                                  uint8_t** isolate_snapshot_instructions_buffer,
                                  intptr_t* isolate_snapshot_instructions_size);
 
 
 /**
+ * Sorts the class-ids in depth first traversal order of the inheritance
+ * tree.  This is a costly operation, but it can make method dispatch
+ * more efficient and is done before writing snapshots.
+ */
+DART_EXPORT void Dart_SortClasses();
+
+
+/**
  *  Creates a snapshot that caches compiled code and type feedback for faster
  *  startup and quicker warmup in a subsequent process.
  *
  *  Outputs a snapshot in two pieces. The pieces should be passed to
  *  Dart_CreateIsolate in a VM using the same VM snapshot pieces used in the
  *  current VM. The instructions piece must be loaded with read and execute
  *  permissions; the data piece may be loaded as read-only.
  *
  *   - Requires the VM to have been started with --load-deferred-eagerly.
  *   - Requires the VM to have not been started with --precompilation.
@@ skipping 22 matching lines @@
  */
 DART_EXPORT bool Dart_IsPrecompiledRuntime();
 
 
 /**
  *  Print a native stack trace. Used for crash handling.
  */
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context);
 
 #endif /* INCLUDE_DART_API_H_ */ /* NOLINT */