Create frequently used symbols in the vm isolate

vm/isolate.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_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/class_table.h"
@@ skipping 167 matching lines @@
   void set_ast_node_id(int value) { ast_node_id_ = value; }
 
   intptr_t computation_id() const { return computation_id_; }
   void set_computation_id(int value) { computation_id_ = value; }
 
   RawArray* ic_data_array() const { return ic_data_array_; }
   void set_ic_data_array(RawArray* value) { ic_data_array_ = value; }
 
   Debugger* debugger() const { return debugger_; }
 
+  GcPrologueCallbacks& gc_prologue_callbacks() {
+    return gc_prologue_callbacks_;
+  }
+
+  GcEpilogueCallbacks& gc_epilogue_callbacks() {
+    return gc_epilogue_callbacks_;
+  }
+
   static void SetCreateCallback(Dart_IsolateCreateCallback cb) {
     create_callback_ = cb;
   }
   static Dart_IsolateCreateCallback CreateCallback() {
     return create_callback_;
   }
 
   static void SetInterruptCallback(Dart_IsolateInterruptCallback cb) {
     interrupt_callback_ = cb;
   }
   static Dart_IsolateInterruptCallback InterruptCallback() {
     return interrupt_callback_;
   }
 
   static void SetShutdownCallback(Dart_IsolateShutdownCallback cb) {
     shutdown_callback_ = cb;
   }
   static Dart_IsolateShutdownCallback ShutdownCallback() {
     return shutdown_callback_;
   }
 
-  GcPrologueCallbacks& gc_prologue_callbacks() {
-    return gc_prologue_callbacks_;
-  }
-
-  GcEpilogueCallbacks& gc_epilogue_callbacks() {
-    return gc_epilogue_callbacks_;
-  }
-
  private:
   Isolate();
 
   void BuildName(const char* name_prefix);
   void PrintInvokedFunctions();
 
   static uword GetSpecifiedStackSize();
 
   static const intptr_t kStackSizeBuffer = (16 * KB);
 
@@ skipping 94 matching lines @@
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
   uword saved_stack_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SwitchIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_