Reapply "Move megamorphic cache table into the Dart heap."

runtime/vm/isolate.h

 // Copyright (c) 2013, 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/atomic.h"
@@ skipping 127 matching lines @@
 
   StoreBuffer* store_buffer() { return store_buffer_; }
 
   ThreadRegistry* thread_registry() { return thread_registry_; }
 
   ClassTable* class_table() { return &class_table_; }
   static intptr_t class_table_offset() {
     return OFFSET_OF(Isolate, class_table_);
   }
 
-  MegamorphicCacheTable* megamorphic_cache_table() {
-    return &megamorphic_cache_table_;
-  }
-
   Dart_MessageNotifyCallback message_notify_callback() const {
     return message_notify_callback_;
   }
   void set_message_notify_callback(Dart_MessageNotifyCallback value) {
     message_notify_callback_ = value;
   }
 
   // Limited public access to BaseIsolate::mutator_thread_ for code that
   // must treat the mutator as the default or a special case. Prefer code
   // that works uniformly across all threads.
@@ skipping 646 matching lines @@
 #if defined(DEBUG)
   bool IsIsolateOf(Thread* thread);
 #endif  // DEBUG
 
   template<class T> T* AllocateReusableHandle();
 
   uword vm_tag_;
   StoreBuffer* store_buffer_;
   ThreadRegistry* thread_registry_;
   ClassTable class_table_;
-  MegamorphicCacheTable megamorphic_cache_table_;
   Dart_MessageNotifyCallback message_notify_callback_;
   char* name_;
   char* debugger_name_;
   int64_t start_time_;
   Dart_Port main_port_;
   Dart_Port origin_id_;  // Isolates created by spawnFunc have some origin id.
   uint64_t pause_capability_;
   uint64_t terminate_capability_;
   bool errors_fatal_;
   Heap* heap_;
@@ skipping 291 matching lines @@
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   Isolate::Flags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_