Move vm_tags from isolate to thread, since we may have multiple threads in same isolate (GC, backgr…

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 220 matching lines @@
   // DEPRECATED: Use Thread's methods instead. During migration, these default
   // to using the mutator thread.
   // NOTE: These are also used by the profiler.
   uword top_exit_frame_info() const {
     return mutator_thread_->top_exit_frame_info();
   }
   void set_top_exit_frame_info(uword value) {
     mutator_thread_->set_top_exit_frame_info(value);
   }
 
-  uword vm_tag() const {
-    return vm_tag_;
-  }
-  void set_vm_tag(uword tag) {
-    vm_tag_ = tag;
-  }
-  static intptr_t vm_tag_offset() {
-    return OFFSET_OF(Isolate, vm_tag_);
-  }
-
   ApiState* api_state() const { return api_state_; }
   void set_api_state(ApiState* value) { api_state_ = value; }
 
   void set_init_callback_data(void* value) {
     init_callback_data_ = value;
   }
   void* init_callback_data() const {
     return init_callback_data_;
   }
 
@@ skipping 876 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_