VM: Use current isolate as immediate in per-isolate stubs.

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/base_isolate.h"
@@ skipping 96 matching lines @@
   V(TypeParameter)                                                             \
 
 class Isolate : public BaseIsolate {
  public:
   ~Isolate();
 
   static inline Isolate* Current() {
     return reinterpret_cast<Isolate*>(Thread::GetThreadLocal(isolate_key));
   }
 
+  static inline uword CurrentAddress() {

[Ivan Posva, 2014/09/18 17:31:12]

This is a rather unfortunate name as the function does not return the address of
Current (see Scavenger::TopAddress for an example).

I will rename this to CurrentAsWord() if we need it.

+    return reinterpret_cast<uword>(Current());
+  }
+
   static void SetCurrent(Isolate* isolate);
 
   static void InitOnce();
   static Isolate* Init(const char* name_prefix);
   void Shutdown();
 
   Isolate* ShallowCopy();
 
   // Register a newly introduced class.
   void RegisterClass(const Class& cls);
@@ skipping 718 matching lines @@
   char* exception_callback_name_;
   uint8_t* serialized_args_;
   intptr_t serialized_args_len_;
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_