Replace deopt stubs location/register shuffling with using deopt-info.

runtime/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 204 matching lines @@
 
   static void SetShutdownCallback(Dart_IsolateShutdownCallback cb) {
     shutdown_callback_ = cb;
   }
   static Dart_IsolateShutdownCallback ShutdownCallback() {
     return shutdown_callback_;
   }
 
   intptr_t* deopt_registers_copy() const { return deopt_registers_copy_; }
   void set_deopt_registers_copy(intptr_t* value) {
+    ASSERT((value == NULL) || (deopt_registers_copy_ == NULL));
     deopt_registers_copy_ = value;
   }
   intptr_t* deopt_frame_copy() const { return deopt_frame_copy_; }
   void SetDeoptFrameCopy(intptr_t* value, intptr_t size) {
     ASSERT((value == NULL) || (size > 0));
+    ASSERT((value == NULL) || (deopt_frame_copy_ == NULL));
     deopt_frame_copy_ = value;
     deopt_frame_copy_size_ = size;
   }
   intptr_t deopt_frame_copy_size() const { return deopt_frame_copy_size_; }
 
  private:
   Isolate();
 
   void BuildName(const char* name_prefix);
   void PrintInvokedFunctions();
@@ skipping 102 matching lines @@
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
   uword saved_stack_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SwitchIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_