Use PassiveObject were possible.

runtime/vm/deopt_instructions.cc

 // 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.
 
 #include "vm/deopt_instructions.h"
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/intermediate_language.h"
 #include "vm/locations.h"
@@ skipping 320 matching lines @@
   }
 
   return deopt_arg_count;
 }
 
 
 RawArray* DeoptContext::DestFrameAsArray() {
   ASSERT(dest_frame_ != NULL && dest_frame_is_allocated_);
   const Array& dest_array =
       Array::Handle(Array::New(dest_frame_size_));
-  Object& obj = Object::Handle();
+  PassiveObject& obj = PassiveObject::Handle();

[Ivan Posva, 2014/08/28 19:31:53]

Handle(isolate())

[siva, 2014/08/29 00:17:01]

Done.

   for (intptr_t i = 0; i < dest_frame_size_; i++) {
     obj = reinterpret_cast<RawObject*>(dest_frame_[i]);
     dest_array.SetAt(i, obj);
   }
   return dest_array.raw();
 }
 
 
 // Deoptimization instruction creating return address using function and
 // deopt-id stored at 'object_table_index'.
@@ skipping 72 matching lines @@
 
   virtual intptr_t source_index() const { return object_table_index_; }
   virtual DeoptInstr::Kind kind() const { return kConstant; }
 
   virtual const char* ArgumentsToCString() const {
     return Isolate::Current()->current_zone()->PrintToString(
         "%" Pd "", object_table_index_);
   }
 
   void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
-    const Object& obj = Object::Handle(
+    const PassiveObject& obj = PassiveObject::Handle(
         deopt_context->isolate(), deopt_context->ObjectAt(object_table_index_));
     *reinterpret_cast<RawObject**>(dest_addr) = obj.raw();
   }
 
  private:
   const intptr_t object_table_index_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptConstantInstr);
 };
 
@@ skipping 891 matching lines @@
                           Smi* offset,
                           DeoptInfo* info,
                           Smi* reason) {
   intptr_t i = index * kEntrySize;
   *offset ^= table.At(i);
   *info ^= table.At(i + 1);
   *reason ^= table.At(i + 2);
 }
 
 }  // namespace dart