Use CHECK_ISOLATE instead of DARTSCOPE for Dart_GetNativeInstanceField after

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 12105 matching lines @@
     return Instance::null();
   }
   intptr_t instance_size = cls.instance_size();
   ASSERT(instance_size > 0);
   RawObject* raw = Object::Allocate(cls.id(), instance_size, space);
   return reinterpret_cast<RawInstance*>(raw);
 }
 
 
 bool Instance::IsValidFieldOffset(intptr_t offset) const {
-  const Class& cls = Class::Handle(clazz());
+  Isolate* isolate = Isolate::Current();
+  REUSABLE_CLASS_HANDLESCOPE(isolate);
+  Class& cls = isolate->ClassHandle();
+  cls = clazz();
   return (offset >= 0 && offset <= (cls.instance_size() - kWordSize));
 }
 
 
 const char* Instance::ToCString() const {
   if (IsNull()) {
     return "null";
   } else if (raw() == Object::sentinel().raw()) {
     return "sentinel";
   } else if (raw() == Object::transition_sentinel().raw()) {
@@ skipping 5444 matching lines @@
   return "_MirrorReference";
 }
 
 
 void MirrorReference::PrintToJSONStream(JSONStream* stream, bool ref) const {
   Instance::PrintToJSONStream(stream, ref);
 }
 
 
 }  // namespace dart