Add NosafepointScope and remove comment.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 8513 matching lines @@
 RawClass* Object::clazz() const {
   uword raw_value = reinterpret_cast<uword>(raw_);
   if ((raw_value & kSmiTagMask) == kSmiTag) {
     return Smi::Class();
   }
   return Isolate::Current()->class_table()->At(raw()->GetClassId());
 }
 
 
 DART_FORCE_INLINE void Object::SetRaw(RawObject* value) {
-  // NOTE: The assignment "raw_ = value" should be the first statement in
-  // this function. Also do not use 'value' in this function after the
-  // assignment (use 'raw_' instead).
+  NoSafepointScope no_safepoint_scope;
   raw_ = value;
   if ((reinterpret_cast<uword>(value) & kSmiTagMask) == kSmiTag) {
     set_vtable(Smi::handle_vtable_);
     return;
   }
   intptr_t cid = value->GetClassId();
   // Free-list elements cannot be wrapped in a handle.
   ASSERT(cid != kFreeListElement);
   ASSERT(cid != kForwardingCorpse);
   if (cid >= kNumPredefinedCids) {
@@ skipping 186 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_