Add NoSafepointScope to ObjectPointerVisitor.

runtime/vm/raw_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/raw_object.h"
 
 #include "vm/class_table.h"
 #include "vm/dart.h"
 #include "vm/freelist.h"
 #include "vm/isolate.h"
@@ skipping 213 matching lines @@
 void RawObject::ValidateOverwrittenSmi(RawSmi* raw) {
   if (FLAG_validate_overwrite && raw->IsHeapObject() && raw != Object::null()) {
     FATAL1("Expected smi/null, found: %" Px "\n", reinterpret_cast<uword>(raw));
   }
 }
 #endif  // DEBUG
 
 
 intptr_t RawObject::VisitPointers(ObjectPointerVisitor* visitor) {
   intptr_t size = 0;
-  NoHandleScope no_handles(visitor->isolate());
 
   // Only reasonable to be called on heap objects.
   ASSERT(IsHeapObject());
 
   // Read the necessary data out of the class before visting the class itself.
   intptr_t class_id = GetClassId();
 
   if (class_id < kNumPredefinedCids) {
     switch (class_id) {
 #define RAW_VISITPOINTERS(clazz)                                               \
@@ skipping 688 matching lines @@
 intptr_t RawUserTag::VisitUserTagPointers(
     RawUserTag* raw_obj, ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return UserTag::InstanceSize();
 }
 
 
 }  // namespace dart