allow disabling of ArrayBuffer neutering

src/objects.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 16347 matching lines @@
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 
 void JSArrayBuffer::Neuter() {
-  DCHECK(is_external());
+  CHECK(is_neuterable());
+  CHECK(is_external());
   set_backing_store(NULL);
   set_byte_length(Smi::FromInt(0));
 }
 
 
 void JSArrayBufferView::NeuterView() {
+  CHECK(JSArrayBuffer::cast(buffer())->is_neuterable());
   set_byte_offset(Smi::FromInt(0));
   set_byte_length(Smi::FromInt(0));
 }
 
 
 void JSDataView::Neuter() {
   NeuterView();
 }
 
 
@@ skipping 110 matching lines @@
   Handle<DependentCode> codes =
       DependentCode::Insert(handle(cell->dependent_code(), info->isolate()),
                             DependentCode::kPropertyCellChangedGroup,
                             info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal