[objects] do not visit ArrayBuffer's backing store

src/heap/store-buffer.cc

 // Copyright 2011 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 "src/heap/store-buffer.h"
 
 #include <algorithm>
 
 #include "src/counters.h"
 #include "src/heap/store-buffer-inl.h"
@@ skipping 481 matching lines @@
                   if (heap_object->IsFixedTypedArrayBase()) {
                     FindPointersToNewSpaceInRegion(
                         obj_address + FixedTypedArrayBase::kBasePointerOffset,
                         obj_address + FixedTypedArrayBase::kHeaderSize,
                         slot_callback);
                   } else if (heap_object->IsBytecodeArray()) {
                     FindPointersToNewSpaceInRegion(
                         obj_address + BytecodeArray::kConstantPoolOffset,
                         obj_address + BytecodeArray::kHeaderSize,
                         slot_callback);
+                  } else if (heap_object->IsJSArrayBuffer()) {
+                    FindPointersToNewSpaceInRegion(
+                        obj_address +
+                            JSArrayBuffer::BodyDescriptor::kStartOffset,
+                        obj_address + JSArrayBuffer::kByteLengthOffset +
+                            kPointerSize,
+                        slot_callback);
+                    FindPointersToNewSpaceInRegion(
+                        obj_address + JSArrayBuffer::kSize,
+                        obj_address + JSArrayBuffer::kSizeWithInternalFields,
+                        slot_callback);
                   } else if (FLAG_unbox_double_fields) {
                     LayoutDescriptorHelper helper(heap_object->map());
                     DCHECK(!helper.all_fields_tagged());
                     for (int offset = start_offset; offset < end_offset;) {
                       int end_of_region_offset;
                       if (helper.IsTagged(offset, end_offset,
                                           &end_of_region_offset)) {
                         FindPointersToNewSpaceInRegion(
                             obj_address + offset,
                             obj_address + end_of_region_offset, slot_callback);
@@ skipping 117 matching lines @@
       DCHECK(start_of_current_page_ != store_buffer_->Top());
       store_buffer_->SetTop(start_of_current_page_);
     }
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace internal
 }  // namespace v8