[objects] do not visit ArrayBuffer's backing store

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f547c8388cf9df637a2436ba64c4bd3342cbef7a..7b54507f2a55ba7605bac7eb700b86d72c4a00fc 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -9676,6 +9676,18 @@ class JSArrayBuffer: public JSObject {
   static const int kSizeWithInternalFields =
       kSize + v8::ArrayBuffer::kInternalFieldCount * kPointerSize;
 
+  class BodyDescriptor {

[jochen (gone - plz use gerrit), 2015/09/14 10:04:36]

instead of having a body description, just add two methods called
JSArrayBufferIterateBody() to JSArrayBuffer (similar to what FixedTypedArrayBase
has)

[fedor.indutny, 2015/09/14 17:08:16]

Acknowledged.

+   public:
+    static const int kStartOffset = JSObject::BodyDescriptor::kStartOffset;
+    static const int kEndOffset = kSizeWithInternalFields - kPointerSize;
+    static const int kSize = kSizeWithInternalFields;
+
+    template <typename StaticVisitor>
+    static inline void IterateBody(Heap* heap, HeapObject* obj);
+
+    static inline void IterateBody(HeapObject* obj, ObjectVisitor* v);
+  };
+
   class IsExternal : public BitField<bool, 1, 1> {};
   class IsNeuterable : public BitField<bool, 2, 1> {};
   class WasNeutered : public BitField<bool, 3, 1> {};