Reland "Remove the weak list of array buffers"

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index 39803b1a2c98db9db392a6a0f360e3ba250c2dd0..6afee2602b28b7bde9cbd93dd71be5f248ae06a2 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -80,12 +80,9 @@ int StaticNewSpaceVisitor<StaticVisitor>::VisitJSArrayBuffer(
     Map* map, HeapObject* object) {
   Heap* heap = map->GetHeap();
 
-  VisitPointers(heap, HeapObject::RawField(
-                          object, JSArrayBuffer::BodyDescriptor::kStartOffset),
-                HeapObject::RawField(object, JSArrayBuffer::kWeakNextOffset));
   VisitPointers(
-      heap, HeapObject::RawField(object,
-                                 JSArrayBuffer::kWeakNextOffset + kPointerSize),
+      heap,
+      HeapObject::RawField(object, JSArrayBuffer::BodyDescriptor::kStartOffset),
       HeapObject::RawField(object, JSArrayBuffer::kSizeWithInternalFields));
   return JSArrayBuffer::kSizeWithInternalFields;
 }
@@ -533,11 +530,10 @@ void StaticMarkingVisitor<StaticVisitor>::VisitJSArrayBuffer(
   StaticVisitor::VisitPointers(
       heap,
       HeapObject::RawField(object, JSArrayBuffer::BodyDescriptor::kStartOffset),
-      HeapObject::RawField(object, JSArrayBuffer::kWeakNextOffset));
-  StaticVisitor::VisitPointers(
-      heap, HeapObject::RawField(object,
-                                 JSArrayBuffer::kWeakNextOffset + kPointerSize),
       HeapObject::RawField(object, JSArrayBuffer::kSizeWithInternalFields));
+  if (!JSArrayBuffer::cast(object)->is_external()) {
+    heap->RegisterLiveArrayBuffer(JSArrayBuffer::cast(object)->backing_store());
+  }
 }