Remove next field from JSWeakCollection

The GC now stores EphemeronHashTables in a Worklist.

Bug: chromium:844008
Change-Id: I6ad95b3b49484901d75c6fd92b59065c438fcd03
Reviewed-on: https://chromium-review.googlesource.com/1093092
Commit-Queue: Dominik Inführ <dinfuehr@google.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53620}

src/objects-body-descriptors-inl.h

@@ -366,8 +366,7 @@ class PrototypeInfo::BodyDescriptor final : public BodyDescriptorBase {
 
 class JSWeakCollection::BodyDescriptorImpl final : public BodyDescriptorBase {
  public:
-  STATIC_ASSERT(kTableOffset + kPointerSize == kNextOffset);
-  STATIC_ASSERT(kNextOffset + kPointerSize == kSize);
+  STATIC_ASSERT(kTableOffset + kPointerSize == kSize);
 
   static bool IsValidSlot(Map* map, HeapObject* obj, int offset) {
     return IsValidSlotImpl(map, obj, offset);

src/objects/js-collection-inl.h

@@ -18,7 +18,6 @@ ACCESSORS(JSCollectionIterator, table, Object, kTableOffset)
 ACCESSORS(JSCollectionIterator, index, Object, kIndexOffset)
 
 ACCESSORS(JSWeakCollection, table, Object, kTableOffset)
-ACCESSORS(JSWeakCollection, next, Object, kNextOffset)
 
 CAST_ACCESSOR(JSSet)
 CAST_ACCESSOR(JSSetIterator)

src/objects/js-collection.h

@@ -95,9 +95,6 @@ class JSWeakCollection : public JSObject {
   // [table]: the backing hash table mapping keys to values.
   DECL_ACCESSORS(table, Object)
 
-  // [next]: linked list of encountered weak maps during GC.
-  DECL_ACCESSORS(next, Object)
-
   static void Initialize(Handle<JSWeakCollection> collection, Isolate* isolate);
   static void Set(Handle<JSWeakCollection> collection, Handle<Object> key,
                   Handle<Object> value, int32_t hash);
@@ -107,8 +104,7 @@ class JSWeakCollection : public JSObject {
                                     int max_entries);
 
   static const int kTableOffset = JSObject::kHeaderSize;
-  static const int kNextOffset = kTableOffset + kPointerSize;
-  static const int kSize = kNextOffset + kPointerSize;
+  static const int kSize = kTableOffset + kPointerSize;
 
   // Iterates the function object according to the visiting policy.
   class BodyDescriptorImpl;