[heap] Black allocation.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 71e2f02bbbc42c7360aee6bac6f53dc55b8c11f4..42e3ccde7f0f686bcb8bcb05ebb8ef3f50ed7fea 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2034,11 +2034,14 @@ void WeakCell::clear() {
 
 void WeakCell::initialize(HeapObject* val) {
   WRITE_FIELD(this, kValueOffset, val);
-  Heap* heap = GetHeap();
   // We just have to execute the generational barrier here because we never
   // mark through a weak cell and collect evacuation candidates when we process
   // all weak cells.
-  heap->RecordWrite(this, kValueOffset, val);
+  WriteBarrierMode mode =
+      Page::FromAddress(this->address())->IsFlagSet(Page::BLACK_PAGE)
+          ? UPDATE_WRITE_BARRIER
+          : UPDATE_WEAK_WRITE_BARRIER;
+  CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kValueOffset, val, mode);
 }