Revert of Merge cellspace into old pointer space

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index c4a037d0bcbb6d96010b13bbb45fa24297323d9d..e01c50b849a0bb99053fa4f0b57f635280ae755c 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -302,6 +302,10 @@
         chunk->size() > static_cast<size_t>(Page::kPageSize) && is_compacting) {
       chunk->SetFlag(MemoryChunk::RESCAN_ON_EVACUATION);
     }
+  } else if (chunk->owner()->identity() == CELL_SPACE ||
+             chunk->scan_on_scavenge()) {
+    chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING);
+    chunk->ClearFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING);
   } else {
     chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING);
     chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING);
@@ -343,6 +347,7 @@
 
 void IncrementalMarking::DeactivateIncrementalWriteBarrier() {
   DeactivateIncrementalWriteBarrierForSpace(heap_->old_space());
+  DeactivateIncrementalWriteBarrierForSpace(heap_->cell_space());
   DeactivateIncrementalWriteBarrierForSpace(heap_->map_space());
   DeactivateIncrementalWriteBarrierForSpace(heap_->code_space());
   DeactivateIncrementalWriteBarrierForSpace(heap_->new_space());
@@ -375,6 +380,7 @@
 
 void IncrementalMarking::ActivateIncrementalWriteBarrier() {
   ActivateIncrementalWriteBarrier(heap_->old_space());
+  ActivateIncrementalWriteBarrier(heap_->cell_space());
   ActivateIncrementalWriteBarrier(heap_->map_space());
   ActivateIncrementalWriteBarrier(heap_->code_space());
   ActivateIncrementalWriteBarrier(heap_->new_space());