[heap] Fine-grained JSArrayBuffer tracking

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 13622d6e046e59adf3ae13b15af36f757eb4e0d9..bff0a7edf7769f2f9f5b8d952c45488ad6d7f145 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -520,6 +520,7 @@ MemoryChunk* MemoryChunk::Initialize(Heap* heap, Address base, size_t size,
   Bitmap::Clear(chunk);
   chunk->set_next_chunk(nullptr);
   chunk->set_prev_chunk(nullptr);
+  chunk->local_tracker_ = nullptr;
 
   DCHECK(OFFSET_OF(MemoryChunk, flags_) == kFlagsOffset);
   DCHECK(OFFSET_OF(MemoryChunk, live_byte_count_) == kLiveBytesOffset);
@@ -1042,6 +1043,11 @@ void MemoryChunk::ReleaseAllocatedMemory() {
   }
   if (old_to_new_slots_ != nullptr) ReleaseOldToNewSlots();
   if (old_to_old_slots_ != nullptr) ReleaseOldToOldSlots();
+
+  if (local_tracker_ != nullptr) {
+    delete local_tracker_;
+    local_tracker_ = nullptr;
+  }
 }
 
 static SlotSet* AllocateSlotSet(size_t size, Address page_start) {