[heap] Introduce a new remembered set for typed pointers from old to new.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index d338eab34108eabdad5c7875b80e53aa51e6063c..e9d2244a0efc84875ee836e99e83bee13be98b37 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -505,6 +505,7 @@ MemoryChunk* MemoryChunk::Initialize(Heap* heap, Address base, size_t size,
   chunk->InitializeReservedMemory();
   chunk->old_to_new_slots_ = nullptr;
   chunk->old_to_old_slots_ = nullptr;
+  chunk->typed_old_to_new_slots_ = nullptr;
   chunk->typed_old_to_old_slots_ = nullptr;
   chunk->skip_list_ = nullptr;
   chunk->write_barrier_counter_ = kWriteBarrierCounterGranularity;
@@ -1037,6 +1038,8 @@ void MemoryChunk::ReleaseAllocatedMemory() {
   }
   if (old_to_new_slots_ != nullptr) ReleaseOldToNewSlots();
   if (old_to_old_slots_ != nullptr) ReleaseOldToOldSlots();
+  if (typed_old_to_new_slots_ != nullptr) ReleaseTypedOldToNewSlots();
+  if (typed_old_to_old_slots_ != nullptr) ReleaseTypedOldToOldSlots();
 }
 
 static SlotSet* AllocateSlotSet(size_t size, Address page_start) {
@@ -1069,6 +1072,16 @@ void MemoryChunk::ReleaseOldToOldSlots() {
   old_to_old_slots_ = nullptr;
 }
 
+void MemoryChunk::AllocateTypedOldToNewSlots() {
+  DCHECK(nullptr == typed_old_to_new_slots_);
+  typed_old_to_new_slots_ = new TypedSlotSet(address());
+}
+
+void MemoryChunk::ReleaseTypedOldToNewSlots() {
+  delete typed_old_to_new_slots_;
+  typed_old_to_new_slots_ = nullptr;
+}
+
 void MemoryChunk::AllocateTypedOldToOldSlots() {
   DCHECK(nullptr == typed_old_to_old_slots_);
   typed_old_to_old_slots_ = new TypedSlotSet(address());