Replace slots buffer with remembered set.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 6b98fc1d0ef28c8141924334cd5d833942301004..9ee03ca4d210fa7dc755e1f52b6290d1655bafaa 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -8,7 +8,6 @@
 #include "src/base/platform/platform.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/heap/slot-set.h"
-#include "src/heap/slots-buffer.h"
 #include "src/macro-assembler.h"
 #include "src/msan.h"
 #include "src/snapshot/snapshot.h"
@@ -478,9 +477,9 @@ MemoryChunk* MemoryChunk::Initialize(Heap* heap, Address base, size_t size,
   chunk->flags_ = 0;
   chunk->set_owner(owner);
   chunk->InitializeReservedMemory();
-  chunk->slots_buffer_ = nullptr;
   chunk->old_to_new_slots_ = nullptr;
   chunk->old_to_old_slots_ = nullptr;
+  chunk->typed_old_to_old_slots_ = nullptr;
   chunk->skip_list_ = nullptr;
   chunk->write_barrier_counter_ = kWriteBarrierCounterGranularity;
   chunk->progress_bar_ = 0;
@@ -732,6 +731,10 @@ LargePage* MemoryAllocator::AllocateLargePage(intptr_t object_size,
   MemoryChunk* chunk =
       AllocateChunk(object_size, object_size, executable, owner);
   if (chunk == NULL) return NULL;
+  if (executable && chunk->size() > LargePage::kMaxCodePageSize) {
+    STATIC_ASSERT(LargePage::kMaxCodePageSize <= TypedSlotSet::kMaxOffset);
+    FATAL("Code page is too large.");
+  }
   return LargePage::Initialize(isolate_->heap(), chunk);
 }
 
@@ -932,8 +935,6 @@ bool MemoryAllocator::CommitExecutableMemory(base::VirtualMemory* vm,
 // MemoryChunk implementation
 
 void MemoryChunk::ReleaseAllocatedMemory() {
-  delete slots_buffer_;
-  slots_buffer_ = nullptr;
   delete skip_list_;
   skip_list_ = nullptr;
   delete mutex_;
@@ -972,6 +973,15 @@ void MemoryChunk::ReleaseOldToOldSlots() {
   old_to_old_slots_ = nullptr;
 }
 
+void MemoryChunk::AllocateTypedOldToOldSlots() {
+  DCHECK(nullptr == typed_old_to_old_slots_);
+  typed_old_to_old_slots_ = new TypedSlotSet(address());
+}
+
+void MemoryChunk::ReleaseTypedOldToOldSlots() {
+  delete typed_old_to_old_slots_;
+  typed_old_to_old_slots_ = nullptr;
+}
 // -----------------------------------------------------------------------------
 // PagedSpace implementation