Reland "[heap] Fine-grained JSArrayBuffer tracking"

src/heap/spaces-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_SPACES_INL_H_
 #define V8_HEAP_SPACES_INL_H_
 
 #include "src/heap/incremental-marking.h"
 #include "src/heap/spaces.h"
 #include "src/isolate.h"
@@ skipping 252 matching lines @@
   return page;
 }
 
 // --------------------------------------------------------------------------
 // PagedSpace
 
 template <Page::InitializationMode mode>
 Page* Page::Initialize(Heap* heap, MemoryChunk* chunk, Executability executable,
                        PagedSpace* owner) {
   Page* page = reinterpret_cast<Page*>(chunk);
-  page->mutex_ = new base::Mutex();
   DCHECK(page->area_size() <= kAllocatableMemory);
   DCHECK(chunk->owner() == owner);
 
   owner->IncreaseCapacity(page->area_size());
   heap->incremental_marking()->SetOldSpacePageFlags(chunk);
 
   // Make sure that categories are initialized before freeing the area.
   page->InitializeFreeListCategories();
   // In the case we do not free the memory, we effectively account for the whole
   // page as allocated memory that cannot be used for further allocations.
@@ skipping 430 matching lines @@
     other->allocation_info_.Reset(nullptr, nullptr);
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SPACES_INL_H_