Reland "Merge cellspace into old pointer space"

src/heap/store-buffer.cc

 // 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.
 
 #include <algorithm>
 
 #include "src/v8.h"
 
 #include "src/counters.h"
 #include "src/heap/store-buffer-inl.h"
@@ skipping 519 matching lines @@
   DCHECK(top <= limit_);
   heap_->public_set_store_buffer_top(start_);
   EnsureSpace(top - start_);
   DCHECK(may_move_store_buffer_entries_);
   // Goes through the addresses in the store buffer attempting to remove
   // duplicates.  In the interest of speed this is a lossy operation.  Some
   // duplicates will remain.  We have two hash sets with different hash
   // functions to reduce the number of unnecessary clashes.
   hash_sets_are_empty_ = false;  // Hash sets are in use.
   for (Address* current = start_; current < top; current++) {
-    DCHECK(!heap_->cell_space()->Contains(*current));
     DCHECK(!heap_->code_space()->Contains(*current));
     uintptr_t int_addr = reinterpret_cast<uintptr_t>(*current);
     // Shift out the last bits including any tags.
     int_addr >>= kPointerSizeLog2;
     // The upper part of an address is basically random because of ASLR and OS
     // non-determinism, so we use only the bits within a page for hashing to
     // make v8's behavior (more) deterministic.
     uintptr_t hash_addr =
         int_addr & (Page::kPageAlignmentMask >> kPointerSizeLog2);
     int hash1 = ((hash_addr ^ (hash_addr >> kHashSetLengthLog2)) &
@@ skipping 15 matching lines @@
     }
     old_buffer_is_sorted_ = false;
     old_buffer_is_filtered_ = false;
     *old_top_++ = reinterpret_cast<Address>(int_addr << kPointerSizeLog2);
     DCHECK(old_top_ <= old_limit_);
   }
   heap_->isolate()->counters()->store_buffer_compactions()->Increment();
 }
 }
 }  // namespace v8::internal