Reland of "[heap] Parallel newspace evacuation, semispace copy, and compaction \o/"

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 8271 matching lines @@
 
 class AllocationMemento: public Struct {
  public:
   static const int kAllocationSiteOffset = HeapObject::kHeaderSize;
   static const int kSize = kAllocationSiteOffset + kPointerSize;
 
   DECL_ACCESSORS(allocation_site, Object)
 
   inline bool IsValid();
   inline AllocationSite* GetAllocationSite();
+  inline Address GetAllocationSiteUnchecked();
 
   DECLARE_PRINTER(AllocationMemento)
   DECLARE_VERIFIER(AllocationMemento)
 
   DECLARE_CAST(AllocationMemento)
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationMemento);
 };
 
@@ skipping 2476 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_